Anti-corrosion Mechanism Research Articles

Research on Anti-corrosion Mechanism and Technology of Oil Pipeline

Research on Anti-corrosion Mechanism and Technology of Oil Pipeline

Stability Mechanism of Laser-induced Fluorinated Super-hydrophobic Coating in Alkaline Solution

Great attention has been focused on super-hydrophobic surfaces due to their fantastic applications. Fluoride chemicals are widely used to fabricate super-hydrophobic surfaces due to their convenience, simplicity, and high efficiency. Previous research has made extensively efforts on corrosion resistance of fluorinated super-hydrophobic surfaces in corrosive media. Nevertheless, rare papers focused on the underlying reasons of anticorrosion property and stability mechanism on the fluorinated super-hydrophobic coatings in alkaline solution. Therefore, this work aims to reveal these mechanisms of fluorinated super-hydrophobic copper samples in strong alkaline solution (pH 13). Through the characterization of surface wettability and surface morphology, the laser-induced super-hydrophobic surface retained excellent stability after soaking in alkaline solution for 4 h. Through measurement of chemical compositions, the anticorrosion mechanism and stability mechanism of the fluorinated super-hydrophobic surface were proposed. Importantly, the hydroxyl ion (OH−) can further promote the hydrolysis reaction to improve the density and bonding strength of the fluoride molecules. Finally, the electrochemical experiments (PDP and EIS tests) were conducted to validate the rationality of our proposed conclusions.

Environmentally friendly synthesis of oxygen-doped g-C3N4 nanosheets for enhancing photocatalytic corrosion resistance of carbon steel

Utilization of an inexpensive photocatalyst replacing the active metal in the traditional sacrificial anode protection method is not only low in energy consumption but also clean and friendly to the environment. In this work, a composite epoxy (EP) coating with the addition of oxygen-doped g-C3N4 (OCNNS) was prepared for improving the corrosion resistance of Q235 carbon blocks. A series of characterizations verified that the synthesized OCCNS nanosheets exhibit high specific surface area and better water dispersibility. In addition, the corrosion resistance of coated samples was investigated by open-circuit potentials (OCP), electrical polarization curves and electrochemical impedance spectra (EIS), and the results showed that the optimal corrosion resistance was achieved with the addition of OCNNS-2 photocatalyst/coating with a maximum impedance radius about 6000 kΩ cm−2. Finally, the photocatalytic anticorrosion mechanism of OCNNS photocatalyst/coating was proposed and discussed.

A self-healing corrosion protection coating with graphene oxide carrying 8-hydroxyquinoline doped in layered double hydroxide on a micro-arc oxidation coating

The fabrication of remarkable self-healing coatings is the key to achieving excellent anti-corrosion of magnesium (Mg) alloys. In this research, 8-hydroxyquinoline@graphene oxide (8-HQ@GO) composite was successfully synthesized through ring-opening reaction and a micro-arc oxidation (MAO) coating was grown on AZ31 beforehand. Afterwards, the 8-HQ@GO composite was doped into the layered double hydroxides (LDHs) sheet by hydrothermal chemical transformation based on the MAO coating without introducing any kind of salts. The incorporation of 8-HQ@GO composite and Mg-Al LDHs sheets can distinctly boost the corrosion resistance of AZ31 alloy. The self-healing performance and the anti-corrosion mechanism of MAO-LDHs/HG coating are discussed.

A new synergetic system based on triboelectric nanogenerator and corrosion inhibitor for enhanced anticorrosion performance

A new synergetic anticorrosion system was constructed via combining a self-powered cathodic protection based on triboelectric nanogenerator (TENG) and a green corrosion inhibitor of zinc gluconate (ZnG). Wind-driven TENG with a sandwich-like structure was designed, exhibiting high output performance with the peak values of short circuit current, output voltage and corresponding power reaching about 155 μA, 402 V and 13.5 mW, respectively, under a wind speed of 10 m/s. With the assistance of TENG, the migration of corrosion inhibitor can be accelerated and the formation of the protective layer becomes faster due to the driving force of electric field. The shielding effect of protective layer in turn improves the cathodic protection of TENG. The immersion experiment and electrochemical measurements including Tafel polarization curves and EIS were taken to evaluate the performance of synergetic anticorrosion system. FESEM and EDS measurements were performed to analyze the morphology and composition of the protective layer and confirm the mechanism of synergetic anticorrosion. This work expands the application of TENG in the anticorrosion field and proposes a new thought of synergetic anticorrosion method.

