镍合金在天然海水中的腐蚀行为

目前,尚未见到关于镍合金在我国海域的腐蚀行为的报道,这给镍合金在海水中的应用带来不便,为此,通过天然海水暴露试验,获得了9种镍合金在青岛海域全浸区、潮汐区暴露1年、2年、4年、7年的腐蚀结果,讨论了它们在海水中的腐蚀行为.结果表明,镍合金在海水中的耐蚀性相差很大.NS334,NS335,NS336,GH3128在海水中有很好的耐蚀性,Hastelloy-G和GH181有好的耐蚀性.镍合金在潮汐区的耐蚀性比全浸区好.机械划伤、加工残余应力增加镍合金对点蚀的敏感性.海生物污损对NS112和NS312在海水中的腐蚀有明显影响.添加Cu,Cr,Mo,W能提高镍合金在海水中的耐蚀性.该试验结果为实际应用提供了参考.

Corrosion Behavior of Nickel Alloy in Natural Seawater

Corrosion behavior of nickel alloy in Chinese sea area was still not reported at present,which resulted in inconvenience for its application in seawater.Corrosion results of 9 types of nickel alloys in Qingdao sea area of China for 1,2,4 and 7 years were obtained by natural seawater exposure tests,and their corrosion behaviors were discussed.The corrosion resistance of nickel alloys in seawater is quite different.Corrosion resistances of NS334,NS335,NS336 and GH3128 in seawater are excellent,and Hastelloy G and GH181 are good.Scratch and residual stress increase the susceptibility of nickel alloys to pitting.Corrosion resistances of nickel alloys in tidal zone are better than in fully immersion zone.Effcts of halobiotic fouling on the corrosion of NS112 and NS312 in seawater are notable.Adding of Cu,Cr,Mo,W can enhance the corrosion resistance of nickel alloys in seawater.The results provide references for practice application.