以A3钢为研究对象，采用失重实验和电化学技术研究了A3钢在富营养化东湖水中的腐蚀行为.结果表明：A3钢在实验过程中腐蚀电流随时间增长逐渐减小；自腐蚀电位先降后升，而极化电阻逐渐增大，说明电极表面刚开始处于活化状态,然后电极表面“保护膜”不断生长，将电极表面覆盖，减缓了基体的腐蚀；电化学方法计算出富营养化水中A3钢的腐蚀电流与线性极化电阻的比例常数B值为23.6242；通过XPS分析得出A3钢腐蚀产物的成分为FeOOH，Fe3+与C、N、S结合的有机产物和FeSO4,其中Fe2+/Fe3+=0.24.
The initial corrosion behavior of A3 steel in waters of eutrophic east lake at Wuhan was studied using weight loss method and electrochemical techniques.The results showed that the corrosion currents of A3 steel reduced with the test time;the corrosion poteintials reduced first and then raised after,while the value of polarization resistances raised all along.The fact may tell us that the suface of electrode was in active state first;however,with the growth of a protective scale,by which the steel suface was gradually covered,and there with the corrosion rates were reduced;the electrochemical constant B of A3 steel in eutrophic waters was 23.6242 calculated by elctrochemical method.The corrosion products were analysed by XPS,and the main components were FeOOH, FeSO4,and organic products consisted of Fe3+,C,N and S.The value of Fe2+/Fe3+ by quantitative analysis was 0.24.
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