Effect of polypyrrole nanostructures on the anti-corrosion performance of polypyrrole/polyvinyl butyral/carbon black coatings

Polypyrrole nanoparticles (PPy NPs), nanorods (NRs), and nanotubes (NTs) are prepared by a green chemical oxidation method using H2O2 as an oxidant under UV irradiation. The anti-corrosion coatings are prepared by hybridizing different nanostructured PPy, polyvinyl butyral, and carbon black for protecting zinc metal. The effect of the content of PPy on corrosion-resistant of the coatings is investigated, and the influence of the PPy nanostructures on the anti-corrosion performance of the coatings is also investigated by the electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. It is found that the composite coatings with nano-PPy have obvious anticorrosive performance, and the corrosion resistance is evidently enhanced with the increase of the content of PPy nanostructures. It is further found that the coatings containing PPy NPs have the best corrosion resistance. The possible anti-corrosion mechanism of the anti-corrosion coatings is proposed.

The role of anticorrosive polymer coatings for the protection of metallic surface

Abstract Research on corrosion-resistant polymer coatings has attracted scientists in both academia and industry to prevent corrosion-related damage in modern industrial equipment and to extend the working life of industrial metallic surfaces. To achieve realistic applications, diverse methodologies have been designed to magnify the anticorrosion efficiency of these coatings. The current review describes the conventional and advanced methods utilized for the synthesis of corrosion-resistant polymer coatings. The main intent of this review article is to provide an overview of the design and preparation of anticorrosive polymer coatings with important examples. The promising anticorrosion applications of self-healing polymer coatings for metallic materials and alloys are highlighted. The advantage of a superhydrophobic surface to prevent the corrosion of the materials is discussed. A brief discussion over the anticorrosion mechanism of conducting polymer coatings is also provided. Finally, the current challenges and future perspectives to prolong the anticorrosion performance of these coatings are also addressed.

Synergetic Anticorrosion Mechanism of Main Constituents in Chinese Yam Peel for Copper in Artificial Seawater.

Active constituents of Chinese yam peel (CYPE), namely, diosgenin (DOG), batatasin-I (BTS-I), batatasin-III (BTS-III), and yam polysaccharide (Y-PS), were extracted via an ultrasonic soaking strategy. The synergetic anticorrosion mechanism among these compounds for copper in artificial seawater (ASW) was clarified by gravimetric measurements, electrochemical evaluations, surface analyses, quantum chemical calculations under a dominant solvent model, and molecular dynamics (MD) simulations. The results of weight loss revealed that CYPE strongly inhibited the corrosion of copper in ASW, and the elevating temperature boosted the anticorrosion efficacy of CYPE. The inhibition efficiency could attain 96.33% with 900 mg/L CYPE in ASW at 298 K due to effective adsorption. CYPE simultaneously suppressed the anodic and cathodic reactions for copper in ASW, which could be categorized as the mixed-type corrosion inhibitor with the predominant anodic effect. Similar electrochemical kinetics was evidenced by electrochemical frequency modulation (EFM). Electrochemical impedance spectroscopy (EIS) indicated that CYPE prominently increased the charge-transfer resistance at the copper/electrolyte interface without altering the corrosion mechanism. Extending the immersion time was also conducive for CYPE to further minimize the corrosion of copper in ASW, which was demonstrated by the time-course polarization, EIS, and EFM tests. Owing to the adsorption of CYPE, the copper surface was well-protected and showed reduced wettability and limited variation of roughness. From the outcomes of quantum chemical calculations, global and local reactive descriptors of DOG implied the cross-linked deposition of actually formed dioscin on the copper surface; otherwise, those of BTS-I/-III showed the propensity for parallel adsorption, which could chemically anchor on the voids uncovered by dioscin and thereby synergistically inhibit the corrosion process. The adsorption orientations of DOG, BTS-I, and BTS-III were also consolidated by MD simulations. The findings of this study might be beneficial to inspire the development of eco-friendly corrosion inhibitors from plant wastes for copper in marine environments.

