Corrosion Inhibition Capabilities Research Articles

Time dependent anti-corrosion and anti-scaling efficiency of polyepoxysuccinic acid inhibitor in simulated hard water

In this study, the time-dependent performance of a phosphorus-free corrosion and scale inhibitor primarily composed of polyoxyuccinic acid (PESA) and zinc salts was investigated in a laboratory-simulated hard water environment. Long-term static scale inhibition tests and corrosion rotation coupon tests were conducted under two temperature conditions, 45 °C and 80 °C, following established literature standards. Changes in water quality, scale morphology, metal corrosion status, and electrochemical impedance were monitored using calcium ion concentration analysis, optical microscopy imaging, X-ray diffraction (XRD), and electrochemical testing. The study revealed a progressive decline in the corrosion and scale inhibition efficiency of the phosphorus-free inhibitor in simulated hard water with calcium carbonate hardness levels of 300, 400, and 500 mg/L over time. Moreover, higher water hardness accelerated corrosion onset, suggesting that calcium carbonate deposition promotes metal corrosion under the experimental conditions. Density functional theory (DFT) calculations indicated that PESA chemically adsorbs onto both metal and calcite surfaces, underscoring its dual role in corrosion and scale inhibition. These findings underscore the intrinsic corrosion and scale inhibition capabilities of PESA, complementing its synergistic film-forming properties with Zn2+.

An electrochemical and theoretical approach towards the efficient microwave synthesis of imidazolium-based ionic liquids for unprecedented mild steel corrosion inhibition in 0.5 M H2SO4 solution

The inhibition potential of newly synthesized imidazolium-based ionic liquids (IL-1 and IL-2) on mild steel corrosion in a 0.5 M H2SO4 solution has been comprehensively investigated using gravimetric analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy across various temperatures. Gravimetric analysis indicated that the adsorption of these inhibitors adhered to the Langmuir adsorption isotherm. Significantly, IL-2, featuring a longer alkyl chain, demonstrated superior inhibition efficiency (92.51 % at 303 K) compared to IL-1 (88.71 % at 303 K). Potentiodynamic polarization studies revealed a mixed-type inhibitory behavior, impacting both anodic and cathodic reactions. Surface morphological analyses via SEM and EDX confirmed the formation of a protective film on the mild steel surfaces, substantiating the corrosion inhibition capabilities of IL-1 and IL-2. The novelty of this research lies in the application of density functional theory (DFT) using the B3LYP method, which elucidated that the alkyl chain length at the N-3 position in imidazolium cation-based ionic liquids significantly enhances their inhibition potential. This mechanistic insight suggests that these ionic liquids effectively obstruct both anodic and cathodic sites, providing robust corrosion protection in a 0.5 M H2SO4 solution.

Evaluation of N80 Carbon Steel Corrosion in 15 wt.% HCl Using Isatin-hydrazones: A Comprehensive Approach with Chemical, Electrochemical Techniques, and DFTB Calculations

The adverse effects of corrosion on industrial metals, particularly N80 carbon steel under acidic conditions, call for developing effective corrosion inhibitors. Due to their structural and electrical properties, isatine-hydrazones have emerged as possible corrosion inhibitors. This study investigates the corrosion inhibition capabilities of two specific Isatin-hydrazones, (E)-1-octyl-3-(2-(5-oxo-4,4-diphenyl)-4,5-dihydro-1H-imidazol-2-yl)hydrazono)indolin-2-one (OPHIHI) and (E)-3-(2-(5-oxo-4,4-diphenyl)-4,5-dihydro-1H-imidazol-2-yl)hydrazono)indolin-2-one (OIHIHI), on N80 carbon steel in a highly acidic medium. The study assessed the corrosion inhibition efficacy of OIHIHI and OPHIHI using both computational and experimental approaches. Weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy were used in the experiments. In contrast, density functional theory (DFT), molecular dynamics (MD), and tight-binding density functional theory (DFTB) were used in the computational analyses to elucidate the interaction mechanisms between the inhibitors and metal surfaces. The experiment demonstrated that both OPHIHI and OIHIHI effectively reduce corrosion rates in a 15 wt.% HCl solution at 303 K, achieving an inhibition efficiency of 96 % and 92 %, respectively, at an optimal 5 × 10−3 mol/L concentration. These inhibitors were discovered to form protective layers on the N80 carbon steel surface, offering mixed protective qualities (cathodic and anodic protection) with a preponderance of cathodic protection against carbon steel corrosion in 15 wt.% HCl. Computational studies supported the experiment's findings by demonstrating that isatin-hydrazones' superior electronic properties enabled them to form robust covalent bonds with the Fe (110) surface. Based on these results, OPHIHI and OIHIHI could be used as corrosion inhibitors in the oil and gas industry, particularly under highly acidic conditions.

