摘要
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Fe3O4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-sizesteel samples in 3% NaCl solution and artificial seawater wasstudied in laboratory. The current of the electric couple betweenalternately dried and wetted sample and fully immersed samplewas measured, and the causes responsible for the cathodic protec-tion of the steel samples at the tide zone were discussed. Resultsindicate that rusted layer consisted of FeOOH and Fe3O4 isformed on the surface of the samples at the tide zone, while rus-ted layer consisted of FeOOH is formed on the surface of the sam-ple in fully immersed zone. This accounted for the difference ofthe corrosion potentials of the samples, leading to protection tothe cathode in the tide zone and decreasing the corrosion rate ofthe long-size steel samples therein.
出处
《材料保护》
CAS
CSCD
北大核心
2009年第11期27-29,共3页
Materials Protection
关键词
E36钢
海水腐蚀
锈层
阴极保护
E36 steel
seawater
corrosion
cathodic protection