Insight on the corrosion inhibition performance of psidium guajava linn leaves extract

This work multi-angle explored the anti-corrosion nature and mechanism of psidium guajava linn leaves extract for copper in H2SO4 environment.In this study, we used a simple and eco-friendly extraction way to acquire psidium guajava linn leaves extract (PGLLE). Fourier Transform infrared spectroscopy (FTIR) was executed to determine the active functional groups in PGLLE. Quantum chemical calculations effectively forecast the anti-corrosion characteristic of the four active substances in PGLLE. The results of molecular dynamics simulation predicted the stabilized adsorption configurations of the four substances in PGLLE on the Cu (111). Surface topography analysis can intuitively demonstrate that PGLLE effectually inhibits Cu corrosion. The data of electrochemical experiments show that the anti-corrosion capacity of PGLLE increases with the increase of the concentration in a certain interval. As the temperature hoists at definite temperature range, PGLLE can still be efficaciously adsorbed at the Cu surface, showing high-quality corrosion inhibition capabilities. Psidium guajava linn leaves can exist widely in nature, so it has great economic value as the inhibitor. Besides, PGLLE basically does not pollute the ecosystem when used as inhibitors.

Adsorption and anticorrosion mechanism of glucose-based functionalized carbon dots for copper in neutral solution

BackgroundThis work aims at developing some environmental-friendly corrosion inhibitors for copper in neutral solution. MethodsA glucose-based functionalized carbon dots (FCDs) was synthesized through a facile one-pot hydrothermal method. The inhibition performance of FCDs was firstly researched systematically on copper in neutral 3.5 wt% NaCl solution by potentiodynamic polarization curves, electrochemical impedance spectroscopy and scanning vibrating electrode technique. The above electrochemical results show that FCDs is an effective corrosion inhibitor for copper in neutral solution, and its optimal corrosion inhibition efficiency exceeds to 88% at 70 ppm. The protective performance of FCDs depends on the coverage of adsorption film on copper surface. Its adsorption isotherm is in accordance with Langmuir adsorption model, involving both physisorption and chemisorption. Atomic force-distance curve directly quantifies the adhesion force between the adsorption film and copper surface. Significant findsThe adsorption and anticorrosion mechanism of FCDs in neutral solution is proposed, which could provide theoretical guidance for design and synthesis of nanomaterial corrosion inhibitor.

Innovative Silver-Based Capping System for Mesoporous Silica Nanocarriers Able to Exploit a Twofold Anticorrosive Mechanism in Composite Polymer Coatings: Tailoring Benzotriazole Release and Capturing Chloride Ions.

In this work, engineered stimuli-responsive mesoporous silica nanoparticles (MSNs) were developed and exploited in polymer coatings as multifunctional carriers of a typical corrosion inhibitor, benzotriazole (BTA). In detail, a new capping system based on a BTA–silver coordination complex, able to dissolve in acid and alkaline conditions and to simultaneously tailor the BTA release and the capture of chloride ions, was properly designed and realized. Acrylic coatings embedding the engineered MSNs were deposited onto iron rebar samples and tested for their protective capability in acid and alkaline environments. Results highlighted the high potential of the proposed system for the protection of metals, due to the synergistic effect of the mesoporous structure and the capping system, which guaranteed both the sequestration of chloride ions and the on-demand release of the effective amount of anticorrosive agents able to ensure the enhanced protection of the substrate.

