Corrosion Inhibition Mechanism Research Articles

Green synthesis of functionalized fluorescent carbon dots from biomass and their corrosion inhibition mechanism for copper in sulfuric acid environment

The design of new corrosion inhibitors for metallic copper is an important path to ensure that it is not corroded in a wide range of applications such as chemical and electronic industries. In this article, carbon dots with fluorescence properties are synthesized as corrosion inhibitors from green biomass through the hydrothermal method. This method does not generate a large number of waste solvents and toxic byproducts, and has excellent potential to replace other methods. Structural characterizations reveal that the biomass carbon dots (BCDs) contain a significant number of heteroatoms (such as N and S) and heteroatom-containing functional groups, which align with the general properties of corrosion inhibitors. The electrochemical analysis demonstrates an impedance value of 6314.1 Ω cm2 in a 50 mg/L BCD solution at 298 K, significantly higher than that observed in the blank solution, resulting in a corrosion inhibition efficiency of 92.97%. Morphological characterizations reveal that BCDs protect copper through adsorption and coordination film mechanisms. BCDs physically adsorb onto the copper surface and chemically coordinate with Cu+ to form a dense and ordered protective film. Notably, we utilize the fluorescence properties of BCDs as a probe to investigate the protective mechanisms of corrosion inhibitors on metals. Overall, the BCDs show great potential as eco-friendly corrosion inhibitors for copper protection, offering a new direction in corrosion research and practical applications.

Corrosion inhibition of steel reinforcements in seawater sea sand concrete by alkali-activated slag based coatings

Chloride-induced corrosion is a severe problem for reinforced concrete structures exposed to marine environments. In such situations, the surface coating acts as a cost-effective means to inhibit the corrosion of steel reinforcement. In this work, the effectiveness of alkali-activated slag (AAS) coatings in inhibiting corrosion of steel reinforcement in seawater sea-sand concrete was assessed through a series of electrochemical tests. Two different types of AAS coatings (i.e., with and without latex polymer modification) were designed in addition to a conventional cement coating (i.e., for comparison purpose). It was found that AAS coatings are effective in preventing steel corrosion in both normal strength seawater sea sand concrete (NSSC) and ultra-high performance seawater sea sand concrete (UHP-SSC), which simulate a chloride contaminated concrete environment in short-term exposure. However, the protectiveness of conventional cement coating was valid only in UHP-SSC. The above protection effects were confirmed under both the fresh and hardened states of SSC, which were attributed to the coating-induced prepassivation of steel reinforcement and the coatings' chloride barrier effect. The corrosion inhibition mechanisms of the coated steel reinforcements in NSSC and UHPSSC are further elaborated.

Synthesis of a dibenzimidazole compound and its corrosion inhibition behavior on AZ91D Mg alloy in 3.5 wt.% NaCl solution

In this work, a low-cost and easily purified small molecule dibenzimidazole compound (BBI) was synthesized by the condensation of o-phenylenediamine and malonic acid. BBI was a new corrosion inhibitor for magnesium alloys and its corrosion inhibition behavior on AZ91D magnesium alloy was studied by electrochemical measurements, surface analysis and theoretical calculations in 3.5 wt.% NaCl solution at 30 °C. The adsorption behavior and corrosion inhibition mechanism of BBI molecules were discussed. It was found that BBI exhibited excellent inhibition effect on the corrosion of magnesium alloy. When BBI concentration was 0.25 g/L, the optimal corrosion inhibition efficiency was 86.2%. The adsorption of BBI molecule obeyed Langmuir adsorption on the surface of magnesium alloy, and one side of BBI molecule was adsorbed on the surface of magnesium alloy in parallel through physical and chemical mixed adsorption.

