汽车冷轧钢DC06和DP600在NaHSO_3溶液中的腐蚀行为  

Corrosion Behavior of Automotive Cold Rolled Steels DC06 and DP600 in NaHSO_3 Solution

作　　者：徐致孝 周和荣[2] 姚望[2] 

机构地区：[1]航宇救生装备有限公司工艺技术部,襄阳441003 [2]武汉科技大学材料与冶金学院,武汉430081

出　　处：《中国腐蚀与防护学报》2017年第2期155-161,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(50971048);科技部科技基础条件平台建设专项~~

摘　　要：采用全浸实验、失重法和电化学阻抗谱研究了汽车冷轧低碳钢DC06和双相钢DP600在0.02 mol/L Na HSO3溶液中的腐蚀行为与规律,用SEM观察腐蚀产物形貌,用EDS分析腐蚀产物组成。结果表明,随腐蚀时间的延长,DC06和DP600钢表面腐蚀产物不断增多,失重增大;腐蚀产物形貌以团状为主,呈现不均匀的凹凸形貌;腐蚀产物主要是Fe的氧化物和硫酸盐。电化学阻抗谱拟合结果显示,DC06和DP600钢的腐蚀速率都是先升高后降低,并逐渐趋于稳定。The corrosion behavior of automotive cold rolled steels DC06 and DP600 in 0.02 mol/L NaHSO3 solution was studied by full immersion test, mass loss method and electrochemical impedance spectroscopy, as well as SEM and EDS. The results showed that the corrosion product continuously grew, while the mass loss value increased with the extending test time. The corrosion product presents agglomerate- and uneven fluctuant-morphology, which was composed of iron oxides and sulfate. The electrochemical impedance spectroscopy results revealed that the corrosion rate of low carbon steel DC06 and dual phase steel DP600 increased first and then decreased, and then gradually stabilized.

关 键 词：冷轧钢 全浸实验 失重法 极化曲线 电化学阻抗谱 

分 类 号：TG172.3[金属学及工艺—金属表面处理]