不锈钢在高温高浓度溴化锂溶液中电化学行为研究

Electrochemical behaviors of stainless steel in high temperature and high concentration lithium bromide solution

在60%LiBr+0.07mol/LLiOH溶液中,研究了LiNO3和Na2MoO4对304和430不锈钢电化学行为的影响.结果表明,添加LiNO3对两种钢均具有良好的缓蚀效果,但LiNO3达到1000mg/L时430钢产生点蚀.复合添加150mg/LNa2MoO4后,NO-3能优先封闭金属表面活性点,并且促进稳定的Mo保护膜形成,对304钢和430钢表现出更佳的缓蚀效果.

In high temperature 60% LiBr+0.07 mol/L LiOH solutions, the effects of LiNO3 and Na2MoO4 on 304 and 430 stainless steel′s electrochemical behaviors are investigated. The result shows that LiNO3 inhibits on both types of steel but pitting occures on 430 stainless steel when LiNO3 concentration is more than 1 000 mg/L. When adding 150 mg/L Na2MoO4, NO-3 encloses the activesite on the metal surface first and accelerates to form stable Mo protection film. The harmonizing effects of Na2MoO4 and LiNO3 have excellent inhibition results on both steel.