Effect of α-Al2O3 on the properties of cold sprayed Al/α-Al2O3 composite coatings on AZ91D magnesium alloy

✍ Scribed by Yongshan Tao; Tianying Xiong; Chao Sun; Huazi Jin; Hao Du; Tiefan Li

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 914 KB
• Volume: 256
• Category: Article
• ISSN: 0169-4332
• DOI: 10.1016/j.apsusc.2009.08.012

✦ Synopsis

Al 2 O 3 as feedstock were deposited on AZ91D magnesium alloy substrates by cold spray (CS). The content of a-Al 2 O 3 in the feedstock was 25 wt.% and 50 wt.%, respectively. The effects of a-Al 2 O 3 on the porosity, microhardness, adhesion and tensile strength of the coatings were studied. Electrochemical tests were carried out in neutral 3.5 wt.% NaCl solution to evaluate the effect of a-Al 2 O 3 on the corrosion behavior of the coatings. The results showed that the composite coatings possessed lower porosity, higher adhesion strength and tensile strength than cold sprayed pure Al coating. The corrosion current densities of the composite coatings were similar to that of the pure Al coating and much higher than that of bare AZ91D magnesium alloy.