合金元素对铸造Fe-Cr铁素体不锈钢耐浓硫酸腐蚀性能的影响
Effect of Alloying Elements on Corrosion Resistance of Foundry Fe-Cr Ferritic Stainless Steels in Concentrated Sulfuric Acid
摘 要
采用电化学技术、浸泡腐蚀及能谱分析等研究了合金元素对铸造Fe-Cr铁素体不锈钢耐浓硫酸腐蚀行为的影响。结果表明：随铬含量的增加，Fe-Cr合金的耐浓硫酸腐蚀性能增强，单一的铬合金化不能使Fe-Cr合金在60℃，98% H2SO4中自钝化；钼能促进Fe-Cr25-Mo合金的钝化和自钝化，随钼含量的增加，Fe-Cr25-Mo合金的耐浓硫酸腐蚀性能增强；辅助合金元素镍、铜可促进Fe-Cr25Mo2合金的钝化和自钝化，而钛、铌的影响不大。
浓硫酸
电化学技术
合金元素
ferritic stainless steel
concentrated sulfuric acid
electrochemical technique
alloying element
Abstract
The effects of alloying elements on the corrosion behavior of foundry Fe-Cr ferritic stainless steels in concentrated sulfuric acid were studied by electrochemical techniques, immersion corrosion and energy dispersive spectroscopy (EDS). The results show that the corrosion resistance of Fe-Cr alloys in concentrated sulfuric acid improved with the increase of Cr content. However, the single Cr alloyed Fe-Cr alloy was unable to reach self-passivation in 98% H2SO4 at 60℃. Mo addition enhanced the corrosion resistance and promoted the passivation and self-passivaiton of Fe-Cr25-Mo alloys. Elements Ni and Cu can also promoted the passivation and self-passivation of Fe-Cr25Mo2 alloys, whereas Ti and Nb only had a little influence on the passivation.
中图分类号 TG174 DOI 10.11973/fsyfh-201710005
所属栏目 试验研究
基金项目
收稿日期 2016/3/20
修改稿日期
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引用该论文: OUYANG Minghui,LIU Huanan,YE jixuan. Effect of Alloying Elements on Corrosion Resistance of Foundry Fe-Cr Ferritic Stainless Steels in Concentrated Sulfuric Acid[J]. Corrosion & Protection, 2017, 38(10): 761
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