氯离子和直流电流密度对X65钢的腐蚀研究

发布时间：2018-04-09 14:09

本文选题：氯离子　切入点：直流杂散电流　出处：《表面技术》2017年08期

【摘要】：目的通过浸泡实验和腐蚀图像表征方法研究氯离子和直流杂散电流共同作用下X65钢的腐蚀特征。方法通过浸泡实验,在不同氯离子浓度和直流电流密度的共同作用下,通过失重法计算X65钢的均匀腐蚀速率。通过三维显微镜对浸泡后的腐蚀形貌进行观察,确定其主要腐蚀形态和发展规律。结果在不同的氯离子浓度下,X65钢的均匀腐蚀速率基本不变,误差主要来自于腐蚀产物清洗不彻底和环氧树脂吸水的差异性。而腐蚀速率与直流电流密度成正比,氯离子主要作用是使试片形成不同的局部腐蚀特征,破坏了试片表面的均匀腐蚀,而加剧了局部腐蚀,但对整体的腐蚀速率基本没有影响。结论引起管道腐蚀失重的主要因素为流出管道的直流电流密度,而与所处环境无关。低氯离子浓度是导致局部腐蚀的主要原因,随着氯离子浓度的增大,腐蚀逐渐向均匀腐蚀转变。直流电流密度造成的腐蚀以均匀腐蚀为主。
[Abstract]:Aim to study the corrosion characteristics of X65 steel under the action of chloride ion and DC stray current by immersion test and corrosion image characterization.Methods the uniform corrosion rate of X65 steel was calculated by weightlessness method under the combined action of different chloride concentration and DC current density.The corrosion morphology after immersion was observed by three dimensional microscope, and the main corrosion morphology and development law were determined.Results the uniform corrosion rate of X65 steel was almost unchanged at different chloride concentration, and the error was mainly due to the incomplete cleaning of corrosion products and the difference in water absorption of epoxy resin.The corrosion rate is directly proportional to the DC current density. The main action of chloride ion is to make the specimen form different local corrosion characteristics, destroy the uniform corrosion on the surface of the test piece, and aggravate the local corrosion, but it has no effect on the overall corrosion rate.Conclusion the main factor of corrosion weightlessness of pipeline is the DC current density of outlet pipe, but it has nothing to do with the environment.Low chloride concentration is the main cause of local corrosion. With the increase of chloride concentration, corrosion gradually changes to uniform corrosion.The corrosion caused by DC current density is mainly uniform corrosion.
【作者单位】：浙江金衢丽天然气有限公司;
【分类号】：TG178

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