ZM6镁合金的冷喷铝涂层工艺及耐腐蚀性能研究  

Research on Cold Spray Aluminum Coating Process and Corrosion Resistance of ZM6 Magnesium Alloy

作　　者：徐雷 丁宁 李彰 陈立 王长亮 郭孟秋 石仲川 田浩亮 XU Lei;DING Ning;LI Zhang;CHEN Li;WANG Changliang;GUO Mengqiu;SHI Zhongchuan;TIAN Haoliang(Product Development Department,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China;No.6 Military Representative Office in Beijing Region,Beijing 100013,China;Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China;The Sixth Oil Production Plant of China Petroleum Changqing Oilfield Company,Yulin 718600,Shaanxi,China)

机构地区：[1]中国航发北京航空材料研究院产品发展部,北京100095 [2]空装驻北京地区第六军事代表室,北京100013 [3]中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京100095 [4]中国石油长庆油田分公司第六采油厂,陕西榆林718600

出　　处：《热喷涂技术》2024年第1期35-47,共13页Thermal Spray Technology

基　　金：国家重点研发计划项目(2021YFB3702004);国家科技重大专项(2017-VII-0012-0109);国家自然科学基金资助项目(52075508)。

摘　　要：为提高镁合金的耐腐蚀性能,在ZM6镁合金基体上采用冷喷涂工艺制备铝涂层,研究了冷喷涂工艺参数(气体温度和压力、喷枪距离及压力)对铝涂层质量的影响,得出最佳工艺参数并利用该最佳工艺参数制备出铝涂层进行盐雾试验。试验结果表明:冷喷涂铝涂层的最佳工艺参数为:温度310℃、气体压力2.0 MPa、喷涂距离20 mm、基板相对移动速度30~50 mm s。冷喷涂铝的薄涂层盐雾腐蚀的腐蚀产物为Al_(2)O_(3)、Al(OH)3、Mg(OH)_(2)和MgCl_(2)。随着时间的增长,薄铝涂层被击穿并与镁合金发生电偶腐蚀,加速了基体的腐蚀。冷喷涂铝的厚涂层由于表面形成致密而连续的氧化膜,阻碍了腐蚀介质的侵入,对镁合金基体产生了较好的防护作用。利用最佳工艺参数制备的冷喷涂铝的厚涂层耐盐雾时间超过1200 h。In order to improve the corrosion resistance of magnesium alloy,aluminium coating was prepared by cold spraying process on ZM6 magnesium alloy matrix.The effects of cold spraying process parameters(gas temperature and pressure,spraying distance and pressure)on the quality of aluminium coatings were investigated,and the optimum process parameters were obtained and used to prepare aluminium coatings for salt spray test.The test results show that the optimum process parameters for cold spraying aluminium coating include temperature of 310℃,gas pressure of 2.0 MPa,optimum distance of spraying of 20 mm,and relative movement speed of the substrate of 30-50 mm s.The corrosion products of salt spray corrosion of cold sprayed aluminium thin coatings are Al_(2)O_(3),Al(OH)3,Mg(OH)_(2),and MgCl_(2).With the growth of time,the thin aluminium coatings are punctured and galvanic coupling corrosion with magnesium alloy occurred,which accelerates the corrosion of the substrate.The thick coating of cold sprayed aluminium produces a better protective effect on the magnesium alloy substrate due to the formation of a dense and continuous oxide film on the surface,which hinders the intrusion of corrosive media.The salt spray resistance time of the thick coating of cold sprayed aluminum prepared using the optimal process parameters exceeds 1200 hours.

关 键 词：镁合金 冷喷涂 盐雾试验 工艺参数 

分 类 号：TG174.4[金属学及工艺—金属表面处理]