Corrosion Inhibition Performance of Whey Protein-Derived Inhibitors for Low Carbon and Dead Mild Steels in1M Hydrochloric Acid

This research investigates the corrosion inhibition capabilities of BCAA-derived inhibitors for low-carbon steels and dead mild carbon steels with distinct carbon contents when exposed to a 1M HCL solution. The effectiveness of the inhibitors was evaluated by measurements of weight loss and polarization. The study revealed that at a concentration of 10 grams, the weighing method showed that the BCAA inhibitor showed protection effectiveness (87 percent) at 313 K for low carbon steel and (89 percent) effectiveness at 303 K for dead carbon steel. Using a concentration of 15 g, the polarization method showed inhibitory activity of (96 percent) at 313 K for low-carbon steel and (96 percent) at 303 K for dead light carbon steel. These results indicate that the inhibition efficiency is affected by the carbon content. Samples were subjected to scanning electron microscopy (SEM) and optical microscope analysis before and after adding the inhibitor. When examined using FTIR spectroscopy, BCAA showed significant efficiency as a corrosion inhibitor for steel alloys immersed in acidic conditions.

Ab initio exploration of modified carbon nanotubes as potential corrosion inhibitors

In order to develop novel unexplored potential corrosion inhibitors, covalently modified single-walled carbon nanotubes (SWCNT) via benzoic (–PhCOOH) and aniline (–PhNH2) groups are being investigated as corrosion inhibitors for the first time. Utilizing a comprehensive approach, this study employed density functional theory (DFT), Monte Carlo (MC), and molecular dynamics simulations (MD) to assess the adsorption behavior of modified nanotubes as corrosion inhibitors on the Cu(111) surface within a simulated aqueous HCl corrosion medium. The results provided molecular information on the adsorption capability, geometry adsorption centers, and adsorption energies (Eads) of carbon nanotubes on the surface of Cu(111). The adsorption energy values unveiled robust interactions between SWCNT–PhCOOH and SWCNT–PhNH2 inhibitors and the Cu(111) surface, suggesting a highly effective corrosion protection mechanism. The calculated Eads values exhibited notable ranges, spanning from –260.82 to –308.18 kcal/mol for SWCNT–PhCOOH and –220.92 to –261.01 kcal/mol for SWCNT–PhNH2 with the maximum probability values, representing the most favorable adsorption scenarios, determined to be –292.96 and –229.39 kcal/mol, respectively. A key insight from Monte Carlo simulations underscored the inherent spontaneity of the adsorption process, corroborated by the consistently negative Eads values. These findings collectively underscore the substantial affinity of the inhibitors to the copper surface, contributing to a deeper comprehension of their corrosion inhibition capabilities.

Batatas lam leaf extract as a biodegradable corrosion inhibitor for copper in 0.5 M H2SO4 solution

