Effect of α-Al2O3 on the properties of cold sprayed Al/α-Al2O3 composite coatings on AZ91D magnesium alloy |
| |
Authors: | Yongshan Tao Tianying Xiong Chao Sun Huazi Jin Hao Du Tiefan Li |
| |
Institution: | aState Key Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences 110016, PR China |
| |
Abstract: | Composite coatings using pure Al powder blended with α-Al2O3 as feedstock were deposited on AZ91D magnesium alloy substrates by cold spray (CS). The content of α-Al2O3 in the feedstock was 25 wt.% and 50 wt.%, respectively. The effects of α-Al2O3 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 α-Al2O3 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. |
| |
Keywords: | Cold spray Porosity Corrosion AZ91D Composite coatings |
本文献已被 ScienceDirect 等数据库收录! |