Exploration of imidazol-4-methylimine thiourea as effective corrosion inhibitor for mild steel in hydrochloric medium: Experimental and theoretical studies

Mild steel is considered to be the most common engineering material and the key problem is its susceptibility to corrosion, a problem that can be effectively addressed by corrosion inhibitors. In this work, thiosemicarbazide chain was innovatively used for modifying the imidazole ring to improve the inhibition effect of imidazole compound and thus a high-effective corrosion inhibitor of imidazol-4-methylimine thiourea (MIT) for mild steel in HCl medium was obtained. The inhibition performance of MIT was evaluated by gravimetric measurements, electrochemical tests, and surface analyses. The results indicated that the optimal concentration of MIT was 200 mg L−1 in 1.0 M HCl solution at 298 K, with an inhibition efficiency of 93.7 %. The adsorption of MIT molecules on mild steel was demonstrated to be an exothermic process according to the Langmuir adsorption isotherm, belonging to a mixed adsorption mechanism of physical and chemical adsorption (ΔGads° = −31.87 kJ mol−1, 298 K), which effectively retards the MS corrosion process by blocking both anodic and cathodic reactions. Furthermore, theoretical calculations based on density functional theory and molecular dynamics simulations indicate that the corrosion inhibition mechanism of MIT molecules is mainly attributed to two effective ways, involving shielding effect of the MIT-adsorption film with multiple anchors and reduction of attacking ions.

Developing the inhibition mechanism for amide-based amino acids in carbonated concrete environment and assessing the migration ability in concrete

The corrosion inhibition mechanism of amide-based amino acids, Asparagine (Asn) and Glutamine (Gln) for steel in concrete pore solution simulating carbonated environment was explored by the means of gravimetric, electrochemical and surface characterization techniques. Thereafter, percolation ability of Asn and Gln was assessed through OPC and PPC concretes by UV–visible spectroscopy technique for their application as migratory corrosion inhibitors in concrete. The results revealed that Asn as well as Gln can be efficiently used in carbonated corrosive environment for steel inhibition. The protection ability of Gln was however, higher than Asn. Gln exhibited 50% lower corrosion current density values than Asn. Also, the charge transfer resistance of Gln inhibited specimens was 3 times higher than Asn inhibited specimens. The layer developed on steel with Gln as corrosion inhibitor was thermodynamically more stable than Asn as equilibrium constant of adsorption (kads) was 2.11 times higher for Gln. Optical and SEM images revealed the formation of a thin layer in the case of Asn while a thick layer was seen to form on Gln inhibited specimens. Surface layer characterization by FTIR and XPS evinced the formation of Asn-Fecomplex and Gln-Fecomplex on steel surface. Both the compounds bound the Fe ions by chelation through O atom from amide and carboxylate functional groups. Higher efficiency of Gln was attributed to development of more adherent protective film due to its longer carbon chain length than Asn. Gln’s chelate ring experienced lower steric hindrance than Asn’s ring. Asn and Gln percolated through concrete and reached upto a depth of 25mm within 15 days of application. Conclusively, it can be said that Asn and Gln can be employed as corrosion inhibitors for concrete subjected to carbonation-induced corrosion.

Insight into corrosion inhibition mechanism of carbon steel by an algal extract as an eco‐friendly corrosion inhibitor in 0.5 M H2SO4: Experimental and molecular dynamics study

AbstractTo explore the potential of new ecological corrosion inhibitors, we investigated the mechanism of corrosion inhibition in carbon steel using Halopitys incurvus, an algal extract available in both crude and chromatographic fractions, in a 0.5 M H2SO4 medium. Various methods were employed, including gravimetry, electrochemical impedance spectroscopy, polarization curves, scanning electron microscopy (SEM) techniques, and molecular dynamics. The crude extract exhibited a high corrosion‐inhibiting potential, with a maximum inhibitory efficiency of 85.30% at 600 mg/L. The electrochemical results indicated mixed behavior of the crude extract. Furthermore, we found that the adsorption of the crude extract onto the metal surface followed the Langmuir isotherm pattern. The SEM study confirmed our proposition that extract molecules were adsorbed onto the carbon steel surface. Using the chromatographic fractionation protocol, we were able to distinguish four main fractions, and the most effective fractions reached an inhibitory efficiency value of 96.00% at 100 mg/L. The molecular dynamics simulation confirmed the experimental results.

