加载与循环干湿条件下MnCu耐候钢的腐蚀行为  

CORROSION BEHAVIOR OF MnCu COST-EFFECTIVE WEATHERING STEEL UNDER CYCLIC LOAD IN A WET/DRY CYCLIC CORROSION ENVIRONMENT

作　　者：王雷[1] 董俊华[1] 柯伟[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《中国腐蚀与防护学报》2010年第4期257-261,268,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点基础研究发展规划项目(2004CB619101);国家自然科学基金重大项目(50499336,50971120)资助

摘　　要：同时采用循环加载及模拟加速腐蚀的方法,研究循环载荷对耐候钢在含氯离子气氛中腐蚀行为的影响。锈层截面形貌以及带锈电极的电化学极化行为和阻抗谱表明,在相同的拉伸时间内,腐蚀周次较低时,耐候钢能较快获得稳定的锈层;腐蚀周次较高时,在长时间的循环载荷影响下,MnCu耐候钢的外锈层会更易产生裂纹甚至脱落,但内锈层结构相对稳定而基本不受一般载荷的影响,因此MnCu耐候钢依然具有良好的耐候性。The resistance to corrosion of a MnCu cost-effective weathering steel under cyclic loading in a simulated chloride ion environment was investigated.The experiments were performed using a new wet/dry cyclic corrosion test（CCT）.In order to simulate wet and dry alternative corrosion,0.3 mass%NaCl solutions was sprayed on the specimens which were tensioned in the range of elastic deformation under cyclic loading （the maximum stress was 208 MPa）.The rusted specimens were examined by SEM and via electrochemical measurements.The results showed that,in the same cyclic tension period,the MnCu cost-effective weathering steel has stable rust layer after low CCT,but there were more cracks appeared in outer rust layer after higher CCT due to the cyclic loading,but MnCu cost-effective weathering steel had still excellent corrosion resistance, because the inner rust played a key role to resist further corrosion.

关 键 词：MnCu耐候钢 干湿交替加速腐蚀 循环加载 电化学测量 锈层 

分 类 号：TG142.71[一般工业技术—材料科学与工程]