In this study, the Ipomoea Batatas Lam Leaf Extract (IBLE) was obtained through a pure water decoction process. To investigate the corrosion inhibition capabilities of Ipomoea Batatas Lam Leaf Extract (IBLE), a comprehensive approach encompassing electrochemical techniques, X-ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), and theoretical calculations has been employed. The electrochemical test results demonstrate a remarkable corrosion inhibition efficiency of up to 96.7% when utilizing an 800 mg/L concentration of IBLE. As the temperature increases, IBLE can still maintain a high standard of anti-corrosion performance and the corrosion inhibition performance can even maintain more than 95% at a temperature of 315 K. Polarization curve test results demonstrate that IBLE belongs to the mixed corrosion inhibitor, which restrains both anode and cathode reactions of copper electrodes in 0.5 M H2SO4 medium. The EIS test shows that the effective inhibition of the charge transfer process by the adsorption of IBLE onto the interface of copper, as the concentration of IBLE increases, there is a notable and significant rise in it, thus showing a great corrosion inhibition property. The surface morphology test shows that the erosion of the copper surface is significantly suppressed after IBLE adsorbing on the copper surface. XPS test reveals that the active ingredients in IBLE can generate Cu–N bonds on the copper surface, producing chemisorption. Theoretical calculation results reveal that the active ingredients of IBLE have great corrosion suppression property.

Review on the Encapsulation, Microencapsulation, and Nano- Encapsulation: Synthesis and Applications in the Process Industry for Corrosion Inhibition

Background: Surfaces of materials often corrode and deteriorate due to environmental conditions. There are various widely used methods of reducing corrosion rates to increase the lifetime of materials and equipment. Recently, there has been a growth in the use of nanotechnology to protect metals against corrosion. The application of nano-encapsulation techniques in the process industry is one of the important eras of nanotechnology. This review paper focuses on encapsulation, microencapsulation, and nano-encapsulation methods, emphasizing nanoencapsulation applications as corrosion inhibitions in the process industry. Methods: Materials based on the self-healing mechanism were used in advanced applications such as structures, batteries, and coatings. These technologies may be studied in two ways: compounds with intrinsic self-healing properties and extrinsic self-healing materials with additives such as microcapsules filled with healing agents. Nano-coatings have advantages, like accelerated ground hardness, adhesive energy, long-time period and/or high-temperature corrosion resistance, tribological residence enhancement, etc. Nano-coatings can also be carried out in thinner and smoother layers, considering flexibility, accelerated performance, decreased fuel costs, and smaller carbon footprints, as well as occasional maintenance. The review of corrosion characteristics of polymeric nanocomposite material was discussed in this paper. Results: This review paper presents an updated overview summarizing the latest advances in the various micro/nanocarriers used for self-healing corrosion protective coatings. Conclusion: With this information, the investigators will be able to modify the structure of the inhibitor to get the necessary corrosion inhibition capabilities. The need for a physical examination is rising as a result.

Development of a Machine Learning Model to Predict the Corrosion Inhibition Ability of Benzimidazole Compounds

The purpose of this study is to use quantitative structure-property relationship (QSPR)-based machine learning (ML) to examine the corrosion inhibition capabilities of benzimidazole compounds. The primary difficulty in ML development is creating a model with a high degree of precision so that the predictions are correct and pertinent to the material's actual attributes. We assess the comparison between the extra trees regressor (EXT) as an ensemble model and the decision tree regressor (DT) as a basic model. It was discovered that the EXT model had better predictive performance in predicting the corrosion inhibition performance of benzimidazole compounds based on the coefficient of determination (R2) and root mean square error (RMSE) metrics compared DT model. This method provides a fresh viewpoint on the capacity of ML models to forecast potent corrosion inhibitors.

Synthesis, surface activity, and corrosion inhibition capabilities of new non-ionic gemini surfactants

Several environmentally acceptable non-ionic gemini surfactants are synthesized in this work using natural sources, including polyethenoxy di-dodecanoate (GSC12), polyethenoxy di-hexadecanoate (GSC16), and polyethenoxy di-octadecenoate (GSC18). The produced surfactants are confirmed by spectrum studies using FT-IR, 1HNMR, and 13CNMR. It explored and examined how the length of the hydrocarbon chain affected essential properties like foaming and emulsifying abilities. Surface tension examinations are used to assess the surface activity of the examined gemini surfactants. The lower value of critical micelle concentrations (0.381 × 10−4M) is detected for GSC18. Their spontaneous character is shown by the negative values of the free energy of adsorption (ΔGads) and micellization (ΔGmic) which arranged in the order GSC18 > GSC16 > GSC12. Based on theoretical, weight loss, and electrochemical investigations, these novel surfactants were investigated for their possible use in inhibiting carbon steel from corroding in 1 M HCl. Measuring results show that GSC18 inhibits corrosion in carbon steel by 95.4%. The isotherm of adsorption evaluated for the investigated inhibitors and their behavior obeys Langmuir isotherm.

