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采用原子吸收光谱(AAS),恒电位下电流～时间关系和极化曲线测试等方法研究了304不锈钢、纯铁、铬和镍四种材料在0.1mol/L HCl中的腐蚀行为及哌啶(PD)的缓蚀作用。结果表明:PD可有效地抑制304不锈钢在盐酸中的腐蚀。PD增强Cr在盐酸中的钝化性能,对铁、镍的腐蚀属阴极型缓蚀剂。AAS测试结果表明,304不锈钢的组分元素Fe、Cr、Ni和Mn在盐酸中分别以+2,+3,+2和+2价离子形式溶解,价态不受缓蚀剂的影响。PD对304不锈钢在盐酸中的腐蚀存在“选择性抑制”效应,能显著减缓Cr和Ni的溶解,改变各元素溶解的比例,导致耐蚀组分在电极表面富集。
The corrosion behavior of 304 stainless steel, pure iron, chromium and nickel in 0.1 mol / L HCl and the effect of piperidine ( PD) corrosion inhibition. The results show that PD can effectively inhibit the corrosion of 304 stainless steel in hydrochloric acid. PD enhanced Cr passivation performance in hydrochloric acid, iron, nickel corrosion is a cathode type corrosion inhibitor. The results of AAS test showed that the components of Fe, Cr, Ni and Mn in 304 stainless steel were dissolved in hydrochloric acid as +2, +3, +2 and +2 valence ions, respectively, and the valence was not affected by corrosion inhibitor. PD has a “selective inhibition” effect on the corrosion of 304 stainless steel in hydrochloric acid, which can significantly reduce the dissolution of Cr and Ni, and change the proportion of each element dissolved, resulting in the corrosion-resistant component being enriched on the electrode surface.