船舶用碳钢表面镀Zn及其耐蚀性

CORROSION OF GALVANIZED CARBON STEEL FOR WATERCRAFT

为了提高船舶舱内碳钢制品的使用寿命 ,以 2 0 #碳钢为例对其表面采用无氨、无氰溶液镀Zn以及钝化处理 .研究了镀Zn试样在中性盐雾以及含有机物质气氛中的耐蚀性能 .结果表明 :有机物质气氛是造成船舶舱内碳钢制品腐蚀的主要原因 ,而无氨、无氰溶液进行镀Zn能在很大程度上解决碳钢表面的电化学腐蚀问题 .

In order to enhance the service lifetime of products made of carbon steel in the cabin of watercraft,the 20# carbon steel is galvanized in a bath without ammonia or cyanogen and then a post passivation disposal is carried out.In order to compare the corrosion performance of the galvanized steel with the are steel in the relevant service enviroment,corrosion tests of the two materials were conducted out by salt spraying and in a simulated atmosphere made of air with some gases organic substances,which were detected in the carbon of a watercraft.Results of experiment indicate that atmospheres with organic compounds is the main corrosives for inducing corrosion to the producs made of carbon steel in the cabin of watercraft,and the galvanization in the bath without ammonia or cyanogens can provide not only the favorable capability of decoration but also the ability of preventing the steel products from electrochemical corrosion to a great extent.