Assessment of Hydrazone Derivatives for Enhanced Steel Corrosion Resistance in 15 wt.% HCl Environments: A Dual Experimental and Theoretical Perspective.

This study evaluates the corrosion inhibition capabilities of two novel hydrazone derivatives, (E)-2-(5-methoxy-2-methyl-1H-indol-3-yl)-N'-(4-methylbenzylidene)acetohydrazide (MeHDZ) and (E)-N'-benzylidene-2-(5-methoxy-2-methyl-1H-indol-3-yl)acetohydrazide (HHDZ), on carbon steel in a 15 wt.% HCl solution. A comprehensive suite of analytical techniques, including gravimetric analysis, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM), demonstrates their significant inhibition efficiency. At an optimal concentration of 5 × 10-3 mol/L, MeHDZ and HHDZ achieve remarkable inhibition efficiencies of 98% and 94%, respectively. EIS measurements reveal a dramatic reduction in effective double-layer capacitance (from 236.2 to 52.8 and 75.3 µF/cm2), strongly suggesting inhibitor adsorption on the steel surface. This effect is further corroborated by an increase in polarization resistance and a significant decrease in corrosion current density at optimal concentrations. Moreover, these inhibitors demonstrate sustained corrosion mitigation over extended exposure durations and maintain effectiveness even under elevated temperatures, highlighting their potential for diverse operational conditions. The adsorption process of these inhibitors aligns well with the Langmuir adsorption isotherm, implying physicochemical interactions at the carbon steel surface. Density functional tight-binding (DFTB) calculations and molecular dynamics simulations provide insights into the inhibitor-surface interaction mechanism, further elucidating the potential of these hydrazone derivatives as highly effective corrosion inhibitors in acidic environments.

Unveiling the influence of furan and thiophene on the corrosion inhibition capabilities of novel hydrazones derivatives in carbon steel/HCl interface: A dual experimental-theoretical study

The use of corrosion inhibitors is a critical measure in the preservation of metals. In this research, the performance of two hydrazone derivatives, N′-[(E)-furan-2-ylmethylidene]− 2-(6-methoxynaphthalen-2-yl)propanehydrazide (NFH) and 2-(6-methoxynaphthalen-2-yl)-N′-[(E)-thiophen-2-ylmethylidene]propanehydrazide (NTH), was evaluated for their ability to inhibit corrosion of carbon steel in a 1.0 mol/L HCl solution. Electrochemical Impedance Spectroscopy (EIS), Potentiodynamic Polarization (PDP), and Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEM-EDX) were employed to assess the compounds' inhibition performance. The experimental results demonstrated that the efficiency of the inhibitors improved with increasing concentration. NFH reached a 90% threshold, while NTH peaked at 93%. This superior performance of NTH was attributed to its thiophene group, in contrast to the furan moiety in NFH. PDP data revealed that both compounds acted as mixed inhibitors, inhibiting both anodic and cathodic reactions. The EIS results indicated a significant increase in polarization resistance, accompanied by a reduction in the values of effective double-layer capacitance, due to the adsorption of inhibitor molecules. The adsorption of inhibitor molecules conformed to the Langmuir isotherm model, suggesting a combined physicochemical mode of interactions with the carbon steel, which was corroborated by potential of zero charge (PZC) analysis. SEM-EDX analysis confirmed the thiazole derivatives' capacity to protect the metal against corrosion. Quantum Chemical Calculations (QCCs) along with Molecular Dynamics (MD) simulations elucidated the reactivity descriptors and the optimal adsorption configurations on the Fe(110) surface. This exploration underscores the significance of the thiophene moiety in enhancing the adsorptive and corrosion inhibitory properties of the hydrazones, thus providing strategic insights for their future refinement and application.

