摘要
为了提高无铬达克罗涂层的硬度和耐蚀性,分别制备了无铬达克罗涂料、Y_(2)O_(3)改性涂料、氧化石墨烯(GO)改性涂料和Y_(2)O_(3)+GO改性涂料,研究了4种处理工艺下涂层的形貌、硬度和耐腐蚀性。结果表明,Y_(2)O_(3)+GO改性涂层表面光滑、均匀、致密、无缺陷,比无铬达克罗涂层的显微硬度提高了46.17%,达到188.92 HV。经过480 h中性盐雾试验,Y_(2)O_(3)+GO改性涂层表面几乎没有出现红锈,而无铬达克罗涂层、Y_(2)O_(3)改性涂层和GO改性涂层表面出现了不同程度的红锈。电化学试验结果表明,Y_(2)O_(3)+GO改性涂层具有最大的腐蚀电位、最小的腐蚀电流密度和最大的极化电阻,与无铬达克罗涂层相比,自腐蚀电流密度降低了近一个数量级,极化电阻提高了5倍以上。盐水浸泡720 h后,Y_(2)O_(3)+GO掺杂改性具有协同作用,可同时起到封堵作用,能填补缝隙、孔洞等缺陷,有效防止了腐蚀性介质的侵入和腐蚀的发生。
In order to improve the hardness and corrosion resistance of chromium-free dacromet coatings,chromium-free dacromet coatings,Y_(2)O_(3) modified coatings,graphene oxide(GO)modified coatings,and Y_(2)O_(3)+GO modified coatings were prepared.The morphology,hardness and corrosion resistance of the coatings under four treatment processes were studied.The results show that the Y_(2)O_(3)+GO modified coating surface is smooth,uniform,dense and defect free.Compared to the chromium free dacromet coating,the microhardness of the Y_(2)O_(3)+GO modified coating increased by 46.17%,reaching 188.92 HV.After 480 h neutral salt spray test,there is almost no red rust on the surface of Y_(2)O_(3)+GO composite coating.However,the surfaces of chromium free dacromet coating,Y_(2)O_(3) modified coating and GO modified coating show varying degrees of red rust.The electrochemical test results show that the Y_(2)O_(3)+GO modified coating has the highest corrosion potential,the lowest current density,and the highest polarization resistance.Compared with the chromium free dacromet coating,the Y_(2)O_(3)+GO modified coating reduces the self corrosion current density by nearly an order of magnitude and increases the polarization resistance by more than 5 times.After soaking in salt water for 720 h,Y_(2)O_(3)+GO doping modification has a synergistic effect and can simultaneously act as a sealing agent,filling gaps,holes and other defects,effectively preventing the invasion of corrosive media and the occurrence of corrosion.
作者
章艳玲
李红玲
姚玮玮
祁圳
董壮曼
Zhang Yanling;Li Hongling;Yao Weiwei;Qi Chen;Dong Zhuangman(School of Chemistry and Materials Engineering College of Pharmacy,Xinxiang University,Xinxiang 453003,China)
出处
《电镀与精饰》
北大核心
2025年第12期27-35,共9页
Plating & Finishing
基金
国家自然科学基金资助项目(51902278)。
关键词
无铬达克罗涂层
氧化钇纳米颗粒
氧化石墨烯
耐蚀性
chromate-free dacromet coating
Y_(2)O_(3)nanoparticles
graphene oxide
corrosion resistance
