通过自腐蚀电位、极化曲线和阻抗谱等电化学测试方法,研究了半胱氨酸、蛋氨酸两种氨基酸作为缓蚀剂在0.5 mol/L硫酸介质中对X65钢的缓蚀性能.研究结果表明:该缓蚀剂在较低的浓度具有良好的缓蚀效果,缓蚀效率随着浓度的增加而提高;同浓度比较,半胱氨酸的缓蚀效率更高.缓蚀原因可能是氨基酸分子或腐蚀产物在金属表面的吸附作用;极化曲线表明是混合型缓蚀剂.

The inhibition effect of cystine and methionine on the corrosion of X65 steel in sulfuric acid solution (0.5 mol/L) was investigated using open-circuit potential measurements,polarization techniques and electrochemical impedance spectroscopy (EIS).The study revealed that the inhibitors had promising corrosion inhibition efficiency at low concentration and the inhibition efficiency (IE,%) increased with increasing the inhibitor′s concentration.At the same concentration,cystine was more efficient than methionine.The corrosion inhibition effect was based on the adsorption of the amino acid molecules and/or the deposition of corrosion products on the metal surface.Polarization curves revealed that the inhibitors were mixed type inhibitors.