不同涂层处理的汽车紧固件用ST12冷轧钢与SS400热轧钢的电偶腐蚀行为研究

赵晓宏, 郭泉忠, 杜克勤, 郭兴华, 王勇

Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings

ZHAO Xiaohong, GUO Quanzhong, DU Keqin, GUO Xinghua, WANG Yong

表1 动电位极化曲线的拟合结果

Table 1 Fitting results of potentiodynamic polarization curves

Sample Ec / V jc / 10-6 Acm-2 Rp / 103 Ωcm2 SS400 -0.66 25.9 0.40 ST12 with silvery Zn/Al coating -1.04 6.36 3.32 ST12 with black Zn/Al coating -0.94 2.89 32.6 ST12 with silvery Zn/Ni electroplating -0.82 2.73 6.65 ST12 with black Zn/Ni electroplating -0.80 2.61 4.29