Q345D低合金钢在海洋潮差区的腐蚀规律及电化学行为研究

发布时间：2018-06-03 03:23

本文选题：QD低合金钢 + 腐蚀　；参考：《机械工程学报》2016年20期

【摘要】：通过在青岛海域2年实海挂片暴露试验研究Q345D低合金钢和对比材料Q235B普碳钢在潮差区的腐蚀行为。试验结果表明,Q345D钢在实海潮差区1年和2年周期的平均腐蚀速率都小于Q235B钢,且两种钢锈层组成和结构基本类似,但Q345D钢表面锈层较厚,且更致密均匀。通过室内模拟海水周浸腐蚀试验研究两种钢的初期腐蚀行为,通过腐蚀数据的回归拟合分析得出,在腐蚀起始阶段,Q345D钢与Q235B钢的腐蚀倾向差别不大,但随着周浸时间的延长,腐蚀速率逐渐降低,且Q345D钢表现出比Q235B更好的耐全面腐蚀性能。宏观电化学阻抗谱和微区阻抗谱测试结果也证实,Q345D低合金钢形成的腐蚀产物膜层具有比Q235B钢更高的膜层电阻,且能够在更短时间内形成稳定的腐蚀产物膜层。
[Abstract]:The corrosion behavior of Q345D low alloy steel and contrast material Q235B plain carbon steel in the tidal zone was studied by exposure test in Qingdao sea area for 2 years. The results show that the average corrosion rate of Q345D steel in the real tidal zone is lower than that of Q235B steel for 1 and 2 years, and the composition and structure of the rust layer of the two steels are similar, but the rust layer on the surface of Q345D steel is thicker and more compact and uniform. The initial corrosion behavior of the two steels was studied by simulated seawater cyclic immersion corrosion test in laboratory. Through regression fitting analysis of corrosion data, it was concluded that the corrosion tendency of Q345D steel and Q235B steel was not different from that of Q235B steel at the initial stage of corrosion, but with the prolongation of the cycle leaching time, the corrosion behavior of the two steels was studied. The corrosion rate of Q345D steel decreased gradually, and the overall corrosion resistance of Q345D steel was better than that of Q235B. The results of macroscopic electrochemical impedance spectroscopy and micro-area impedance spectroscopy also confirmed that the corrosion product film formed by Q345D low alloy steel has higher film resistance than Q235B steel and can form a stable corrosion product film in a shorter time.
【作者单位】：北京科技大学腐蚀与防护中心;北京科技大学腐蚀与防护教育部重点实验室;中国科学院宁波材料技术与工程研究所;
【基金】：国家自然科学基金(51271031) 国家重点基础研究发展计划(973计划,2014CB643300) 国家科技基础条件平台(2005DKA10400)资助项目
【分类号】：TG172

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