采用外加恒电位下腐蚀电流—温度扫描的方法，研究了在0.5wt.%Cl-溶液中,硫酸根离子浓度对316不锈钢的点腐蚀行为的影响。结果表明：随着硫酸根离子浓度的增加，钝化电流增加，开路电位降低；当硫酸根离子浓度低于0.42wt.%时，316不锈钢的临界点蚀温度比不存在硫酸根离子时的临界点蚀温度低，当硫酸根离子浓度大于0.42wt.%时，316不锈钢的临界点蚀温度比不存在硫酸根离子时的临界点蚀温度高。从竞争吸附的角度进行分析，对硫酸根离子加速与抑制点蚀两种作用规律的形成原因进行了解释。
The influence of sulphate ion on the pitting corrosion behavior of 316 stainless steel has been studied by measuring the relationship of corrosion current and temperature in 0.5wt.% chloride ion solution at different concentration of sulphate ion under constant applied potentials. The results showed that with the increase of sulphate ion concentration, the passivation current of 316 stainless steel increased and the Open Circuit Potential of 316 stainless steel decreased; When the concentration of sulphate ion is less than 0.42wt.%, the critical pitting temperature of 316 stainless steel is lower than the value without sulphate ion, and when the concentration of sulphate ion is more than 0.42wt.%, the critical pitting temperature is higher than that value. The inhibition and acceleration effect of sulphate ion on the pitting corrosion was discussed by analyzing the mechanism of the ion-competitive adsorption.
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