Effects of Different Oxidants on HCl-based Pickling Process of 430 Stainless Steel

被引:0
|
作者
Qiong XIE [1 ]
Pei-yang SHI [1 ]
Cheng-jun LIU [1 ]
Mao-fa JIANG [1 ]
机构
[1] Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education,Northeastern University
关键词
oxidant; 430stainless steel; HCl-based pickling; polarization curve; electrochemical impedance spectroscopy;
D O I
暂无
中图分类号
TG337.5 [不锈钢轧制]; TG178 [各种金属及合金的腐蚀、防腐与表面处理];
学科分类号
080201 ; 080503 ;
摘要
To shorten the time required for the pickling process and to enhance the quality of ferritic stainless steel plates,the effects of oxidants including hydrogen peroxide(H2O2),potassium permanganate(KMnO4),and potassium chlorate(KClO3)on the pickling behavior in HCl-based electrolyte as well as the surface quality of hot-rolled and blasted 430 stainless steel(430-SS)were studied.Experiments were conducted using mass-loss tests,microstructure analyses,potentiodynamic polarization curves,and electrochemical impedance spectroscopy measurements.The results showed that the addition of oxidants substantially accelerated the pickling process of 430-SS by enhancing the cathodic reaction rate and reducing the charge transfer resistance.In electrolytes comprising 5-8mass% HCl at a temperature of 40-60 ℃ and at the same concentration within the range from 0to 2mass%,H2O2 was demonstrated to be superior to KMnO4 and KClO3in accelerating the pickling process.The surface quality of 430-SS pickled in the presence of H2O2 was better than those of specimens pickled in the presence of KMnO4 and KClO3 when the removal of the oxide layer,intergranular corrosion,and surface roughness were collectively considered.When 1mass% H2O2 was added,the mass loss rate of 430-SS was increased by 629%and no residual oxide layer or intergranular corrosion was observed on the surface of the steel;in addition,the roughness was only 1.7μm.H2O2 was determined to be a better oxidant than KMnO4 and KClO3 when the pickling process,surface quality,solution recycling,and environment protection were considered as a whole.
引用
收藏
页码:778 / 783
页数:6
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