不同pH值高锰酸钾对不锈钢腐蚀性能影响  

Effect of Different pH Value Potassium Permanganate Solution on Corrosion Property of Stainless Steel

作　　者：宋利君[1] 李新民[1] 刘斌[1] 谢建丽[1] 

机构地区：[1]苏州热工研究院有限公司,江苏苏州215004

出　　处：《核动力工程》2017年第2期84-87,共4页Nuclear Power Engineering

基　　金：中广核集团公司资助项目(No.3100029195)

摘　　要：采用重量法、扫描电子显微镜、动电位极化曲线法研究304L不锈钢在不同pH值高锰酸钾溶液中的腐蚀行为。304L不锈钢经过pH值为1.8的酸性高锰酸钾溶液(NP)氧化后表面腐蚀产物最多,pH值为6.5的高锰酸钾溶液(HP)氧化后表面腐蚀产物最少,pH值为12.5的碱性高锰酸钾溶液(AP)氧化后表面腐蚀产物居中。经过氧化步骤后,试样经过硝酸与抗坏血酸混合还原溶液清洗后都具有金属光泽,微观形貌区别不大。304L不锈钢在HP中的腐蚀电流密度最小,在NP和AP中的腐蚀电流密度大于HP。化学去污清洗工艺中高锰酸钾溶液对不锈钢的腐蚀性最弱,NP、AP对不锈钢基材的腐蚀性强于HP。Corrosion behaviors of 304L stainless steel in different pH value potassium permanganate solution were investigated using the gravimetric analysis method, scanning electron microscope （SEM）, potentiodynamic polarization. Most of the corrosion products are on the surface of 304L stainless steel exposed in acid potassium permanganate（NP, pH=l.8）. A minimum of corrosion products are on the surface of 304L stainless steel exposed in potassium permanganate （HP, pH=6.5）. Corrosion products on the surface of 304L stainless steel exposed in alkalinity potassium permanganate （AP, pH=12.5） are in middle. All specimens through reduction cleaning process of nitric acid and ascorbic acid show metallic luster. And there is no obviously effect on micromorphology of 304L stainless steel exposed in NP, HP and AP solution. The corrosion density ic of 304L stainless steel in HP solution is less than that in NP and AP solution. The results have showed that the corrosion ability of NP and AP solution for 304L stainless steel is more vigorous than that of HP solution in the chemical decontamination process.

关 键 词：304L不锈钢 高锰酸钾 腐蚀 电化学 

分 类 号：TG172[金属学及工艺—金属表面处理]