Corrosion inhibition properties of spinach extract on Q235 steel in a hydrochloric acid medium

The use of environmentally friendly corrosion inhibitors (CIs) is an effective way to overcome the environmental problems caused by existing CIs that contain nitrogen or phosphorus components. Plant extracts, as a type of environmentally friendly CI, have attracted considerable attention. In this work, the corrosion inhibition properties of spinach extract (AESPE) on Q235 steel were studied in a hydrochloric acid medium. First, AESPE was extracted from spinach by an ethanol-acetone reflux method and its main structural and stability parameters in hydrochloric acid medium were determined by infrared spectroscopy (FTIR) and ultraviolet spectroscopy (UV–vis). Second, the corrosion inhibition properties of AESPE on Q235 steel in a 0.5 M hydrochloric acid solution were studied by weight loss (WTL), dynamic potential polarisation (PDP), linear polarisation (LPR), electrochemical impedance spectroscopy (EIS) and quantum chemical calculation methods. The results showed that AESPE could significantly slow the corrosion rate (Vcorr) of Q235 steel in 0.5 M hydrochloric acid medium, which was via a mixed corrosion inhibition mechanism at the cathode and anode. As the AESPE concentration increased, the cathode and anode currents decreased and the active corrosion sites were blocked; thus, the Vcorr decreased and the corrosion inhibition efficiency (E (%)) increased. Under the conditions of 303 K and 300 mg⋅L–1 AESPE, the E (%) of AESPE for Q235 steel was>90%. As the system temperature increased, the E% of AESPE for Q235 steel decreased but the extent of this decrease was small. This work shows that AESPE is an environmentally friendly CI with a good corrosion inhibition effect.

Combined atomic-scale/DFT-theoretical simulations and corrosion protection study of AA2024-T3 in 3.5% NaCl by phenolphthalein derivatives: Surface characterization (FT-IR, FT-RAMAN, and SEM)

This work investigates the effectiveness of two organic inhibitors, CH3O-φ-OCH3 (P3) and bzO-φ-Obz (P4), in preventing corrosion of aluminum alloy 2024-T3 in a 3.5% NaCl solution. The study employs a combination of experimental and theoretical research methods to gain a comprehensive understanding of the corrosion inhibition behavior. Density functional theory (DFT) studies and molecular dynamics (MD) simulations provide atomic-level insights into the resistance mechanism and the influence of the molecular structures of P3 and P4 on corrosion inhibition. The potentiodynamic polarization experiments (PDP) confirm that the studied compounds are mixed-type inhibitors. At a concentration of 10−4 M, P3 and P4 exhibit impressive inhibition efficiencies of 87.5% and 92.5%, respectively. FTIR and Raman spectroscopy were utilized to show that an adsorbent protective layer was formed on the surface of the aluminum when it was immersed in an inhibited solution. The scanning electron microscopy (SEM) morphology analysis indicates that the presence of P3 and P4 inhibitors effectively reduces corrosion on the surface of the AAl 2024 alloy. Furthermore, energy-dispersive X-ray spectroscopy (EDS) analysis confirms the formation of a chemical particle coating on the surfaces of the Al alloy. Electrochemical impedance (EIS) measurements of total resistance bias (Rp) further demonstrate the superior corrosion resistance of the inhibitors, as the resistance increases with inhibitor concentration. These findings highlight the strengths of this work in providing a comprehensive understanding of the corrosion inhibition mechanism and the excellent performance of P3 and P4 as inhibitors for aluminum alloy 2024-T3 in a NaCl environment.

