<正> 由于高强度钢在水介质中有较强的环境敏感断裂倾向,在海水中能否用锌、铝等阳极性金属涂层进行防护就成为防腐蚀工作者十分关心的问题。现已发现在高强度钢螺拴上无论是电镀锌还是热浸镀锌都增加基材的氧致应力腐蚀断裂敏感性。从而,人们考虑在高强钢构件上用铝保护涂层。最近有在海洋钻井平台的高强钢柱脚和立管上使用喷涂铝层保护的报道。本工作采用锌、铝片与试样偶合或外加恒电位的方法,研究921船用高强度钢在锌、
The effect of thermal-sprayed zinc(TSZ)and aluminium(TSA) on stress corrosion cracking susceptibility of 921 high-strength steel in seawater was studied by slow strain rate technique,with the porosity and local peeling of TSZ or TSA simulated,The test results showed that the potential of the steel coupled to zinc(about-1040mV, SCE)was in the potential range of remarkable hydrogen embrittlem- ent(HE)of the steel in artificial seawater.It would be very dang- erous to have TSZ applied on 921 steel as it might cause HE of the latter.On the other hand,the potential of the steel coupled to alum- inium(about-800mV,SCE)is in the safe and usable range with TSA providing good cathodic protection to the stressed steel component,
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