铜镍合金在我国实海海域的局部腐蚀

研究了B10、B30铜镍合金板材和管材在我国青岛、舟山、厦门和榆林4个海水腐蚀实验站分别暴露1、2、4、8、16 a的局部腐蚀规律.结果表明:全浸区榆林海域、舟山海域和青岛海域均有一定程度的局部腐蚀,其中榆林海域因温度高和海生物附着的共同作用导致铜镍合金的局部腐蚀最严重;而厦门海域对铜镍合金的局部腐蚀有一定的减缓作用,使铜镍合金板材没有局部腐蚀发生;各海域对铜镍合金的腐蚀作用基本均以沿晶腐蚀为主,但程度不同;暴露16 a,在厦门海域B30合金的Ni、Mn和Fe含量比青岛海域和榆林海域B30合金的Ni、Mn和Fe含量高;提高B30合金的耐蚀性,是厦门海域的铜镍合金板材基本不发生局部腐蚀的内在原因.

Localized corrosion of Cu-Ni alloy in China marine

Localized corrosion of B10 and B30 Cu alloy plates and tubes in Qingdao marine, Zhoushan marine, Xiamen marine and Yulin marine of China for 1, 2, 4. 8 and 16 a was studied. The results indicate there is local corrosion on Cu-Ni alloys in the immersion zone of Yulin marine, Zhoushan marine and Qingdao marine. The specimens in Yulin marine are corroded most seriously due to high temperature and marine-living adhesion. But the seawater of Xiamen inhibits the pitting corrosion of Cu-Ni alloys, so that no pitting corrosion is observed on Cu-Ni alloy plates tested there. There is mainly intergranular corrosion with different extent on Cu-Ni alloys in marine. The contents of Ni, Mn, Fe is higher in Xiamen marine than those in Qingdao marine and Yulin marine, which improves the anticorrosion of B30 alloy. This is internal reason that Cu-Ni alloy plates has no pitting corrosion in Xiamen marine.