Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam
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The high-current pulsed electron beam (HCPEB) treatment with current density 6 J/cm2 was applied on AZ91 Mg alloy to improve its corrosion resistance. Results showed that the net-like Mg17Al12 disappeared on the surface of AZ91 Mg alloy after irradiation by HCPEB, which was instead of supersaturated Al element on the surface. Nevertheless, the application of HCPEB also led to the formation of crater-like and groove-like structures as well as micro-cracks on the surface of AZ91 Mg alloy. After HCPEB treatment by 3, 5 and 10 pulses, the AZ91 Mg alloy exhibited better corrosion resistance. However, the increasing amount of micro-cracks reduced the anti-corrosive properties of AZ91 Mg alloy as the pulse increased to 20 and 30.
KeywordsHigh-current pulsed electron beam (HCPEB) Corrosion resistance Electrochemical impedance spectroscopy (EIS) AZ91 Mg alloy Microstructure
The authors gratefully acknowledge the finacial support from the National Natural Science Foundation of China (Nos. 51771128 and 51771129), the Projects of International Cooperation in Shanxi (No. 201703D421039) and the Natural Science Foundation of Shanxi (No. 201601D011034). The authors thank Dr. F.J. Xu and Dr. G.Z. Tang for experimental assistance and useful discussions.