Insight into Anticorrosion Mechanism of Ampicillin on Mild Steel in Acidic Environment: A Combined Experimental and Theoretical Approach

The corrosion inhibition of mild carbon steels in an acidic environment by using ampicillin (AMP) has been evaluated based on experimental and quantum chemistry techniques. The experimental results indicate that the inhibition efficiency goes up at higher AMP concentration. The highest inhibition efficiency reaches 84.9% for polarization measurement and 90.1% for electrochemical impedance spectroscopy with the inhibitor of concentration 100 ppm at 298 K. The surface characteristics (SEM) also reconfirm the steel corrosion inhibition ability of AMP. Some important chemical factors such as EHOMO (highest occupied molecular orbital energy), ELUMO (lowest unoccupied molecular orbital energy), ΔEL−H (energy gap), and Fukui functions were calculated based on the optimized configuration of AMP at the theoretical level of B3LYP/6-31+G(d,p). Moreover, Monte Carlo and molecular dynamics simulations were used to analyze the absorption behavior of inhibitor on the surface of Fe(110), which supplies the mechanism of inhibition corrosion processes. The obtained results showed that AMP is considered to be a potential corrosion inhibitor for mild steel in 1M HCl medium. Moreover, the protonated state of AMP plays an important role in the protection of Fe surface against the corrosive process.

Interaction between Yb2O3-Y2O3 co-stabilized ZrO2 ceramic powder and molten silicate deposition, and its implication on thermal barrier coating application

Currently molten silicate deposition in thermal barrier coatings application is an ongoing challenge for material scientists. To some extent, it has already been the greatest weakness of traditional yttria partially stabilized zirconia material. Thus new material candidates and strategies that can mitigate calcium‑magnesium-alumina-silicate corrosion are urgently needed. To this end, a ‘model’ experiment involving high-temperature interactions between Yb 2 O 3 -Y 2 O 3 co-stabilized ZrO 2 ceramic powders and CMAS glass was conducted in this study. This study proposes a simple but effective methodology for comparing the transport behavior of Yb 3+ and Y 3+ during the interaction which provides further understanding of the anti-corrosion mechanism. After exposure at 1300 °C for various durations, less degradation was observed in YbYSZ samples. Further analyses ascribed the enhancement of CMAS-mitigating capability to the low diffusion rate of Yb 3+ , which was highly beneficial for maintaining the microstructure and phase stability. Additionally, the potential of YbYSZ as a CMAS-resistant material for TBCs was supported by the dramatically improved thermo-physical and mechanical properties of YbYSZ compared to those of conventional YSZ. • A simple but effective method for comparing the transport behavior was proposed. • The Yb 2 O 3 and Y 2 O 3 co-stabilized ZrO 2 shows enhanced CMAS resistance. • YbYSZ shows better thermo-physical properties as compared with traditional YSZ.

Luffa cylindrica roem leaves extract as the environment-friendly inhibitor for copper in sulfuric acid environment

This work mainly explored the anti-corrosion nature and mechanism of Luffa cylindrica roem leaves extract for Cu in H2SO4 environment. We used a green and environmentally-friendly pure water extraction method to obtain Luffa cylindrica roem leaves extract (LCRLE). We used FTIR to test the corresponding functional groups contained in LCRLE. And using quantum chemistry calculations and molecular dynamics simulations to deepgoing exploration of the corrosion inhibition activities of the three components. Surface morphology analysis shows that when LCRLE is added to the corrosion solution, LCRLE can effectively inhibit copper corrosion at 298 K for 20 h. The electrochemical tests data show that when LCRLE is contained, the copper electrode can be effectively protected. When the concentration of Luffa cylindrica roem leaves extract reaches 600 mg/L, its corrosion inhibition ability can reach 91.3%. The adsorption isotherm simulation shows that the adsorption of LCRLE at the Cu interface accords to the Langmuir mono-layer model. This work adopts the pure water method to obtain LCRLE, which has broad application prospects. Luffa cylindrica roem leaves are widely available, so the application cost of corrosion inhibitors will be greatly reduced.

