摘要
采用电化学方法研究了316不锈钢在添加1‰(质量分数)和2‰Y2O3的熔盐中的腐蚀行为,采用SEM/EDS分析了腐蚀产物的形貌和物相组成。结果表明:添加Y2O3可以降低不锈钢的腐蚀速率,添加1‰和2‰的Y2O3,其腐蚀电流密度由9.47 m A·cm-2分别降至7.13和3.73 m A·cm-2。电化学阻抗测试结果表明,316不锈钢在熔融含稀土氧化物的三元硝酸盐中电荷转移电阻值升高,因此耐蚀性得以提高。
Ternary nitrate salts are widely used generation system, but the corrosion damage of the as thermal storage medium for solar thermal power heat storage pipe caused by the molten nitrate salts is significantly severe. In order to improve the corrosion resistance of the pipeline material, the corrosion behavior of 316 stainless steel in mixed molten nitrate-salts KNO3-NaNO2-NaNO3 without and with addition of 1‰ （mass fraction） and 2‰Y2O3 was comparatively studied by means of electrochemical method and SEM/EDS. The results showed that the addition of Y2O3 can reduce the corrosion rate of stainless steel. The corrosion current density decreased from 9.47 mA·cm^2 to 7.13 and 3.73 mA·cm^2 respectively with the addition of 1‰ and 2‰Y2O3 and correspondingly, the transfer resistance of 316 stainless steel in mixed molten nitrate salts was enhanced. It can be concluded that the addition of trace of rare earth element is an effective way to improve the corrosion resistance of 316 stainless steel in the mixed molten nitrate salts.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2017年第1期16-22,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51201131)
西安科技大学培育基金(6310214005)
西安科技大学博士启动金(6310115012)~~
关键词
电化学
316不锈钢
三元硝酸盐
稀土元素
腐蚀
electrochemistry, 316 stainless steel, ternary nitrate salt, rare earth element, corrosion
