冷喷涂Al基复合涂层的制备及耐蚀性能研究

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-Al2O3,Al5056-SiC,Al5056-WC 4种涂层.通过 Image-Pro Plu...

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

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.