Effect of some anions on the anodic dissolution of Delta-52 steel in sulphuric acid solutions

Surface Technology Pub Date : 1985-03-01 DOI:10.1016/0376-4583(85)90074-3

S.S. Abd El Rehim, M.Sh. Shalaby, S.M. Abd El Haleem

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引用次数: 3

Abstract

The anodic dissolution of hot-rolled Delta-52 steel (an Egyptian product) was studied potentiodynamically in H₂SO₄ solutions of various concentrations. The rate of dissolution increases with increasing acid concentration. The effects of the addition of Cl^-, Br^- and I^- anions on the dissolution kinetics of the electrode in 0.1 M H₂SO₄ were investigated. The data reveal that the Cl^- ion participates in the anodic dissolution while both the Br^- and I^- ions decrease the steel dissolution reaction.

The addition of NO₂^-, CrO₄^3- anions to the H₂SO₄ solution inhibits the anodic reaction of steel dissolution. The dissolution current density j in the Tafel region varied with the concentration C_inh of the added anions according to the relation. log j=a−blogC_inh where a and b are constants.

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某些阴离子对Delta-52钢在硫酸溶液中阳极溶解的影响

研究了埃及产热轧Delta-52钢在不同浓度硫酸溶液中的阳极溶解电位动力学。溶解速率随酸浓度的增加而增加。研究了Cl-、Br-和I-阴离子的加入对电极在0.1 M H2SO4中溶解动力学的影响。结果表明，Cl-离子参与了钢的阳极溶解反应，而Br-和I-离子均抑制了钢的阳极溶解反应。在H2SO4溶液中加入NO2-、CrO43-阴离子抑制了钢溶解的阳极反应。Tafel区的溶解电流密度j随加入阴离子的浓度Cinh而变化。log j=a−blogCinh，其中a和b为常数。

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Surface Technology

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