不同环境介质中X70钢的交流腐蚀行为及腐蚀产物膜层分析

发布时间：2018-05-11 15:14

本文选题：X钢 + 交流腐蚀　；参考：《金属学报》2017年08期

【摘要】：通过交流腐蚀模拟实验考察了X70钢在4种环境介质中的交流腐蚀行为,获得了X70钢在4种介质中的腐蚀速率K_d。结果表明,腐蚀速率K_(d(NaCl))K_(d(Na_2SO_4))K_(d(CaCl_2))K_(d(MgCl_2))。采用SEM、EDS和XRD对腐蚀产物膜的表面/截面微观形貌、元素和物相成分进行了表征与分析,探讨了X70钢在相同交流电流密度下,不同介质中腐蚀速率差异的原因:在Na_2SO_4和NaCl介质中,腐蚀产物膜比较疏松,侵蚀性离子SO_4~(2-)和Cl~-的存在会加速X70钢的腐蚀,Na~+不会影响腐蚀产物膜的形成;在MgCl_2和CaCl_2介质中,Ca~(2+)和Mg~(2+)的存在有利于形成保护性好的致密腐蚀产物膜。
[Abstract]:The AC corrosion behavior of X70 steel in four kinds of environmental media was investigated by AC corrosion simulation experiment. The corrosion rate of X70 steel in four kinds of medium was obtained. The results show that the corrosion rate is K / S / K / C / K / T / K / T / K / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C The surface / cross section morphology, element and phase composition of corrosion product film were characterized and analyzed by means of SEM-EDS and XRD. The reasons for the difference of corrosion rate of X70 steel in different medium under the same AC current density were discussed: in Na_2SO_4 and NaCl medium, the corrosion rate of X70 steel was analyzed. The corrosion product films are looser. The presence of corrosive ions so _ 4O _ 2) and Cl ~-can accelerate the formation of corrosion products films of X70 steel, and the existence of MgCl_2 and CaCl_2) and Mg~(2) is beneficial to the formation of protective dense corrosion product films.
【作者单位】：北京科技大学新材料技术研究院腐蚀与防护中心;
【基金】：国家自然科学基金项目No.51401017 国家重点研发计划项目Nos.2016YFC0802101和2016YFC0802103~~
【分类号】：TG178

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