Corrosion inhibition of aluminium alloy in NaCl solution by glycerol from biodiesel production

It was evaluated the potential of using crude glycerol, a by-product of biodiesel production from vegetable oil, as a «green» corrosion inhibitor for aluminum alloys in the neutral chloride-containing medium. It was found that it has inhibitory properties and efficiently protects aluminum alloys from corrosion in 0.1% NaCl solution; the degree of protection was up to 79%. The protective action of crude glycerol increases with increasing its concentration to 2.5 g/l. Impedance modulus of aluminum alloy increases in inhibited corrosion solution. The mechanism of corrosion inhibition is the physical and partially chemical adsorption of molecules of crude glycerol components, and probably the formation of copper-glycerol complexes on the metal surface. The adsorption of the studied inhibitor is described by the Frumkin isotherm. Energy dispersive x-ray analysis confirmed the formation of an organic protective layer on the metal surface.

Unraveling the corrosion inhibition mechanism of triazine derivatives for carbon steel: Experimental and theoretical insights into interfacial adsorption

Triazine derivatives, 3-(4-thioxo-1,3,5-triazinan-1-yl) propanoic acid (TPA) and 1,5-diphenyl-1,3,5-triazinane-2-thione (DTT), were synthesized by a one-step synthetic process and utilized as high efficiency corrosion inhibitors for carbon steel (CS) in the oil production. Experimental tests demonstrate that both TPA and DTT show superior inhibition performance, with inhibition efficiencies (IEs) of 97.8% and 99.1%, respectively. GFN-xTB calculations reveal the adsorptions of TPA and DTT on CS surface through the S, N, O atoms of TPA, or the S, N atoms and phenyl ring of DTT. The most stable adsorption configurations of TPA and DTT are at an inclined angle of 15o between the thiourea fragment and steel surface, which are determined with different initial adsorption configurations. The presence of phenyl ring in DTT not only endows it with stronger hydrophobicity, but also facilitates its strong absorption on CS surface by forming multiple Fe–C bonds through the π-electrons in the phenyl ring, which accounts for the better inhibitive effect of DTT. Additionally, the presence of H2O solvent deteriorates the adsorptions of TPA and DTT due to the weak interactions between the TPA/DTT and H2O molecules, which is demonstrated by the more positive adsorption energy and longer bonding distances of TPA and DTT on Fe surface.

Review on anti-corrosion properties of expired antihypertensive drugs as benign corrosion inhibitors for metallic materials in various environments

Discovering new classes of organic corrosion inhibitors, such as expired drugs, can provide cheaper, low-toxic, and highly efficient alternatives to the toxic organic counterparts that serve as an efficient recycling or disposal strategy. Antihypertensive drugs constitute one of the cheapest classes of drugs, globally, and have been reported as highly effective corrosion inhibitors for a variety of metallic materials in various corrosion environments. The corrosion inhibition mechanism of these drugs, generally, involves the adsorption on the metallic surfaces and the formation of a protective organic film that retards the attack of substrates by corrosive entities in the media. The drug molecular structure usually contains π-bonds, phenyl rings, and polar functional groups (such as –NH2, –OH, –CN, and −Cl) which influence the electron density within the inhibitor framework and also facilitate adsorption of the drug on the metal surface. Generally, most antihypertensive drugs act as mixed-type inhibitors and usually obey Langmuir adsorption isotherm revealing physisorption adsorption mechanisms except telmisartan, losartan potassium, and atenolol when used in nitric acid. The reported inhibition efficiency of the drugs is generally above 90% with spironolactone having the highest efficiency of 98.1% at 30 °C.

