外场快速修复用六价铬转化膜的性能  

Property Study of Chromate Conversion Coatings Formed by Fast-Repair in Out Field

作　　者：齐建涛[1] 赵亓新 冯孟 安洋 杨玉龙 卞贵学 付明[3] 解二伟 韩力 QI Jiantao;ZHAO Qixin;FENG Meng;AN Yang;YANG Yulong;BIAN Guixue;FU Ming;XIE Erwei;HAN Li(College of new energy,China University of Petroleum(East China),Qingdao Shandong 266580,China;Naval Aviation University,Qingdao Shandong 266041,China;China Air-borne Missile Academy,Luoyang Henan 471003,China;Shenyang Aircraft Corporation,Shenyang Liaoning 110027,China;Northeast Electric Group High-voltage Switch Co.,Ltd.Shenyang Liaoning 110023,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]海军航空大学,山东青岛266041 [3]中国空空导弹研究院,河南洛阳471003 [4]中航工业沈阳飞机工业(集团)有限公司,辽宁沈阳110027 [5]新东北电气集团高压开关有限公司,辽宁沈阳110023

出　　处：《海军航空大学学报》2024年第3期357-364,388,共9页Journal of Naval Aviation University

基　　金：国家自然科学基金(51701239);山东省大学生科研项目(22SSR052,22SSR048);山东魏桥创业集团有限公司教育部产学合作协同育人项目(BINTECH-KJZX-20220831-35)。

摘　　要：外场装备损伤部位快速修复可维持装备服役期间的功能性及寿命。文章对比分析了AA7B04铝合金表面损伤部位及六价铬转化膜再修复样品的表面微观组织、化学成分、电化学性能、酸性盐雾性能。研究结果表明,自主研发六价铬溶液可有效修复划痕样品。划痕修复部位形成一层致密薄膜,且主要成分包括Cr、F、O、K等元素;对比分析拉曼光谱结果,划痕修复部位存在显著的六价铬CrO_(4)^(2-)(847 cm^(-1));电化学阻抗谱结果证明再修复样品在10-2Hz处阻抗膜值为5.09×10^(5)Ω⋅cm^(-2),比划痕样品提高了5倍;电动位极化曲线显示再修复样品自腐蚀电流密度为10^(-5.5)A·cm^(-2),与划痕样品相比下降了1个数量级;此外,再修复样品耐酸性盐雾周期超过336 h,样品表面无腐蚀点,表面盐雾评级达到10级,失重法表征的腐蚀速度比划痕样品下降1个数量级。Fast repair of damaged parts of outfield equipment can maintain the functionality and lifespan of equipment in service.The damage and repair sites with the chromate conversion coating on the surface of AA 7B04 aluminum alloy,including the surface microstructure,chemical composition,electrochemical performance,and acidic salt spray performance,are compared and analyzed.Results indicate that the in-house chromate solution can effectively repair scratched samples.A dense film is formed at the scratched site after repair,and the main components include elements such as Cr,F,O,K,et.al;comparative analyses of Raman spectroscopy results showed that there is a significant chromate,CrO_(4)^(2-)(855 cm^(-1)),at the same site;electrochemical impedance spectroscopy at 10-2 Hz proves that the impedance film value of the repaired sample is 5.09×10^(5)Ω·cm^(-2),which is 5 times higher than the scratch sample;polarization curve shows that corrosion current density of the repaired sample is 10^(-5.5) A·cm^(-2),which is an order of magnitude lower than that of the scratch sample;in addition,the acidic salt spray period of the repaired sample exceeded 336 hours without any corrosion points on the surface of the sample.The surface salt spray rating reached level 10,and the corrosion rate characterized by the weight loss method is one order of magnitude lower than that of the scratch sample.

关 键 词：六价铬 转化膜 再修复 铬酸盐 腐蚀 

分 类 号：TB304[一般工业技术—材料科学与工程]