Experimental Studies on Corrosion Behaviour of Ferritic Stainless Steel in HCl Based Solution
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摘要: 以抛丸后的热轧430铁素体不锈钢板为原料,通过酸洗模拟试验,结合腐蚀失重测定、微观形貌分析、极化曲线及交流阻抗谱测试,研究了氧化剂氯酸钾(KClO3)对铁素体不锈钢盐酸基酸洗过程及板面质量的影响作用规律。试验结果表明:KClO3可以通过加速阴极反应速率,减小电荷转移电阻,从而明显加速铁素体不锈钢的酸洗进程,但过量加入时易产生点蚀倾向。KClO3可以作为适用于铁素体不锈钢盐酸基酸洗盐酸工艺的合理氧化剂,其适宜的加入量为1%。Abstract: The effect of potassium chlorate (KClO3) as oxidants on pickling behaviour in HCl-based electrolyte and the surface quality of original hot-rolled and blasted 430 stainless steel (430-SS) were studied,by means of weight-loss tests,microstructure analyses,potentiodynamic polarization curves and electrochemical impedance spectroscopy measurements. The results showed significantly accelerated pickling process for 430-SS happened by adding KClO3 through enhanced cathodic reaction rate and reduced Rt,with pitting corrosion when excess KClO3 was added. KClO3 is a proper oxidant for pickling in HCl-based electrolyte of 430-SS,with reasonable addition of 1%.
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Key words:
- ferritic stainless steel /
- HCl pickling /
- corrosion behavior /
- polarization curve /
- EIS /
- KClO3
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