摘要
采用自制大气腐蚀模拟试验装置模拟输电杆塔用镀锌钢的服役环境,采用动电位极化测试技术研究沉积不同浓度NaCl和NaHSO3的镀锌钢在干湿交替作用下的腐蚀行为,利用扫描电镜、X射线衍射仪研究干湿交替作用下镀锌钢的表面形貌以及腐蚀产物的特征.结果表明,NaCl及NaCl和NaHSO3共存均会对镀锌钢造成腐蚀.随着镀锌钢样品表面沉积腐蚀介质浓度的增大,腐蚀电流密度逐渐增大.随着暴露时间的增加,镀锌钢的腐蚀速率先升高后降低,同时NaCl和NaHSO3混合介质对镀锌钢的腐蚀要比单独NaCl存在时严重.
The corrosion process of galvanized steel for power transmission tower in media with different concentration of C1- and HSOf was investigated by using potentiodynamic polarization test and cyclic wet-dry accelerated laboratory test. Then, the surface morphology and characteristics of the corrosion products were examined by X-ray diffractometer and scanning electron microscopy. The results showed that the galvanized steel was corroded in the presence of NaC1 and mixed NaCI and NaHSO3, and the corrosion current density increased with the increasing concentration of CI and HSO3. The corrosion rate of galvanized steel was greater at the early stage of test and then decreased with the extension of test time. In addition, the effect of the combination of CI and HSO3 on the corrosion of galvanized steel was more serious than that of C1.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2013年第1期13-18,共6页
Corrosion Science and Protection Technology
基金
国家电网-华东电力试验研究院项目(20103304012C072-03)资助
