镉镀层和锌镀层是海洋工程技术人员经常要选用的,它们都是保护性的镀层。然而,不同的使用环境。镉镀层和锌镀层的防护性能也不同,我们通过在海水、海洋大气和工业大气中的试验证实了这一点。在海水中镉镀层较锌镀层耐蚀,这一点通过在渤海海水中的237天挂片试验得到了验证。镉镀层在这样一段时间的海水浸泡中未有腐蚀现象,试片仍光亮,彩色钝化膜鲜艳;而锌镀层却有腐蚀,最大腐蚀面 Cadmium plating and zinc plating are often used offshore engineering technicians, they are protective coating. However, different usage environments. The protective properties of the cadmium and zinc coatings are also different, as we have demonstrated by experiments in seawater, the marine atmosphere and the industrial atmosphere. Cadmium plating is more corrosion resistant than zinc plating in seawater, as evidenced by the 237-day coupon test in Bohai Sea water. The cadmium plating did not corrode in seawater immersion for a period of time, the test piece was still bright and the color passivation film was vivid. However, the zinc coating had corrosion and the maximum corrosion surface