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中文摘要：
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。
英文摘要：
Corrosion behavior of the Cr modified HRB400 carbon steel rebar in 2%NaCl solution was investigated by means of dry/wet cyclic corrosion test, potentiodynamic polarization and elec- trochemical impedance spectroscopy. Results show that the open circuit potential moved to higher value in positive direction; the corrosion current density decreased; the polarization resistance in- creased and the corrosion rate declined for the Cr modified steel in comparison to HRB400 steel. After dry/wet cyclic corrosion test for 72 h, the HRB400 steel exhibited an uniform corrosion mor- phology, however the Cr modified steel rebar exhibited feaaxres of local corrosion. Anyhow, the addition of Cr can significantly reduce the uniform corrosion rate of HRB400 steel rebar.
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