拉应力对X80钢原始及水淬组织在酸性土壤中腐蚀电化学行为的影响  

Influence of Tensile Stress on Electrochemical Behavior of As-Received and Water-Quenched X80 Steel in Acidic Simulated Soil Solution

作　　者：张杰[1] 刘静[1] 胡骞[1] 黄蜂[1] 

机构地区：[1]武汉科技大学材料与冶金学院

出　　处：《材料保护》2014年第9期18-21,7,共4页Materials Protection

基　　金：国家自然科学基金(51301124)资助

摘　　要：目前,对拉应力作用下X80管线钢原始及水淬组织在酸性土壤模拟溶液中的电化学行为研究较少。采用电化学阻抗谱、动电位极化曲线和扫描电镜等方法对此进行了研究。结果表明:在拉应力作用下,2种组织X80钢的自腐蚀电位下降,反应活性增大,水淬组织表面有更多的位错线,对力学因素更加敏感;随拉应力增大,2种组织在酸性土壤模拟溶液中的反应电阻减小,反应活性增大,水淬组织的更加显著,原始组织腐蚀产物膜电阻先增大后减小,水淬组织的不断减小;2种组织X80钢的极化电阻、腐蚀速率随拉应力的变化规律与腐蚀产物膜电阻的相对应。The corrosion behavior of as-received and water-quenched X80 steel in acidic simulated soil solution was investigated based on measurements of electrochemical impedance spectra and polarization curves in association with scanning electron microscopic observation.It was found that the open circuit corrosion potential of the two types of X80 steel decreased and their reaction activity increased in the presence of tensile stress.Particularly,the water-quenched X80 steel was more sensitive to tensile stress and contained more displacement lines on the surface.As the tensile stress increased,the reaction resistance of the two types of X80 steel declined,and their reaction activity rose;and in particular,the reaction resistance and reaction activity of the water-quenched steel varied more obviously therewith.Moreover,the resistance of the corrosion product film on as-received steel increased initially and decreased later with increasing tensile stress,while that of the water-quenched counterpart continuously decreased therewith.In general,the variations in the polarization resistance and corrosion rate of the two types of X80 steel well corresponded to the variation in the resistance of the corrosion product film.

关 键 词：X80管线钢 拉应力 酸性土壤腐蚀 电化学行为 

分 类 号：TG172.4[金属学及工艺—金属表面处理]