Exploring the Effectiveness of Isatin–Schiff Base as an Environmentally Friendly Corrosion Inhibitor for Mild Steel in Hydrochloric Acid

A recent study has shown that Schiff base OHMHI is an effective inhibitor of the corrosion of mild steel in acidic media. The study utilized weight loss measurements and electrochemical techniques, such as EIS and potentiodynamic polarization, to analyze the corrosion inhibition efficiency of OHMHI. The results of the study show that the presence of OHMHI in the corrosive environment significantly reduced the corrosion rate of mild steel and increased its corrosion resistance. The impedance spectra analysis indicated that OHMHI was adsorbed on the surface of mild steel, providing a protective layer. The potentiodynamic polarization study confirmed the protective role of OHMHI by showing an increase in the passive current density of the mild steel in the presence of OHMHI. The inhibitory efficiency of OHMHI was found to be 96.1%, indicating that it is an effective corrosion inhibitor for mild steel. The study also investigated the optimal conditions for the use of OHMHI as a corrosion inhibitor, with a concentration of 0.5 mM and a temperature of 303 K being chosen. The Langmuir adsorption isotherm concept was used to demonstrate the physical and chemical adsorption of OHMHI on the surface of mild steel. Morphological investigations of the uninhibited and inhibited surfaces of the mild steel specimen were examined using scanning electron microscopy (SEM) analysis. Furthermore, computational investigations using density functional theory (DFT) and experimental data were merged to explore the corrosion inhibition efficiency and mechanism of inhibition. Although the results are promising, further studies are needed to determine the long-term effects of OHMHI on mild steel corrosion and to evaluate its effectiveness under different environmental conditions. Overall, the study highlights the potential of OHMHI as an effective corrosion inhibitor for mild steel in acidic media.

Exploring the corrosion inhibition mechanism of Serine (Ser) and Cysteine (Cys) in alkaline concrete pore solution simulating carbonated environment

The corrosion inhibition mechanism of two amino acids, Serine (Ser) and Cysteine (Cys) for steel in alkaline concrete pore solution simulating carbonated environment was explored by the means of electrochemical techniques, namely, open circuit potential, potentiodynamic polarization scan and electrochemical impedance spectroscopy. High inhibition efficiencies (>90 %) were recorded by both the inhibitors. Moreover, used amino acids prevented the corrosion of steel by acting as anodic-type inhibitors. The inhibitive solution analysis was performed through UV–vis technique which confirmed the formation of inhibitor-Fe(III) complexes signifying clear interaction between steel and corrosion inhibitors. Surface of steel was analysed after submergence in corrosive solutions, with and without the inhibitors, by the means of optical microscopy, SEM-EDS, FTIR and XPS. The results highlighted the formation of a compact, barrier layer comprising of metal-inhibitor complex. The type of adsorption occurred and the isotherm followed during the adsorption were explored by performing gravimetric analysis at six different concentrations of Ser and Cys. The outcomes revealed that both the amino acids adsorbed on the steel surface by physiochemisorption process following the Langmuir isotherm. Subsequently, with the help of the aforementioned techniques, an inhibition mechanism for Ser and Cys in carbonated concrete environment was conjectured. Ser bound with Fe ions through the carboxylate functional group only, while Cys formed chelate with Fe ions through thiolate as well as carboxylate functional groups. A more thermodynamically stable protective layer was formed in the case of Cys attributed to the strong interaction between Fe ions and thiolate functional group.

鋼繊維が鋼繊維補強コンクリートのひび割れ部における鉄筋腐食に及ぼす影響に関する基礎的研究

Experimental studies were conducted to clarify mechanisms of corrosion inhibition of rebar by steel fibers in steel fiber reinforced concrete, SFRC. Test specimens with an artificial crack were made from concrete and SFRC, and steel fibers were arranged in the crack for some of concrete specimens. Specimens were exposure under wet-dry cycle and salt water were poured through the artificial crack when wet condition. After prescribed cycles, rebar corrosion was evaluated and impacts of steel fibers on that were discussed. As the results, it was confirmed that steel fibers inhibited the rebar corrosion, and its effect was appeared when fibers existed in the artificial crack mostly. The corrosion inhibition was shown for large crack specimens as well as small crack ones. An electrochemical factor due to corrosion of steel fibers themselves was supposed as main mechanisms of corrosion inhibition from the experimental results.

