典型氧化铁皮结构电化学腐蚀行为

来源期刊:中南大学学报(自然科学版)2018年第6期

论文作者:曹光明 汤军舰 林飞 李志峰 杨名 刘振宇

文章页码:1366 - 1373

关键词:氧化铁皮;共析组织;电化学腐蚀;极化曲线;耐蚀性

Key words:oxide scales; eutectoid structure; electrochemical corrosion; polarization curves; corrosion resistance

摘    要:利用电化学腐蚀实验系统研究4种典型氧化铁皮结构及基体钢在Cl-环境下的腐蚀行为,通过极化曲线和交流阻抗谱(EIS)对比分析不同氧化铁皮结构的低频容抗弧的半径和电化学阻抗(Ra+Rt),同时借助Tafel外推法拟合得出试样自腐蚀电位和自腐蚀电流变化规律。研究结果表明:不同结构氧化铁皮的耐蚀性从强到弱依次为Ⅳ型氧化铁皮,Ⅲ型氧化铁皮,Ⅱ型氧化铁皮,Ⅰ型氧化铁皮,钢板基体,这是由于Ⅳ型的氧化铁皮(外层为非常薄Fe2O3层,中间为Fe3O4层,靠近基体的为较厚FeO层)表面的孔隙率最低为16.61%,并且Ⅳ型氧化铁皮中的共析组织最少,因此通过控制氧化铁皮结构可以达到提高热轧带钢的常温耐蚀性的目的。

Abstract: The corrosion behavior of four types of oxide scale and substrate were investigated in the condition with Cl- by electrochemical corrosion tests. The low frequency capacitance arc radius and Ra+Rt of the different structures of oxide scale were comparatively analyzed by polarization curves and electrochemical impedance spectroscopy (EIS). The results show that the corrosion resistance of the different structures of oxide scale from strong to weak is followed by type IV, type III, type II, type I, substrate, which is because the structure of type IV consists of outer thin layer of Fe2O3, the intermediate layer of Fe3O4 and inner thick layer of FeO, which has the lowest porosity as 16.61% and the least eutectoid structure. Therefore, the corrosion resistance of hot-rolled plates can be improved by controlling the structure of oxide scales.

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