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应用动电位极化、电化学阻抗谱、周浸腐蚀实验的方法研究了HRB400普通碳钢钢筋和两种Cr合金化的低合金钢筋在2%Na Cl溶液中的腐蚀行为。结果表明:相比HRB400钢筋,Cr合金化的钢筋的开路电位明显正移,Cr加入提高了钢的热力学稳定性;随着Cr含量的增加,钢筋的自腐蚀电流密度减小,极化电阻增大,Cr合金化的钢筋具有相对较小的电化学腐蚀速率;周浸加速腐蚀72 h后,HRB400钢筋以均匀腐蚀为主,Cr合金化的钢筋以局部腐蚀为主,添加Cr可以显著降低HRB400钢筋的均匀腐蚀速率。
The corrosion behavior of HRB400 plain carbon steel and two Cr alloyed low alloyed steels in 2% NaCl solution was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy and cyclic immersion test. The results show that the open circuit potential of Cr-alloyed steel is significantly positive compared with that of HRB400, and the addition of Cr improves the thermodynamic stability of the steel. With the increase of Cr content, the corrosion current density of the steel decreases, the polarization resistance increases Large and Cr alloying steel has a relatively small electrochemical corrosion rate; after immersion accelerated corrosion for 72 h, HRB400 rebar is dominated by uniform corrosion, while Cr alloying rebar is dominated by localized corrosion. Adding Cr can significantly reduce HRB400 The uniform corrosion rate of steel.