采用电化学方法快速研究了不同镍铜质量比和硅含量的海洋环境用耐候钢在3.5% NaCl溶液中的电化学腐蚀行为。结果表明: 在试验范围内, 随着镍铜质量比的增大, 试验钢的自腐蚀电流密度逐渐降低; 当硅含量为低、中水平(质量分数约为0.6%, 0.9%)时, 随着镍铜质量比的增大, 自腐蚀电位逐渐正移; 当硅含量为较高水平(质量分数约为1.2%)时, 随着镍铜质量比的增大, 试验钢的自腐蚀电位变化不大; 硅含量和镍铜质量比对试验钢耐蚀性的影响存在一定的交互作用; 当镍铜质量比较低或硅含量较高时, 试验钢耐蚀性都较差; 只有当钢中碳质量分数在0.9%左右, 镍铜墙铁壁质量比为0.50时, 试验钢的耐蚀性最佳。

Electrochemical techniques were employed to fastly investigate the electrochemical corrosion behavior of weathering steels used in marine environment in 3.5% NaCl solution. The results indicate that with the increase of mass ratio of Ni in Cu (Ni/Cu ratio), the corrosion current density of these steels was always reduced, free corrosion potential shifted in positive direction in low and middle Si content (about 0.6wt% and 0.9wt%), but hardly changed in high Si content (about 1.2wt%). The effects of Ni/Cu ratio and Si content on corrosion resistance of these steels were interactive. The corrosion resistance of test steels was bad at low Ni/Cu ratio, or in high Si content. Only when the Si content was about 0.9 wt% and Ni/Cu ratio was 0.50, the steels had the best corrosion resistance.