镉镀层的大气腐蚀行为

采用常规氰化镀镉和无氰镀镉工艺在２０＃钢试样上镀敷镉镀层，并在青岛、江津、武汉和海南万宁大气试验站进行了５．８ａ的大气暴露试验．结果表明江津的镉镀层腐蚀速率最高，青岛与武汉的腐蚀速率接近，海南万宁的腐蚀速率最低．镉镀层不适用于有工业污染的大气环境，对海洋大气环境有较强的防护能力．无氰镀镉层的腐蚀速率与氰化镀镉接近，可以认为在一定条件下无氰镀镉能够代替氰化镀镉工艺用于上述４种典型的大气环境的腐蚀防护．

ATMOSPHERIC CORROSION BEHAVIOR OF CADMIUM COATINGS

Atmospheric corrosion behavior of cadmium coatings on mild steel has been studied. This atmospheric exposure test lasted about 5.8 years at four different climate areas (Qingdao,Wanning,Jiangjin and Wuhan).The results show that corrosion rate of cadmium coatings in Jiangjin is the highest and in Wanning is the lightest, while the corrosion rate in Wuhan is as well as in Qingdao.The corrosion resistance of cadmium coatings is good in marine atmosphere environment, but it is not suitable to be used in industry polluted atmosphere environment. Corrosion rate of non|cyanide cadmium coatings is similar to cyanided ones. It is considered that non|cyanide cadmium coatings can be used for four types of climates instead of cyanide coatings in case of some conditions.