Corrosion Inhibition of Mild Steel in HCl Solution Using MPO: Experimental and Theoretical Insights

Corrosion is a pervasive challenge in various industrial applications, particularly in acidic environments. This comprehensive study delves into the effectiveness of 2-methyl-4-propyl-1,3-oxathiane (MPO) as a corrosion inhibitor for mild steel exposed to hydrochloric acid (HCl) solutions. The investigation employs weight loss techniques to assess the inhibitor's performance over varying durations (ranging from 1 to 48 hours) and concentrations (0.1 to 1 mM). At a concentration of 0.5 mM, the inhibitor demonstrates impressive inhibitory efficiency, ranging from 87.6% at 303 K to 92.9% at 333 K during a 5-hour exposure period. Additionally, the impact of temperature on the corrosion inhibition process is examined at temperatures of 303, 313, 323, and 333 K, showing substantial inhibition efficiencies. Quantum chemical calculations using Density Functional Theory (DFT) methods elucidate the molecular interactions between MPO and the metal surface. Notably, the analysis of EHOMO (Highest Occupied Molecular Orbital Energy), ELUMO (Lowest Unoccupied Molecular Orbital Energy), Egap (Energy Gap), total hardness (η), electronegativity (χ), and electron fraction transition atom (ΔN) reveals valuable insights into MPO's corrosion inhibition capabilities. The outcomes underscore MPO's potential as an effective corrosion inhibitor for mild steel in HCl environments, laying the groundwork for more efficient corrosion prevention strategies in industrial settings.

Study of the Electrochemical Behavior of Concrete‐Coated Steel in 1 M Sulfuric Acid Using an Extract of Diplotaxis simplex L.

AbstractThis study aimed to evaluate Diplotaxis simplex (DS) extract as an eco‐friendly corrosion inhibitor in a harsh 1 M H2SO4 solution, focusing on its effectiveness against both general and localized concrete corrosion. Electrochemical methods, including linear polarization, were employed to assess the DS extract‘s corrosion inhibition capabilities. The results demonstrate DS extract's exceptional inhibitory properties, with inhibition efficiency increasing with higher concentrations. This enhanced performance is attributed to the extract‘s phenolic compounds, containing nitrogen and oxygen heteroatoms with π‐electrons. Notably, sinapic acid, a known corrosion inhibitor for steel in acidic environments, was found in DS extract.Electrochemical Impedance Spectroscopy (EIS) further validated the findings, showing an 84.22 % inhibition efficiency at a DS extract concentration of 300 ppm. Scanning Electron Microscopy (SEM) analysis of the electrode surface confirmed the formation of a protective layer, supporting DS extract's potential as a concrete corrosion inhibitor in aggressive environments.In summary, this study highlights DS extract's potent corrosion inhibition properties, making it a promising candidate for safeguarding concrete structures against corrosion. These findings offer exciting prospects for sustainable corrosion protection strategies in challenging settings.

Selenocyanates and selenotetrazoles derivatives: A detailed experimental and theoretical evaluation as corrosion inhibitors for mild steel in aggressive environment

This work presents the selenocyanates ESCA and ESCP and their derivatives selenotetrazoles ETSP and ETSA, which were synthesized with good to excellent yields. The compounds were designed and studied as corrosion inhibitors for mild steel in 1 mol L−1 HCl. Weight loss experiments showed that ESCP, ESCA, ETSP, and ETSA mitigate corrosion from 81.1 to 92.8 % at 2.00 mmol L−1 (298 K). At higher temperatures (338 K), those values go from 85 to 95 %. EIS shows that the mechanism of corrosion is by charge transfer and that the organic compounds act by adsorbing in the surface and blocking the active sites. Polarization curves and EFM prove that the corrosion density is significantly lower in the presence of the four molecules, and they all are mixed-type corrosion inhibitors. AFM depicted the topography of the metallic surface and point to the formation of an adsorbed protective film. Atomistic simulations using ab initio DFT were employed to investigate the interactions between selenocyanates and selenotetrazoles with an Fe(110) metal surface, elucidating the adsorption geometries and electronic properties. Our findings demonstrated that the adsorption geometries and resultant bonds, particularly those involving oxygen (O), selenium (Se), and nitrogen (N) atoms, critically influence the corrosion inhibition capabilities of these molecules. ESCA and ETSP showed bond rupture of C-Se while ESCP had no covalent bonding with iron atoms, which can explain their lower inhibitive performance compared to more energetically stable ETSA.

