冷喷涂Al基复合涂层的制备及耐蚀性能研究  

Preparation and Corrosion Resistance of Cold Sprayed Al-based Composite Coating

作　　者：陈琴 余敏 葛洁洁 陈辉[1] CHEN Qin;YU Min;GE Jie-jie;CHEN Hui(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610036,China;School of Materials,Northwestern Polytechnical University,Xi’an 710000,China)

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610036 [2]西北工业大学材料学院,陕西西安710000

出　　处：《材料保护》2022年第1期44-49,共6页Materials Protection

基　　金：国家自然科学基金项目(51601157)资助。

摘　　要：铝合金以其轻量化特性及优异的耐腐蚀性能得到广泛应用。冷喷涂技术具有低温高速沉积的特点,是制备铝防腐涂层的有效方法。采用机械混合的方式制备了铝基-陶瓷相混合粉末,并通过冷喷涂在Al1060表面制备了Al5056,Al5056-Al_(2)O_(3),Al5056-SiC,Al5056-WC 4种涂层。通过Image-Pro Plus软件分析了涂层气孔率及陶瓷相在涂层中的含量,并采用显微硬度测试了涂层的硬度;研究陶瓷种类对复合涂层电化学性能的影响,并结合腐蚀形貌分析了涂层的耐蚀性。结果表明,陶瓷相都能有效沉积,但喷涂时陶瓷颗粒的破碎团聚会影响涂层的致密性;Al5056和Al5056-Al_(2)O_(3);涂层同时表现出高阻抗模量,而Al5056-Al_(2)O_(3);涂层的自腐蚀电流密度和腐蚀速率相比其他涂层降低了1个数量级,因而Al5056-Al_(2)O_(3);涂层具有更好的耐蚀性能。Aluminum alloy is widely used for its light weight characteristic and excellent corrosion resistance. Cold spraying technology is one effective method to fabricate the Al anti-corrosive coatings owing to its high speed and low temperature deposition characterization. In this work, the aluminum powder was mixed with ceramic phase powder to prepare the composite powder by mechanical mixing, and Al5056/Al5056-Al;O;/Al5056-SiC/Al5056-WC coatings were prepared by cold spraying on the Al1060 substrate. The porosity and content of the ceramic phase in the coating were studied through Image-Pro Plus software, and microhardness testing was carried out on the composite coatings. Meanwhile, the effects of ceramic types on the electrochemical properties of composite coatings were studied, and the corrosion resistance of the coating was analyzed in combination with the corrosion morphology. Results showed that the ceramic phase could be effectively deposited, but the self aggregation of ceramic particles during the spraying process affected the compaction of the coating. Besides, Al5056 and Al5056-Al;O;coatings exhibited high impedance modulus, but the self corrosion current density and corrosion rate of Al5056-Al;O;coatings were reduced by an order of magnitude compared with other coatings. Thus, the Al5056-Al;O;coating showed the best corrosion resistance performance.

关 键 词：冷喷涂 陶瓷相 铝基复合涂层 耐蚀性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]