article · Anti-Corrosion Methods and Materials
This research evaluates the anti-corrosion performance of five readily available and benign amino acids on magnesium exposed to aqueous sodium chloride solutions. Using electrochemical assessment methods, the study investigated alanine, arginine, histidine, lysine, and proline as environmentally sustainable alternatives to conventional corrosion inhibitors. The results demonstrate that all tested amino acids reduced the corrosion rate of magnesium. Performance varied across the group, with inhibition efficiency following an ascending order from alanine to arginine, histidine, lysine, and finally proline, which achieved the highest efficiency at 85.1 percent. The findings also revealed that the protective efficiency was inversely related to the molecular weight of the compounds. Furthermore, shifts in open circuit potential remained under 0.085 V SCE, identifying these amino acids as mixed-type corrosion inhibitors capable of acting on both anodic and cathodic processes to protect magnesium metal.
Magnesium is susceptible to rapid degradation in saline environments, often requiring chemical treatments to control rust and deterioration. Many conventional corrosion inhibitors pose environmental and safety hazards. Demonstrating that non-toxic, readily available amino acids can effectively mitigate magnesium corrosion supports the broader transition toward greener, more sustainable industrial chemical additives.
This work points to the potential use of benign amino acids, particularly proline, as green corrosion inhibitor formulations for magnesium alloys exposed to saline environments. The primary beneficiaries would be chemical formulators and industrial manufacturers seeking non-toxic additives. Because the findings are based on laboratory-scale electrochemical testing in aqueous sodium chloride solutions, the technology remains at an early stage of development prior to real-world industrial formulation and deployment.
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Purpose In line with current research efforts to develop eco-friendly strategies for corrosion mitigation, the purpose of this study is to appraise the anti-corrosion potential of selected amino acids on magnesium corrosion in sodium chloride solutions. Design/methodology/approach The corrosion inhibition of magnesium in aqueous solutions in the presence of benign, eco-friendly and readily available amino acids (alanine, arginine, histidine, lysine, proline) were evaluated using electrochemical methods. Findings Amino acids suppressed magnesium corrosion rate in aqueous sodium chloride solutions. The order of inhibition efficiency (%IE) was as follows: alanine < arginine < histidine < lysine < proline. The open circuit potential shift with respect to the blank was less than 0.085 V SCE , indicating that the amino acids are mixed-type corrosion inhibitors. In addition, the %IE of the amino acids was inversely proportional to the molecular weight. The results obtained indicate that the amino acids can serve as sustainable eco-friendly corrosion inhibitors for magnesium with the best inhibition efficiency attributed to proline with an efficiency of 85.1%. Originality/value New information on the application of amino acids as green sustainable corrosion inhibitors is provided herein.
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DOI: 10.1108/acmm-04-2023-2796
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