Unidirectional electron transport from graphitic-C3N4 for novel remote and long-term photocatalytic anti-corrosion on Q235 carbon steel

Graphitic carbon nitride (g-C3N4) has been considered as a candidate for anti-corrosion material owing to its barrier property and photoelectrochemical cathodic protection. However, the related mechanisms remain obscure and are not fundamentally investigated. Herein, g-C3N4 coating on Q235 CS plate matrix can be simply made via conductive adhesive, which helps to achieve scalable production and high cost-effectiveness. It can also ensure the unidirectional transfer of excited electrons from g-C3N4 to metal to prevent the consumption of free electrons on metal and reduce Fe2O3 onto Fe. During the photocatalytic anti-corrosion process, the electron holes were simultaneously consumed via oxidizing water to achieve the balance between electron and hole transport. By combining theoretical calculation and experimental analysis, the anti-corrosion mechanisms of g-C3N4 were systematically investigated. g-C3N4 displayed superior long-term and remote anti-corrosion properties, especially for remote and difficult-to-reach areas, which will make it become a new generation of anti-corrosion 2D material with promising performance.

Study on anti-corrosion performance and mechanism of epoxy coatings based on basalt flake loaded aniline trimer

The main protection mechanism of anti-corrosion coatings was to shield and hinder corrosive media. When inorganic flake fillers were added to improve the anti-corrosion performance of the coatings, it was necessary to solve the problem of inorganic-organic compatibility. This paper combined the barrier properties of flaky and chemically inert basalt scales with the corrosion inhibition of aniline trimers, and prepared aniline trimers modified basalt scales to improve the anticorrosion performance of the coatings. Aniline trimer was conducive to the compatibility and dispersion of basalt flakes in epoxy resin. The enhancement of shielding and anti-corrosion performance of the coatings was attributed to the dispersed distribution of basalt flakes, which reduced the water content and diffusion rate in coatings. Aniline trimer acted as the corrosion inhibitor. When corrosive media penetrated the coatings, it adsorbed on the metal surface and formed protective films, thereby enhancing the corrosion resistance of the coatings. The aniline trimer modified basalt flakes increased the anti-corrosion resistance of epoxy coatings by two orders of magnitude, and its optimal mass content was about 10%.

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents.

Tea tree extract, containing antioxidant constituents α-terpineol, terpinen-4-ol, and α-terpinene, has a wide range of applications in the cosmetic, food, and pharmaceutical industries. In this study, tea tree extract showed an anticorrosive effect under 1 M HCl solution on mild steel (MS) and 304 stainless steel (STS). Uniform corrosion for MS and pitting corrosion for STS at 298 K were retarded, with inhibition efficiencies of 77% and 86%, respectively. The inhibition of uniform and pitting corrosion was confirmed by scanning electron microscopy and laser scanning confocal microscopy in terms of surface roughness and pitting morphologies. The most effective constituent contributing to the inhibitory performance of tea tree extract was revealed to be α-terpineol, with an inhibition efficiency of 83%. The adsorption of tea tree extract was confirmed by surface characterization analysis using Fourier transform infrared spectroscopy, Raman spectroscopy, and Electrochemical impedance spectroscopy. Interestingly, G- and D-peaks of Raman spectra were detected from the inhibited steels, and this finding is the first example in the corrosion inhibition field. The anticorrosion mechanism can be explained by the formation of organic-Fe complexes on the corroded steel surface via electron donor and acceptor interactions in the presence of an oxygen atom of the hydroxyl group or ether of organic inhibitors.

