论文部分内容阅读
本文采用恒电位法用模拟闭塞电池研究902、схл—4、907和921四种船体用低合金钢在人造海水中的局部腐蚀行为。随着阳极溶解的发生,闭塞区内溶液的pH值随时间迅速下降,在50小时内最低可达2.7左右。阳极溶解相应的电量与溶液的pH值呈函数关系。Cl~-浓度在闭塞区内增加,最多可达40％左右。比较四种钢材在相同时间内阳极溶解量,其由大到小的次序为902→схл—4→907→921。这与我们实船调查的上述钢材耐局部腐蚀性能的结果基本上一致。
In this paper, we use the potentiostatic method to simulate the local corrosion behavior of four types of low alloy steels for marine 902, схл-4, 907 and 921 in artificial seawater. With the onset of anodic dissolution, the pH of the solution in the occluded area decreases rapidly over time, reaching a minimum of about 2.7 in 50 hours. The amount of anodic dissolution corresponding to the pH value of the solution as a function of. Cl ~ - concentration in the occlusion zone increased up to 40%. Compare the four kinds of steel in the same time the anodic dissolution, the descending order of 902 → схл-4 → 907 → 921. This is consistent with the results of the localized corrosion resistance of the above steels investigated by our real ship.