表面电镀钯膜的316L不锈钢在高温稀硫酸/硫酸盐溶液中的耐蚀性
Corrosion Properties of 316L Stainless Steel with Electroplated Pd Coating in Dilute Sulfuric Acid with High Concentration of SO2-4 at High Temperature
摘 要
采用电化学极化与电化学阻抗谱及浸泡试验等方法, 研究了316L不锈钢表面电镀钯膜在94 ℃的10% H2SO4+250 g/L Na2SO4+16 g/L ZnSO4溶液中的耐蚀性能。结果表明, 电镀钯使不锈钢的腐蚀电位大幅提高700 mV, 促进了不锈钢表面的钝化, 使其耐蚀性能得到明显提高。当体系中加入一定浓度的氯离子(100~1 000 mg·L)后, 镀钯试样的自腐蚀电位仍然处于316L不锈钢的钝化电位区间, 阻抗值明显下降, 其腐蚀速率比不锈钢试样的腐蚀速率显著下降, 表明含氯条件下表面镀钯仍可明显提高不锈钢的耐蚀性能。
电镀钯
高温硫酸
硫酸根
氯离子
316L SS
electroplating palladium film
high temperature sulfuric acid
SO42-
Cl-
Abstract
A thin Pd film was deposited on the 316L stainless steel sample by electroplating. Polarization measurement, electrochemical impedance measurement and weight loss test were conducted to study the corrosion resistance of 316L SS with Pd film in a 10% H2SO4 + 250 g/L Na2SO4 + 16 g/L ZnSO4 solution (94 ℃). The results showed that the corrosion potential was greatly inereased by 700 mV, and the surface passivation was promoted, so the corrosion resistance of the steel was improved. When the solution contained some concentrations of Cl- (from 100 mg/L to 1000 mg/L), the corrosion potential of the steel sample with Pd film was still in the passivation range of 316L SS, the impedance was decreased and the corrosion rate was lower apparently compared with that of 316L SS, indicating that the 316L SS steel could remain very good corrosion resistance under the Cl- condition after electroplated with Pd film.
中图分类号 TG174
所属栏目 试验研究
基金项目
收稿日期 2013/5/8
修改稿日期
网络出版日期
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备注唐聿明(1971-),副教授,博士,从事材料的腐蚀研究,
引用该论文: TANG Yu-ming,WANG Chao-li,JU Peng-fei,ZHAO Xu-hui,ZUO Yu. Corrosion Properties of 316L Stainless Steel with Electroplated Pd Coating in Dilute Sulfuric Acid with High Concentration of SO2-4 at High Temperature[J]. Corrosion & Protection, 2014, 35(3): 248
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参考文献
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【8】XU L,ZUO Y,TANG J L,et al. Chromium-palladium films on 316L stainless steel by pulse electrodeposition and their corrosion resistance in hot sulfuric acid solution[J]. Corrosion Science,2011,53(11):3788-3795.
【9】TANG J L,ZUO Y. Study on corrosion resistance of palladium films on 316L stainless steel by electroplating and elctroless plating[J]. Corrosion Science, 2008, 50(10):2873-2878.
【10】TANG J L,ZUO Y,TANG Y M,et al. Composition and corrosion resistance of palladium film on 316L stainless steel by brush plating[J]. Transactions of Nonferrous Metals Society of China,2012,22(1):97-103.
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