摘要
通过Tafel直线外推法研究不同应力作用下斜拉桥拉索镀锌钢绞线在模拟酸雨溶液中的腐蚀行为,采用SEM、XRD、DTA-TG表征钢绞线镀锌层腐蚀后表面形貌、腐蚀产物理化性质.结果表明,随着应力增加,镀锌钢绞线极化电阻变小,腐蚀电流密度增大,且在1120MPa应力作用下镀锌钢绞线腐蚀电流密度达最大值,为无应力作用下腐蚀电流密度的7倍;镀锌层发生局部电化学腐蚀,腐蚀后表面出现少量蚀坑,腐蚀产物填满这些蚀坑,覆盖于镀锌层表面,生成的白色腐蚀产物主要是ZnSO4.H2O.
Corrosion of steel wire in cables is a major cause of cable-stayed bridge deterioration. In this paper, the corrosion behavior of galvanized steel wire under different stress was investigated by polarization measurement in a simulated acid rain solution. By XRD, TG-DTA and SEM, the physical and chemical properties of corrosion products and galvanized coating surface morphology are characterized. The results show that corrosion current density of galvanized steel wire become larger with increasing the stress, corrosion current density of galvanized steel wire under 1120MPa stress is seven times of that without stress ,the corrosion type of galvanized steel wire is localized corrosion, the white corrosion products, covered on the surface of galvanized coating,are mainly consisted of ZnSO4 · H2O.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2008年第1期44-46,共3页
Corrosion Science and Protection Technology
基金
重庆市交通委员会科技计划项目
重庆市自然科学基金(2004BB6056)
关键词
腐蚀
应力
模拟酸雨
镀锌钢绞线
corrosion
stress
simulated acid rain
galvanized steel wire