Study on the surface interaction mechanism, corrosion inhibition effect and the synergistic action of potassium oleate and fatty alcohol polyoxy ethylene ether on copper film chemical mechanical polishing for giant large scale integrated circuit

As the feature size of integrated circuit drops down to 20–14 nm, cobalt (Co) is used as the barrier layer material for multilayer copper (Cu) wiring. The chemical mechanical polishing (CMP) process of Cu film has developed from a combined rough polishing and fine polishing to a one-step polishing, which needs to stop on the Co barrier layer. So the removal rate (RR) of Co should approach zero to meet the requirement of higher RR selection ratio of Cu and Co. Inhibitors in the Cu film slurry play an important role for controlling the RR during CMP process. In this paper, the anionic surfactant potassium oleate (PO) was selected as a key corrosion inhibitor in Cu film CMP to enhance the RR selection ratio of Cu and Co. The complexation and corrosion inhibition mechanisms between PO and Cu or Co were revealed by electrochemical measurements, X-ray photoelectron spectroscopy and scanning electron microscopy measurements. It was found that the rapid complexation of a small amount of PO with Co2+ could increase the Co RR. However, with a higher concentration of PO, the effective catalysis caused the conversion of cobaltous hydroxide to tricobalt tetraoxide, and thus resulted in a lower Co RR. With the addition of the nonionic surfactant called fatty alcohol polyoxy ethylene ether (JFCE), the morphology of the PO aggregates changes to spherical, which weakened the inhibiting effect of PO on Cu RR, and thus a higher Cu RR and RR selection ratio of Cu and Co was achieved. The synergistic action mechanism of PO and JFCE on Cu and Co surfaces was analyzed systematically. The present work provides an idea that surfactants are excellent candidates for metal inhibitors.

Corrosion of Metals Modified with Formulations Based on Organosilanes

Methods for preliminary modification of the surface of structural metals with formulations based on organosilanes, including both solutions of individual organosilanes and two-component mixtures consisting of two organosilanes or an organosilane with an organic corrosion inhibitor, have been developed. As a result of this modification, a self-assembling siloxane polymeric/oligomeric nanoscale layer is formed on the metal surface. Such layers are capable of changing the physicochemical properties of the metal surface, in particular reducing the susceptibility of the metal to corrosive destruction. In this work, the mechanism of formation of organosilicon nanolayers and their effect on the electrochemical and corrosion behavior of metals have been studied in detail by a set of electrochemical methods, while laboratory studies and accelerated corrosion tests of carbon steel and zinc, modified with formulations based on organosilanes, have been carried out. The greatest inhibitory effect is demonstrated by two-component modifying formulations, namely mixtures of vinyl with aminosilane and vinylsilane with benzotriazole. The mechanism of corrosion inhibition by surface nanolayers formed upon surface modification with two-component mixtures has been considered.

Inhibition mechanism of air nanobubbles on brass corrosion in circulating cooling water systems

Air nanobubbles (A-NBs) were used to inhibit the brass corrosion in circulating cooling water for the first time in the study. The results of mass loss method and electrochemical method showed that A-NBs had the obvious corrosion inhibition effect. The inhibition rate reached 52% at 35 °C. The impedance and surface characterization results of corrosion samples indicated that the corrosion inhibition mechanisms of A-NBs mainly included adsorption of corrosion ions, promoting the formation of the passivation film on metal surface and the formation of the bubble layer and scale film on metal surface. A-NBs are potential excellent corrosion inhibitors.

