430不锈钢在含Cl^-及CO_2体系中的孔蚀行为

PITTING BEHAVIOUR OF TYPE 43O STAINLESS STEEL IN SOLUTIONS CONTAINING Cl^- AND CO_2

用动电位滞后曲线法研究了４３０不锈钢在不同介质条件下的孔蚀特性及行为，并对一些缓蚀剂进行性能测试。结果表明Ｃｌ－浓度升高，能促进４３０不锈钢产生孔蚀；温度也有同样作用。氧是维持不锈钢保持纯态的主要因素之一，ＣＯ２则加速４３０不锈钢在ＮａＣｌ溶液中产生孔蚀。Ｎａ２ＭｏＯ４、Ｎａ３ＶＯ４等对４３０不锈钢在含Ｃｌ－及ＣＯ２体系中的孔蚀有抑制作用，且Ｎａ２ＭｏＯ４和Ｎａ３ＶＯ４有一定的协同效应。

The characteristics of pitting corrosion and corrosion mechanism for type 430 stainless steel in different solutions were studied using the electrochendcal potentiodynamic hysteresis curve technique. Inhibition performance of some inhibitors was also examined. Experimental results showed that increase in concentration of Cl-and solution temperature could accelerate the pitting of 430ss. Oxygen was one of the principal factors to keep passivity of the steel. CO2 was an accelerant for pitting. Na2MoO4 and Na3VO4 could prevent the pitting corrosion in solution containing Cl-and CO2, and they had a synergistic inhibition effect.