摘要
目的研究2种防护涂层体系在湿热海洋环境下自然暴露3 a的防护性能劣化规律。方法确定试验件为钢-铝(钢)螺接连接件,试验地点为海南万宁,并按周期测得不同暴露时间下涂层A和涂层B的外观形貌、色差、光泽度、表面傅里叶红外光谱、电化学阻抗的相关数据。通过对比分析测试结果,判断2种涂层在不同暴露时间下的劣化程度,并最终得到其劣化规律。结果涂层A自然暴露1 a老化严重,紧固件区域涂层剥落,平板区域失光率约为75%,阻抗模量降低5个数量级,色差ΔE*为5(轻微变色),涂层有机基团老化降解严重。涂层B自然暴露2 a,老化较严重,紧固件区域涂层剥落、生锈,平板失光率约为20%,阻抗模量降低2个数量级,色差ΔE^(*)为11(严重变色),涂层有机基团轻微老化降解。结论对于螺钉连接结构,连接区域不仅更容易被腐蚀,而且增加了附近平板区域的不一致性。涂层体系B的保护能力优于涂层体系A,涂层体系B的有效保护时间约为2 a,而涂层体系A则不到1 a。
The work aims to study the degradation law of two kinds of protective coatings after 3 years of natural exposure in hot and humid marine atmospheric environment.Steel and aluminum(steel)connection fittings were selected as test samples and Wanning of Hainan was determined as the test site.The appearance,color difference,luster,surface Fourier transform infrared spectrum and electrochemical impedance of coatings A and B for different exposure time were measured periodically.Through comparison and analysis of the test results,the degradation degree of the two coatings for different exposure time was judged,and the degradation law was finally obtained.The coating A was severely aged after one year of natural exposure:the coating in fastener area was peeled off,the optical loss rate in plate area was about 75%,the impedance modulus was reduced by five orders of magnitude,the color difference ΔE^(*)was 5(slight discoloration),and the organic groups in the coating were seriously aged and degraded.After two years of natural exposure,the coating B was seriously aged:the coating in the fastener area was spalling and rusting,the plate optical loss rate was about 20%,the impedance modulus was reduced by two orders of magnitude,the color difference ΔE^(*)was 11(severe discoloration),and the organic groups of the coating were slightly aged and degraded.For screw connection structure,the connection area is not only easier to be corroded,but also increases the inconsistency of the adjacent plate area.The protection ability of coating system B is better than that of coating system A.The effective protection time of coating system B is about two years,while that of coating system A is less than one year.
作者
冯亚菲
朱玉琴
苏艳
代璐
李佳蒙
龙仕腾
FENG Ya-fei;ZHU Yu-qin;SU Yan;DAI Lu;LI Jia-meng;LONG Shi-teng(No.92228 PLA,Beijing 100072,China;Southwest Institute of Technology and Engineering,Chongqing 401329,China;Chongqing Key Laboratory of Environmental Effects and Protection,Chongqing 401329,China)
出处
《装备环境工程》
CAS
2022年第12期73-81,共9页
Equipment Environmental Engineering
关键词
自然暴露试验
涂层劣化分析
防护能力
natural exposure test
coating degradation analysis
protection ability
