氨法脱硫浆液中304不锈钢闭塞电池模拟锈层的优选
Optimization of Simulated Rust Layer of 304 Stainless Steel Occluded Cell in Ammonia Desulphurization Slurry
摘 要
构建了氨法脱硫浆液中304不锈钢局部腐蚀发展的闭塞电池模型。通过综合闭塞区离子迁移量、溶液pH和内电极腐蚀速率等对模型中模拟锈层的关键因素进行优选,最终确定最优模拟锈层。结果表明:最优模拟锈层是以滤纸为载体,以混氧化铁与硫酸钙质量比9∶1的混合物为负载物,以0.5%(质量分数)的琼脂溶液为固定成型剂,采用该锈层的闭塞电池模型可较好地模拟局部腐蚀发展过程。
闭塞电池
304不锈钢
模拟锈层
localized corrosion
occluded cell
304 stainless steel
simulated rust layer
Abstract
An occluded cell model of localized corrosion of 304 stainless steel was constructed in ammonia desulphurization slurry. The key factors of simulated rust layer in the model were optimized through the amount of ion migration in the occluded area, the pH of the solution and the corrosion rate of the inner electrode, and finally the optimal simulated rust layer was determined. The results show that the optimal simulated rust layer was based on filter paper as a carrier, a mixture of mixed iron oxide and calcium sulfate with a mass ratio of 9∶1 as a loading material, and a 0.5% (mass fraction) agar solution as a fixed molding agent. The occluded cell model with the optimal simulated rust layer could simulate well the development process of localized corrosion.
中图分类号 TG172 DOI 10.11973/fsyfh-202208005
所属栏目 试验研究
基金项目 国家自然科学基金(21676144)
收稿日期 2020/8/27
修改稿日期
网络出版日期
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引用该论文: YU Chenyue,ZUO Jie,FU Zhihao,LIAN Zhouyang,WEI Wuji. Optimization of Simulated Rust Layer of 304 Stainless Steel Occluded Cell in Ammonia Desulphurization Slurry[J]. Corrosion & Protection, 2022, 43(8): 28
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参考文献
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【10】左景伊,金志强.1Cr18Ni9Ti奥氏体不锈钢在含Cl-及Cl-+NO3-或NO2-溶液中腐蚀裂缝内化学状态之探索 .北京化工大学学报(自然科学版),1985,12(2):33-46.
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