Corrosion inhibition of mild steel in 0.5 M HCL by substituted 1,3,4-oxadiazole

Organic inhibitors are normally used to inhibit the corrosion of metals or alloys in an aqueous environment. The anti-corrosive property of 5((6-Methyl-2-oxo-2H-chromen-4yl)thiomethyl)-2((N-(3-methyl-quinoxalin-2(1H)one)yl) methyl)-1,3,4-oxadiazole (MOD) on mild steel (MS) was studied. Which acts as a novel corrosion inhibitor for MS in 0.5 M Hydrochloric acid (HCl) solution and corrosion behavior in the temperature range of 303–323 K, without and with the MOD inhibitor, was calculated using potentiodynamic polarization, electrochemical impedance spectroscopy, and weight loss measurements. The surface topography of mild steel with, and without MOD was investigated by Scanning electron microscopy (SEM) technique. The inhibitory efficiency increases with an increase in MOD (50 ppm) concentration and showed a maximum of 84.85% in 0.5 M HCl at 303 K. The variation in kinetic and thermodynamic properties of MOD on MS indicates chemisorption and its mixed kind of inhibition activity followed by the Langmuir adsorption isotherm. The experimental results are supported by Density functional theory (DFT) simulations, indicating a potential corrosion inhibition behaviour of MOD on MS in acidic environments. A suitable mechanism for the corrosion inhibition of mild steel was put forth. The corrosion inhibition mechanism of mild steel was discussed. Mild steel is a low-cost engineering material that can be regularly used for various applications such as construction, advertising, vehicles, furniture, fencing, and more in various conditions, including mild acidic ones with a little caution.

Surface Corrosion Inhibition Effect and Action Mechanism Analysis of 5-Methyl-Benzotriazole on Cobalt-Based Copper Film Chemical Mechanical Polishing for GLSI

With integrated circuit (IC) technology nodes below 20 nm, the chemical mechanical polishing (CMP) of cobalt (Co)-based copper (Cu) interconnection has been gradually changed to one-step polishing, which requires rapid removal rate (RR) of Cu while controlling the height differences of concave and convex areas on the Cu surface, and finally achieving global planarization. Co as the barrier material is also required a lower RR to ensure a high Cu/Co removal rate selection ratio. Therefore, choosing the appropriate inhibitor in the slurry is extremely important. The corrosion inhibitor 5-methyl-benzotriazole (TTA) was thoroughly examined in this study for its ability to prevent corrosion on Cu film as well as its mode of action. The experimental results showed that TTA can effectively inhibit the removal of Cu under both dynamic and static conditions, which was also confirmed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) tests. The corrosion inhibition effect and mechanism of TTA was further revealed by open circuit potential (OCP), polarization curve, adsorption isotherm, quantum chemical calculation, UV–Visible and X-ray photoelectron spectroscopy (XPS) tests. It was found that TTA can inhibit the corrosion of Cu by physical and chemical adsorption on the Cu surface, which is conductive to obtain excellent planarization properties. At the same time, it was also found TTA can also inhibit the corrosion of Co by forming Co-TTA and promoting the conversion of Co(OH)2 to Co3O4, and a Cu/Co removal rate selection ratio of 104 was obtained, which provides a suitable corrosion inhibitor for the polishing of Co-based Cu interconnection CMP and has a broad application prospect.

Application of Biomass Corrosion Inhibitors in Metal Corrosion Control: A Review

Corrosion is the process of damaging materials, and corrosion of metallic materials frequently results in serious consequences. The addition of corrosion inhibitors is the most effective means of preventing metal corrosion. Until now, researchers have made unremitting efforts in the research of high-efficiency green corrosion inhibitors, and research on biomass corrosion inhibitors in a class of environmentally friendly corrosion inhibitors is currently quite promising. This work presents the classification of green biomass corrosion inhibitors in detail, including plant-based corrosion inhibitors, amino acid corrosion inhibitors, and biosurfactant corrosion inhibitors, based on the advantages of easy preparation, environmental friendliness, high corrosion inhibition efficiency, and a wide application range of biomass corrosion inhibitors. This work also introduces the preparation methods of biomass corrosion inhibitors, including hydrolysis, enzymatic digestion, the heating reflux method, and microwave extraction. In addition, the corrosion inhibition mechanisms of green biomass corrosion inhibitors, including physical adsorption, chemisorption, and film-forming adsorption, and evaluation methods of biomass corrosion inhibitors are also explicitly described. This study provides valuable insights into the development of green corrosion inhibitors.