摘要
通过盐雾实验、电化学阻抗谱和极化曲线研究了耐蚀钢筋20MnSiCrV和普通钢筋20MnSiV在氯盐环境下的耐蚀性能和腐蚀敏感性,利用SEM,EMPA线扫描和XRD分析锈层形貌、组成及合金元素的分布。结果表明,耐蚀钢筋的耐Cl-腐蚀承受能力较高,为普通钢筋的1.5倍;腐蚀速率和腐蚀坑深度分别为普通钢筋的58%和74%;两种钢表面锈层主要成分均为Fe3O4,α-FeOOH和γ-FeOOH,其中耐蚀钢筋的锈层为双层结构,Cr和Si明显富集在内层,有利于形成致密内锈层,提高钢筋的耐腐蚀性能。
Corrosion resistance and corrosion sensitivity to chloride containing environment of 20MnSiCrV steel and 20MnSiV steel was comparatively investigated by salt- spray corrosion test with 3.5%NaCl solution, as well as electrochemical impedance spectroscopy and polarization curve measurements in chloride containing alkaline solutions. The formed corrrosion product scales were characterized by SEM, EPMA and XRD. The results show that the corrosion resistance to Cl-of 20MnSiCrV steel was 1.5 times over that of 20MnSiV steel. The average corrosion rate and depth of corrosion pits of 20MnSiCrV steel were 58% and 74% of those of 20MnSiV steel, respectively.The major components of corrosion products of the two steels were Fe3O4, α-Fe OOH and γ-Fe OOH.Corrosion scale of 20MnSiCrV steel can be differentiated into an inner layer and an outer layer.The inner layer is enriched in Cr and Si, thereby beneficial to the corrosion resistance of the steel.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2015年第5期461-466,共6页
Journal of Chinese Society For Corrosion and Protection
基金
江苏省产学研联合创新资金―前瞻性联合研究项目(BY2013091)资助
关键词
耐蚀钢筋
电化学阻抗谱
腐蚀敏感性
内锈层
corrosion resistant rebar
electrochemical impedance spectroscopy
corrosion sensitivity
inner rust layer