Evaluation on corrosion mitigation capabilities of nitrogen doped carbon dots as corrosion inhibitors for mild steel in descaling solution

The article represents a mechanistic and detailed evaluation of synthesized novel nitrogen doped carbon dots (N-CDs) as corrosion inhibitors for mild steel in 15 % HCl solution. The investigation reflects the synergistic adsorption and corrosion inhibition capabilities of N-CDs. The investigation reflects that the N-CDs display efficient corrosion inhibition of 93.09 % efficiency for a dosage of 350 ppm. The N-CDs adsorb upon the metallic substrate surface to generate a protective layer at the metal solution interface and thereby protect it from the aggressive electrolyte. The electrochemical analyses confirm that the N-CDs behave as mixed type corrosion inhibitors and protect both anodic and cathodic sites of corrosion. The protective film was chemically analyzed through XPS analysis which confirms the inorganic/organic, hybrid nature of the protective film.

Mild steel corrosion inhibition comparison between indole-5-carboxylic acid and benzofuran-5-carboxylic acid: An integrated experimental and theoretical study

Corrosion inhibition capabilities of Indole-5-carboxylic acid (IC) and Benzofuran-5-carboxylic acid (BC) on mild steel have been comprehensively investigated using various techniques, including Potentiodynamic Polarization Measurement (PPM), electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SEM). The results from polarization tests demonstrated that both IC and BC effectively reduced the corrosion current densities of both cathodic and anodic reactions occurring on the metal surface. Through EIS analysis, it was observed that the inhibitory efficacy of IC and BC increased with higher inhibitor concentrations. At a temperature of 30°C, the solution containing 10−2M IC and 10−2M BC exhibited the maximum inhibitory efficiency, with IC achieving 92.19% and BC achieving 75.00%. The adsorption behavior of the inhibitors was found to follow the Langmuir isotherm, suggesting a monolayer adsorption process. Additionally, quantum chemical calculations were carried out to assess the molecular parameters of the inhibitors thoroughly. These calculations consistently indicated that IC exhibited superior inhibitory properties compared to BC. Furthermore, molecular dynamics simulations were employed to gain insights into the optimal adsorption configuration of the inhibitors on the Fe(110) surface. The results revealed that IC possessed a higher binding energy with the Fe(110) surface, confirming its superior ability to inhibit steel corrosion compared to BC.

Effect of three penicillin-based as corrosion inhibitors on Q235 steel in hydrochloric acid

This study investigated the effects of three penicillin-based inhibitors (carbenicillin sodium (CS), ampicillin sodium (AS), and sulbenicillin sodium (SS)) on corrosion inhibition for Q235 steel in 1 M hydrochloric acid solution. The findings revealed that all three inhibitors demonstrated remarkable effectiveness in inhibiting corrosion. Furthermore, the study established a clear correlation between the concentration of these inhibitors and their corrosion inhibition capabilities, indicating that higher concentrations led to enhanced inhibition. Conversely, as the temperature increased, the corrosion inhibition performance of the inhibitors decreased. The most substantial corrosion inhibition efficiencies were achieved at an optimal concentration of 8 mM, with CS reaching 96.82%, AS achieving 96.32%, and SS attaining 94.28% efficiency, respectively. Additionally, the study identified a mixed-type corrosion inhibition mechanism employed by these inhibitors, indicating their involvement in both anodic and cathodic corrosion processes. Moreover, the inhibitors adhered to the Langmuir adsorption isotherm when interacting with the metal surface.

Microscale Corrosion Inhibition Behavior of Four Corrosion Inhibitors (BTA, MBI, MBT, and MBO) on Archeological Silver Artifacts Based on Scanning Electrochemical Cell Microscopy.