Mapping the knowledge domains of research on corrosion of petrochemical equipment: An informetrics analysis-based study

Corrosion of petrochemical equipment is one of the reasons that affect the process safety and sustainability of the petrochemical industry. To understand the research status of corrosion in petrochemical equipment and explore the knowledge base and hot trends, 1887 studies from 2000 to 2020 on the WOS retrieval platforms SCIE, SSCI, A & HCI and CPCI-S were used as data samples. Co-occurrence analysis, keyword mutation analysis, and co-citation analysis were used to analyze the current status of petrochemical equipment corrosion research using the method of informetrics. The number of papers published in China ranks first among countries/regions, and the Universidade de Lisboa ranks first among relevant institutions. Corrosion resistance structure analysis, corrosion loss model analysis and steel structure corrosion analysis are the basis of knowledge in the field of petrochemical equipment corrosion research, and scholars mostly take oil tankers as the object of analysis. Engineering Failure Analysis, Marine Structure, Ocean Engineering, Corrosion Science and Corrosion are the core journals in this field. At present, the basic theory and research systems in the field of petrochemical equipment corrosion have been largely completed, and many research directions and broad frontier branches are currently emerging. “Research on corrosion mechanism and anti-corrosion mechanism”, “microbial corrosion research” and “corrosion detection and monitoring research” are the three core development paths in this field. In the process of evolution, the research path is gradually becoming refined, and research directions are gradually changing to nano anti-corrosion materials. Simulation, biofuels and composites are the new research frontiers of research on corrosion of petrochemical equipment.

Corrosion resistance of a superhydrophobic dodecyltrimethoxysilane coating on magnesium hydroxide-pretreated magnesium alloy AZ31 by electrodeposition

Superhydrophobic coatings can remarkably improve the anti-corrosion performance of many materials. In this study, a fluorine-free superhydrophobic Mg(OH) 2 /DTMS composite coating was successfully fabricated on the surface of Mg alloy AZ31 by hydrothermal process and electrodeposition of dodecyltrimethoxysilane to enhance corrosion resistance. The corrosion resistance of the coating was tested using a potentiodynamic polarization scan, electrochemical impedance spectroscopy (EIS), and hydrogen evolution measurements. The superhydrophobicity was investigated by measuring water contact angles and sliding angles. The results showed that the Mg(OH) 2 /DTMS composite coating was composed of walnut-like micro/nanostructures and exhibited superhydrophobicity with a contact angle of 165.1° ± 2.1° and a sliding angle of 3.5° ± 0.6°. Moreover, the corrosion current density of the composite coating (1.777 × 10 −8 A·cm −2 ) decreased about three orders of magnitude compared with uncoated AZ31 substrate (7.342 × 10 −5 A·cm −2 ), suggesting that the composite coating had excellent corrosion resistance. Finally, the anti-corrosion mechanism of the composite coating was also addressed. To improve the anti-corrosion performance of magnesium alloys, a superhydrophobic Mg(OH) 2 /DTMS composite coating was successfully fabricated on the surface of Mg alloy AZ31. The biomimetic micro/nanostructures and low surface energy coating has been successfully obtained, which exhibit high self-cleaning performance. Moreover, the results not only provide the composite coating effectively reduce the direct contact of the AZ31 substrate with corrosive species, but also served as a physical barrier to corrosive agents. This new composite coating was anticipated to find promising applications for Mg alloys.

Preparation of Fe3O4/PANI nanocomposite and its metal anticorrosive activity

Spherical Fe3O4/polyaniline(PANI) nanocomposites with core-shell structure were prepared by oxidative polymerization of aniline on the Fe3O4−/aniline(ANI)+ nanocomposite template formed by the electrostatic interaction between nano-Fe3O4 and aniline salt. FTIR and UV–Vis results indicate that there is coordination interaction between Fe3O4 and PANI interface. SEM and TEM results show that the thickness of PANI shell increases with the increase of aniline/Fe3O4 mass ratio. Compared with PANI, Fe3O4/PANI nanocomposites maintain obvious redox activity in neutral medium. The organic composite coating was prepared by filling Fe3O4/PANI nanocomposites into waterborne acrylate/amino baking paint. The results show that the composition ratio of aniline/Fe3O4 has a great influence on the metal anticorrosive activity of Fe3O4/PANI nanocomposites. The long-term metal corrosion resistance of Fe3O4/PANI(1:2) composite coating is three times as compared with unfilled organic coating. The metal anticorrosive mechanism of Fe3O4/PANI nanocomposites has been revealed to be the excellent nano-barrier effect and the metal surface passivation.