酸性土壤环境中的剥离体系滞留液及其对X80钢的腐蚀影响.docVIP

酸性土壤中的模拟滞留液溶液对X80钢的腐蚀行为 赵博 杜翠薇 刘智勇 李晓刚 李月强 （北京科技大学腐蚀与防护中心 北京 100083； 腐蚀与防护教育部重点实验室 北京 100083 ）本文采用矩形剥离缝隙模型，原位测量了酸性鹰潭土壤模拟溶液中的剥离区滞留液成分变化，选配了剥离体系腐蚀前期和后期的模拟滞留液溶液，并通过动电位极化曲线、电化学阻抗和微观形貌分析对腐蚀性进行评价。实验结果表明，剥离体系腐蚀后期滞留液的Cl-、Na+、K+含量升高，氧量减少、pH值降低，其腐蚀电流密度升高，Rct减小 关键词：X80钢, 剥离涂层, 滞留液, 腐蚀, 电化学 中图分类号： TG172 文献标识码：A 文章编号： Effect on Trapped Simulated Solution Corrosion of X80 Steel in Acidic Soil Environment ZHAO Bo DU Cui-wei LIU Zhi-yong LI Xiao-gang LI Yue-qiang (Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083; Key Laboratory of Corrosion and protection of Ministry of Education, University of Science and Technology Beijing, Beijing 100083) Abstract The changes in the nature of trapped solution in Yingtan acid soil simulation solution was in-situ measured with rectangular disbonded model, and the trapped simulated solution of early and late corrosion was matched. Their property was analyzed by potentiodynamic polarization curve electrochemical impedance, and the micro morphology. The experimental results showed that the content of Cl-, Na+, K+ contents increased, the dissolved oxygen content and pH reduced at the late of disboned corrosion. At the same time, the corrosion current density increased, the charge transfer resistance (Rct) decreased, the protective corrosion product films is destroyed serious, and pitting extent increased significantly. With Compare of bulk solution and early corrosion solution, the trapped solution was more destructive. Key Words: X80 Steel, Disbanded area, Trapped solution, Corrosion, Electrochemistry 基金项目：国家自然科学基金重点项目，国家高技术发展计划863计划（2012AA040105）资助 作 者：赵博（1984—），男，汉族，博士研究生，从事金属腐蚀与防护研究。 通信作者：杜翠薇（1972—），女，汉族，博士，教授，博士生导师，从事金属腐蚀与防护研究，电话E-mail： ducuiwei@??? 0引言 近几十年，管线钢石油天然气等材料腐蚀领域[17]。 本文拟结合我国典型的东南酸性土壤（鹰潭）体系，重点解决以下两个问题：（一）采用模拟剥离体系的原位实验，探究剥离区滞留液中的成分，包括各种离子含量和pH值和溶解氧含量的变化，进一步深入认知剥离体系腐蚀的变化规律；（二）根据滞留液成分变化，建立该土壤体系下适当的滞留液的模拟溶液体系，并通过电化学手段其对其腐蚀影响进行