摘要
采用电化学测试、SEM分析等方法,研究了316 L不锈钢在质量分数为30%的浓硝酸溶液及98%硫酸+20 g/L硝酸钾混合液两种钝化剂预处理后的特性,以及在ClO2漂液中的电化学抗腐蚀性能。结果表明,316 L不锈钢在25℃、30%硝酸介质中处理30 min时抗点蚀能力ΔE可达到773 mV,钝化效果较好。EIS图谱表明:316 L不锈钢在ClO2漂液中具有双容抗弧特征,钝化处理容抗弧半径较未钝化的增大,处理后的316 L不锈钢在60℃出现了Warburg阻抗;钝化膜的外层电阻和内层电阻均比未钝化的大。经钝化处理后的316 L不锈钢在ClO2漂液中的受腐蚀速率较未钝化的降低近一半,与钛材相比耐蚀性较差,但能在一定条件下起到减缓腐蚀的作用。
The characteristics of 316 L stainless steel which was pretreated under 30 %（mass fraction） of concentrated nitric acid and 98 % H2SO4＋20 g/L KNO3 mixture respectively and the electrochemical corrosion of 316 L stainless steel in chlorine dioxide bleaching liquid were investigated by electrochemical testing and SEM analysis.From the results it showed that the pitting corrosion resistance ΔE of 316 L stainless steel could be up to 773 mV in the media of 25 ℃,30 % HNO3 for 30 minutes.EIS spectra showed that 316 L stainless steel in chlorine dioxide bleaching liquid had double capacitive reactance arcs characteristics;the radius of capacitance reactance arc increased than those without passivation;the treated 316 L stainless steel at 60 ℃ appeared Warburg impedance;the outer and inner resistances of the passive film was larger than those without passivation.The corrosion rate of 316 L stainless steel by passivation in chlorine dioxide bleaching liquid lowered than the untreated nearly half,but the corrosion resistance is poor compared with titanium,and it can slow corrosion under certain conditions.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期91-95,共5页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
江苏省制浆造纸科学与技术重点实验室开放基金项目(200921)
关键词
316L不锈钢
钝化
二氧化氯漂液
电化学腐蚀
316 L stainless steel
passivation
ClO2 bleaching liquid
electrochemical corrosion
