摘要
为了研究碳钢氟碳聚氨酯-环氧涂层在亚热带季风气候条件下服役的老化特性,在广州地区对该涂层试样进行了户外暴露试验。通过户外暴露不同时间后涂层电化学阻抗谱和微观形貌分析涂层的老化行为,并结合划叉试样微区表面电位分析涂层在破损后的失效行为。结果表明:在亚热带季风气候下,涂层具有较好的抗老化性能,对基体防护效果较好;经12个月的户外暴露试验后,涂层没有失效,但表面出现了微米级孔洞,涂层的抗渗性能下降;随着户外暴露时间的延长,涂层破损部位的金属基体很快腐蚀,在腐蚀产物的作用下,失效行为向涂层覆盖区域逐渐扩展。
Outdoor exposure tests were carried out on fluorocarbon polyurethane and epoxy coating for carbon steel under subtropical monsoon climate in Guangzhou,in order to study the aging characteristics of the coating.The aging behavior of the coating was analyzed by the electrochemical impedance spectrum and micro morphology of the coating after outdoor exposure for different periods of time.The failure behavior of the coating after damage was analyzed with the surface potentials of the micro-area in cross-cutting sample.The results showed that the coating had a good anti-aging property and protective effect on the substrate under subtropical monsoon climate.After 12 months of outdoor exposure test,the coating did not fail,but there were micron-sized pores in its surface,so the impermeability of the coating decreased.With the increase of outdoor exposure time,the metal substrate in the damaged part of the coating quickly corroded,and the failure behavior gradually expanded to the coated area under the action of corrosion products.
作者
宋嘉良
杨臻
刘璇
高瑾
肖葵
莫娟
周正强
SONG Jialiang;YANG Zhen;LIU Xuan;GAO Jin;XIAO Kui;MO Juan;ZHOU Zhengqiang(Beijing University of Science and Technology,Beijing 100083,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Zhejiang Electric Power Corporation Research Institute,Hangzhou 310014,China)
出处
《腐蚀与防护》
CAS
CSCD
北大核心
2023年第8期35-39,116,共6页
Corrosion & Protection
基金
国家电网有限公司总部科技项目(5200-202119092A-0-0-00)。
关键词
碳钢涂层
老化行为
户外暴露
表面电位
carbon steel coating
aging behavior
outdoor exposure
surface potential
作者简介
通信作者:肖葵(1969-),博士,研究员,从事腐蚀与防护研究,010-62333975,xiaokui@ustb.edu.cn。
