无机阴离子对铁腐蚀行为的影响及其相关机理的探讨

无机阴离子对铁腐蚀行为的影响及其相关机理的探讨 THE EFFECTS OF INORGANIC ANIONS ON CORROSION BEHAVIOR OF IRON AND APPROACHING OF RELEVANT MECHANISM 张旭 1 2 3 first-author 邹津耘 1 2 3 武汉大学环境科学系 武汉大学环境科学系 Department of Envirnment Science,Wuhan University Department of Envirnment Science,Wuhan University 广东中山精细化工股份有限公司 广东中山精细化工股份有限公司 武汉大学环境科学系广东中山精细化工股份有限公司 武汉大学环境科学系广东中山精细化工股份有限公司 采用极化曲线和极化电阻法研究了０．５ｍｏｌ·Ｌ－１Ｈ２ＳＯ４介质中ＳＣＮ－及Ｉ－对工业纯铁腐蚀行为的影响．结果表明，低浓度的ＳＣＮ－对铁的腐蚀过程有负催化作用，较高浓度的ＳＣＮ－有正催化作用．本文提出了在负催化作用条件下ＳＣＮ－参与铁腐蚀的阴、阳极反应机理．至于Ｉ－则通过复盖效应阻化铁的腐蚀过程． The effect of SCN- and I- on corrosion behavior of iron in 0. 5 mol·L-1H2SO4 were investigated by potentiodynamic and polarization resistance techniques. Experimental results show that there exist negative catalytic effect for the corrosion process of iron at lower concentration region of SCN-,and positive catalytic effect at higher concentration region of SCN-. A mechanism which explains thiocyanate ion participating in anodic and cathodic processes of iron corrosion is proposed in sulfuric acid solution. As regards I-,it can inhibit corrosion process of iron because of blocking effect. 无机阴离子 铁腐蚀行为 腐蚀机理 inorganic anion corrosion behavior of iron corrosion mechanism TG174.42 国家自然科学基金,中国科学院腐蚀科学开放实验室资助 1994-04-01 2021-04-01 4