青岛海域投样初期的24 h内,电联接长尺试样上的阴阳极交错出现,并非潮差区为阴极,海水全浸区为阳极,与公认的氧浓差电池引起潮差区钢样受阴极保护之说不相符.在试验室内用人造海水和3%NaCl溶液模拟潮差区钢样的腐蚀环境,对干湿交替试样与全浸试样间的电偶电流进行了研究,探讨了潮差区钢样受阴极保护的原因.结果表明:潮差区试样表面锈层由FeOOH和Fe_3O_4组成,海水全浸区试样表面锈层由FeOOH组成,这种锈层结构的差异直接产生了试样间的腐蚀电位差,使潮差区的钢样受到了阴极保护,最终导致长尺试样在潮差区的腐蚀速率降低.
The corrosion behavior of long-size steel samples in 3% NaCl solution and artificial seawater was studied in laboratory.The current of the electric couple between alternately dried and wetted sample and fully immersed sample was measured,and the causes responsible for the cathodic protection of the steel samples at the tide zone were discussed.Results indicate that rusted layer consisted of FeOOH and Fe_3O_4 is formed on the surface of the samples at the tide zone,while rusted layer consisted of FeOOH is formed on the surface of the sample in fully immersed zone.This accounted for the difference of the corrosion potentials of the samples,leading to protection to the cathode in the tide zone and decreasing the corrosion rate of the long-size steel samples therein.
参考文献
| [1] | 夏兰廷;黄桂桥;张三平.金属材料的海洋腐蚀与防护[M].北京:冶金工业出版社,2003:11. |
| [2] | 松岛岩;靳裕康.低合金耐蚀钢--开发、发展及研究[M].北京:冶金工业出版社,2004:119. |
| [3] | Evans U R.The Corrosion and Oxidation of Metals[M].London:Edward Aronld,1960:91. |
| [4] | 王凤平;康万利;敬和民.腐蚀电化学原理、方法及应用[M].北京:化学工业出版社,2008:143. |
| [5] | 张万灵,刘建容,黄桂桥,范植金.长尺电联接钢样在海水中的腐蚀行为研究[J].材料保护,2008(06):17-19. |
| [6] | GB 8650-1988.管线钢抗阶梯型破裂试验方法[S].,1988. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%