铜及铜合金在我国实海海域暴露16年局部腐蚀规律

本项目研究了19种铜及铜合金在我国青岛、舟山、厦 门、榆林四个海水腐蚀试验站暴露1、2、4、8、16年的局部腐蚀规律.暴露实验表明，榆林站全浸区因温度高和海生物附着共同作用是铜合金表现一定的局部腐蚀现象；舟山海域因为高流速的含泥沙海水的冲刷作用，也使铜合金发生局部腐蚀；厦门海域对铜合金的局部腐蚀有一定的减缓作用，使铜合金板材没有局部腐蚀发生，但厦门海域的这种减缓作用有一定的限度；青岛海域全浸区的局部腐蚀程度不高，但暴露后期在潮差区铜合金的局部腐蚀比全浸区严重.

LOCALIZED CORROSION OF COPPER AND ITS ALLOYS IN SEAWATER AT FOUR TEST SITS ALONG CHINA COAST FOR 16 YEARS

The regulation of localied corrosion of 2 kinds of copper and 17 kinds of copper alloys exposed in seawater at test sites of Qingdao,Zhoushan,Yulin and Xiamen for 16 years has been studied.Results show that during immersion in the seawaters,copper alloys suffered from pitting corrosion due to high temperature and marine living adhesion at Yulin,and due to higher flow velocity of seawater containing sand at Zhoushan.However,the seawater at Xiamen seems to prohibit pitting corrosion of copper alloys,so that no pitting corrosion was observed for copper alloy plates tested there.The copper alloys suffered from more serious pitting corrosion in the mean tide zone than that in the immersion zone at Qingdao during the later exposure stage.