摘要
在Sa2等级的钢材表面制备出一种低表面处理环氧防腐底漆,其固含高达80%,实干速度只需4 h,平均附着力可达10 MPa,室外暴晒5 a涂层无任何开裂、脱落,且耐酸、碱、盐溶液腐蚀性能优异。利用Fourier红外光谱(FTIR)、电化学阻抗谱技术(EIS)和三维视频显微镜对涂层的电化学性能和耐蚀机理进行了研究,结果表明,经过2400 h海水浸泡,涂层阻抗可达1010Ω·cm^(2),耐海水腐蚀性能优异,阻抗值随浸泡时间的延长先减小后增大。环氧树脂和聚酰胺固化交联形成的致密涂层对腐蚀介质起到了很好的屏蔽作用,中后期磷酸锌颜料与钢材表面铁锈反应生成的稳定络合物阻止了腐蚀介质的渗入,是其耐腐蚀和实现低表面处理的关键。
A surface-tolerant epoxy anticorrosive primer was prepared on the surface of Sa2 grade steel.Its solid content was up to 80%,the drying speed was only 4 h,and the average adhesion was up to 10 MPa.The coating keeps intact with no cracking and no spallation after outdoor exposure for 5 a,and has excellent corrosion resistance to acid,alkali and salt solution.The electrochemical performance and corrosion mechanism of the coating were studied by means of FTIR,EIS and three-dimensional video microscope.The results showed that the impedance of the coating reached 1010Ω·cm^(2) after 2400 h seawater immersion,which showed excellent corrosion resistance.The impedance of the coating decreased first and then increased with the extension of immersion time.The densification of the coating is due to the cross-linking of epoxy resin and polyamide curing,so that can act as a good barrier to the corrosive medium.During the middle and late stage of the corrosion process,the stable complex formed by the reaction of zinc phosphate pigment with the rust on steel surface,can prevent the infiltration of corrosive medium,which may be the reason why the coating has excellent corrosion resistance and high tolerance to the substrate surface.
作者
陈肖寒
白杨
王志超
陈从棕
张勇
崔显林
左娟娟
王同良
CHEN Xiaohan;BAI Yang;WANG Zhichao;CHEN Congzong;ZHANG Yong;CUI Xianlin;ZUO Juanjuan;WANG Tongliang(Marine Chemical Research Institute Co.,Ltd.,State Key Laboratory of Marine Coatings,Qingdao 266071,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2023年第5期1126-1132,共7页
Journal of Chinese Society For Corrosion and Protection
基金
山东省博士后创新项目和青岛市博士后应用研究项目。
关键词
环氧防腐底漆
低表面处理
电化学阻抗
耐蚀性
epoxy anticorrosive primer
low surface treatment
electrochemical impedance
corrosion resistance
