论文部分内容阅读
分别采用失重法与电化学方法(包括极化曲线、线性极化法和电化学阻抗技术)研究了碳钢在海水中浸泡48周的腐蚀规律。结果发现,短期浸泡在海水中的碳钢,表面生成的腐蚀产物薄且疏松,长期浸泡后,锈层逐渐分为两层:外锈层薄且疏松,内锈层厚且致密。短期浸泡,失重法与电化学方法得到的腐蚀规律一致,腐蚀速度逐渐减小并且数值相近,此时电化学方法可以用来准确的估算碳钢的腐蚀速度。长期浸泡,电化学方法测定的腐蚀速度转为逐渐增大,偏离了失重结果,并且锈层越厚偏差越大,此时电化学方法会过高估算腐蚀速度。
The corrosion of carbon steel immersed in seawater for 48 weeks was investigated by weight loss method and electrochemical method (including polarization curve, linear polarization and electrochemical impedance spectroscopy). The results showed that the short-term immersion of carbon steel in seawater resulted in thin and loose corrosion products on the surface. After long-term immersion, the rust layer gradually divided into two layers: the outer rust layer was thin and loose, the inner rust layer was thick and dense. Short-term immersion, weight loss method and electrochemical corrosion of the law obtained consistent, the corrosion rate gradually reduced and the numerical similar to the electrochemical method can be used to accurately estimate the corrosion rate of carbon steel. Long-term immersion, the electrochemical method of determination of the corrosion rate to gradually increase, deviate from the results of weight loss, and rust the greater the greater deviation, the electrochemical method will overestimate the corrosion rate.