The problem of corrosion-induced discoloration and embrittlement in silverware is a significant concern for the long-term preservation of excavated archeological silver artifacts, even after thermal restoration. The key to addressing this issue lies in the meticulous selection and evaluation of corrosion inhibitors that possess targeted corrosion inhibition capabilities. This study focuses on the evaluation of corrosion inhibitors for archeological silver artifacts using scanning electrochemical cell microscopy (SECCM) and X-ray photoelectron spectroscopy (XPS). The researchers aimed to compare the inhibition effects of four corrosion inhibitors [1,2,3-benzotriazole (BTA), 2-mercaptobenzimidazole (MBI), 2-mercaptobenzothiazole (MBT), and 2-mercaptobenzoxazole (MBO)] on a simulated Ag-Cu alloy sample and understand their mechanisms. The results showed that MBT exhibited better corrosion inhibition for microstructural regions with higher silver content due to its ability to form stable chelation structures with Ag(I). MBO exhibited better corrosion inhibition for microstructural regions with higher copper content due to its strong affinity with Cu(I). The targeted corrosion inhibition ability for the β-phase was ranked as MBO > BTA ≈ MBI > MBT, while for the α-phase the ranking was MBT > MBO > MBI > BTA. The study demonstrated the feasibility and capabilities of SECCM in the targeted screening of corrosion inhibitors for different compositions and microstructural regions in archeological metal artifacts. This study highlights the potential of SECCM in corrosion inhibitor research for archeological metal artifacts and wider applications in metal material corrosion protection.

Evaluating the adsorption and corrosion inhibition capabilities of Pyridinium - P - Toluene Sulphonate on MS in 1 M HCl medium: An experimental and theoretical study

Mild steel (MS) is a reasonably priced construction alloy that can be utilized for a broad array of tasks in a variety of settings, Viz. mild acidic conditions with minor precautions. The quantitative assessment of MS's corrosion behavior in 1 M acidic (HCl) medium, at temperatures between (298–328 K), both in the presence and absence of the inhibitor Pyridinium - P - Toluene Sulphonate (PPTS), was examined by utilizing weight loss (WL) measurement, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) methods. All these approaches were accompanied by surface characterization approaches utilizing scanning electron microscope (SEM) and atomic force microscope (AFM). This analysis is unique in that it uses WL approaches for each of the three indices to investigate the efficacy of a novel, reasonably priced, non-toxic, and environmentally friendly corrosion inhibitor (PPTS) for MS under 1 M acidic conditions. Significant corrosion resistance was achieved with the introduction of the tested inhibitor, and PPTS demonstrated a very promising inhibition efficiency (IE %) of 93.28% at 2 × 10−3 ppm at 298 K using the WL technique. The fluctuation in the kinetic and thermodynamic characteristics suggested that the PPTS was physically adsorbing to the MS, and its mixed-type inhibitive activity delayed both the cathodic as well as anodic processes following the Langmuir isotherm model. Furthermore, on the MS surface, the deposition of a highly protective layer was revealed by contact angle measurements. The implementation of quantum calculations (QC) and Monte Carlo simulation (MC) models produced insightful findings, and the outcomes were consistent with the outcomes of the experimental verdicts, indicating the possible corrosion inhibition characteristic of PPTS for MS in an HCl media.

Corrosion inhibition capabilities of aluminium thin films on AZ31 magnesium alloy

Al coating of varying thicknesses in the 50 to 200 nm range was coated on AZ31 Mg alloys to improve its corrosion capabilities. The thermal evaporation method is used for coating AZ31 Mg alloys. GIXRD, SEM, AFM and XEDS studied the structure, microstructure, and chemical analysis. GIXRD studies showed an amorphous thin film on the surface. AFM showed that the surface roughness increases with the coating thickness. Corrosion studies were done by electrochemical analysis in 3.5 wt-% NaCl environment. The Al coating has improved the corrosion resistance of the AZ31 alloy to the best with the lowest corrosion rate 0.07 mmpy, with the corrosion current density and corrosion potential of 0.32 × 10−5 A/cm2 and −1.17 V, respectively.