通过镀锌钢在全国13个大气腐蚀试验站8a的现场暴露试验,观察了镀锌钢的表面形貌,进行了表面评级,测试了腐蚀速率,并计算了碳钢与镀锌钢的腐蚀速率比值.结果表明:所有镀锌钢板均出现表面变暗的现象,在拉萨、敦煌等站其表面变化较小,在青岛、江津等站其腐蚀较为严重,表面存在一定程度的锈蚀,在万宁站其表面锈蚀最严重;在13个站点镀锌钢的腐蚀速率由大到小依次为万宁＞武汉＞青岛＞沈阳＞广州＞江津＞北京＞琼海＞西双版纳＞库尔勒＞漠河＞敦煌＞拉萨;通过计算,碳钢与镀锌钢的腐蚀速率之比为9.2～2 000.0.在实际应用中,镀锌钢在不同环境中的厚度应不同.
Galvanized steels were exposed in 13 atmospheric sites in China for 8 a,the surface morphology was observed,surface rating was carried out,corrosion rate was tested and the corrosion rate ratio of carbon steel to galvanized steels was calculated.The results showed that the surface of all galvanized steels got dark,the change was little in Lasa and Dunhuang,but rusting appeared in Qingdao and Jiangjin and the most serious corrosion appeared in Wanning.The order of corrosion rate in 13 sites was:Wanning ＞ Wuhan ＞ Qingdao ＞ Shenyang ＞ Guangzhou ＞ Jiangjin＞Beijing＞Qionghai＞Xishuangbanna＞Kuerle＞Mohe＞Dunhuang＞Lasa.By calculating,the corrosion rate ratio of carbon steel to galvanized steels was between 9.2 to 2 000.0.In practical application,the thickness of galvanized steel should be different for the different environmental conditions.
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