氯盐环境下合金元素对钢筋腐蚀行为的影响  

Effect of Alloy Elements on Corrosion Behavior of Rebar under Chloride Salt Environment

作　　者：甘玲 潘红波[2,3] 章静[1] 闫军[2,3] 于同仁[4] 郭湛[4] 刘伟明[2,3] 沈晓辉[1] GAN Ling;PAN Hongbo;ZHANG Jing;YAN Jun;YU Tongren;GUO Zhan;LIU Weiming;SHEN Xiaohui(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243002,China;Key Laboratory of Metallurgical Emission Reduction&Resources Recycling of Ministry of Education,Anhui University of Technology,Ma’anshan 243002,China;Key Laboratory of Metallurgy Engineering&Resources Recycling in Anhui,Anhui University of Technology,Ma’anshan 243002,China;Technology Center,Ma’anshan Iron and Steel Co.Ltd.,Ma’anshan 243000,China)

机构地区：[1]安徽工业大学冶金学院,安徽马鞍山243002 [2]安徽工业大学冶金减排与资源综合利用教育部重点试验室,安徽马鞍山243002 [3]安徽工业大学冶金工程与资源利用安徽省重点试验室,安徽马鞍山243002 [4]马钢股份有限公司技术中心,安徽马鞍山243000

出　　处：《安徽工业大学学报（自然科学版）》2017年第3期215-220,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省高校自然科学研究项目(KJ2016A091);安徽省自然科学基金项目(1708085ME116)

摘　　要：以低合金高强耐蚀钢筋和普通钢筋为试验对象,为模拟海洋飞溅区交替环境,在氯盐环境下进行干、湿周期浸润腐蚀试验。采用扫描电镜(SEM)观察内锈层的表面形貌,采用交流阻抗谱和极化曲线等电化学方法研究合金元素对试验钢筋腐蚀行为的影响机制,采用X射线衍射(XRD)表征锈层结构。结果表明:Cr元素的添加可降低钢筋的自腐蚀电位,促进阳极钝化作用及腐蚀初期内锈层的形成,降低钢筋的平均腐蚀速率,且Cr含量越高,腐蚀初期平均腐蚀速率越低;Mn-Cu协同作用可扩大钢筋钝化范围,使钝化电流密度迅速降低,且使腐蚀中后期的阻抗迅速增大,加快锈层向稳定化锈层α-Fe OOH与Fe3O4发展,缩短稳定性锈层生成时间,降低钢筋腐蚀中后期的腐蚀速率。Taking low alloy high strength corrosion resistant rebars and ordinary rebars as test objects,alternate environments of marine splash zone was simulated,wet and dry cycle immersion corrosion tests were performed in chloride salt environment.The surface morphology of the inner rust layer was observed with scanning electron microscopy(SEM),influence of alloy elements on the mechanism of corrosion behavior of the tested rebar was studied with electrochemical impedance spectroscopy and polarization curves,the structure of rust layer was analyzed with method of AC diffraction(XRD).Results show that the addition of Cr can reduce the self-corrosion potential of tested rebar,promote anode passivation and formation of inner rust layer in the initial corrosion stage,and decrease the average corrosion rate of the tested rebar.With the content of Cr increasing,the average corrosion rate of tested rebar becomes lower at the initial corrosion stage.The synergistic effect of Mn-Cu can enlarge the passivation range of steel bars and decrease average corrosion rate of steel bars,and the impedance of tested rebar increases rapidly in the middle and later corrosion stage,which can accelerate development of rust layer to the stabilization of rust layer ofα-FeOOH and Fe3O4,shorten the formation time of the stability of stable rust layer,and reduce the corrosion rate in the middle and later stage.

关 键 词：低合金耐蚀钢筋 干、湿周期浸润腐蚀 交流阻抗谱 极化曲线 

分 类 号：TG172[金属学及工艺—金属表面处理]