蛋氨酸及脯氨酸对304不锈钢的缓蚀性能

Corrosion Inhibition of Methionine and Proline to 304 Stainless Steel

采用电化学测试、扫描电镜观察研究了蛋氨酸和脯氨酸对304不锈钢在共晶盐相变蓄冷材料(PCMs)溶液中的缓蚀性能;并通过量子化学计算和分子动力学模拟从理论方面进一步研究了缓蚀剂的缓蚀机理。结果表明:蛋氨酸、脯氨酸以及蛋氨酸/脯氨酸复配缓蚀剂均能减缓304不锈钢在PCMs溶液中的腐蚀,其中蛋氨酸/脯氨酸复配缓蚀剂的缓蚀效果最好;三种缓蚀剂均为混合型缓蚀剂;蛋氨酸和脯氨酸分子均存在活性位点可以与铁表面发生吸附,在PCMs溶液中抑制金属腐蚀。

The corrosion inhibition of methionine and proline to 304 stainless steel in phase change materials(PCMs)solution was studied by electrochemical testing and scanning electron microscopy(SEM)observation.The corrosion inhibition mechanism was further studied theoretically by quantum chemical calculation and molecular dynamics simulation.The results show that the inhibitors of methionine,proline and methionine/proline compound could protect 304 stainless steel from corrosion in PCMs solution.The methionine/proline compound inhibitor had the highest inhibition efficiency.All three corrosion inhibitors were mixed corrosion inhibitors.Both methionine and proline molecules,which had active sites and thus could adsorb on the surface of iron,could effectively inhibit metal corrosion in PCMs solution.