低碳耐候冷镦钢的电化学腐蚀行为  

Electrochemical Corrosion Behavior of Low-Carbon Weathering Cold Heading Steels

作　　者：李战卫 于学森 王金涛 张宇 LI Zhanwei;YU Xuesen;WANG Jintao;ZHANG Yu(Institute of Research of Iron&Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,张家港215625

出　　处：《腐蚀与防护》2024年第8期17-21,共5页Corrosion & Protection

摘　　要：通过动电位极化曲线和电化学阻抗谱,以普通低碳冷镦钢为对比材料,研究了低碳耐候冷镦钢的电化学腐蚀行为。结果表明:与普通低碳冷镦钢相比,低碳耐候冷镦钢具有较高的自腐蚀电位、较低的自腐蚀电流密度和较大的电荷转移电阻,耐蚀性能显著提高;随耐候指数增大,该钢的自腐蚀电位逐渐提高,电荷转移电阻逐渐增大,自腐蚀电流密度逐渐降低。该钢的自腐蚀电位与耐候指数呈线性正相关,当耐候指数大于6.388时,电荷转移电阻急剧增大。The electrochemical corrosion behavior of the low-carbon weathering cold heading steels was investigated by dynamic potential polarization curves and electrochemical impedance spectroscopy,with conventional low-carbon cold heading steel as a contrast material.The results show that compared with conventional cold heading steel,the low-carbon weathering cold heading steels had higher free corrosion potential,lower free corrosion current density and higher charge transfer resistance,and thus the corrosion resistance improved obviously.With the increase of weatherability index,the free corrosion potential and charge transfer resistance gradually increased,and the free corrosion current density gradually decreased for the low-carbon weathering cold heading steels.A linear positive correlation between free corrosion potential and weatherability index was found for the steels,and the charge transfer resistance of the steels increased rapidly when the weatherability index was greater than 6.388.

关 键 词：耐候冷镦钢 电化学 极化曲线 电化学阻抗谱(EIS) 耐候指数 

分 类 号：TG174.2[金属学及工艺—金属表面处理]