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将Q235碳钢在流动海水中浸泡280 d,利用失重法和多种腐蚀电化学方法研究了其在浸泡过程中的腐蚀规律.结果表明,与静止海水浸泡相比,在流动体系长时间浸泡后,电极表面几乎不存在疏松的黄色锈层,而被一层致密的黑色腐蚀产物所覆盖;失重法测得的腐蚀速率随腐蚀时间延长呈现减小的趋势,并最终趋于稳定,与静止海水相比,流动海水中的腐蚀速率高出约1倍;电化学方法测得的腐蚀速率则随浸泡时间的延长而增大,与失重法的结果之间存在较为明显的偏差,并且浸泡时间越长,这一偏差越明显.长期浸泡后,碳钢表面的锈层对电化学测试结果产生影响,是导致电化学方法不能准确评估腐蚀速率的原因.
The Q235 carbon steel was immersed in flowing sea water for 280 days, and the corrosion of the Q235 carbon steel was studied by weight loss method and various electrochemical methods. The results show that compared with static seawater immersion, , There is almost no loose yellow rust layer on the surface of the electrode, which is covered by a layer of dense black corrosion products. The corrosion rate measured by weight loss method decreases with the increase of corrosion time and finally tends to be stable. The corrosion rate in flowing seawater is about 1 time higher than that in flowing seawater; the corrosion rate measured by electrochemical method increases with the soaking time, and there is a significant deviation from the result of weight loss method, and the immersion time The more obvious the deviation is.The long-term immersion, the rust layer on the surface of carbon steel on the electrochemical test results have an impact on the electrochemical method can not accurately estimate the corrosion rate.