Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

Abstract

The high-current pulsed electron beam (HCPEB) treatment with current density 6 J/cm 2 was applied on AZ91 Mg alloy to improve its corrosion resistance. Results showed that the net-like Mg 17 Al 12 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. Keywords High-current pulsed electron beam (HCPEB) Á Corrosion resistance Á Electrochemical impedance spectroscopy (EIS) Á AZ91 Mg alloy Á Microstructure

Surface modifications of a cold rolled 2024 Al alloy by high current pulsed electron beams

“…While it is well established from the analysis of several Mg alloys containing Al that a selective evaporation of Mg takes place over Al [38,64,77], our results can be explained by the condensation (i.e. redeposition) of some of the evaporated Mg and Al oxidation in the HCPEB chamber.…”

Surface Alloying and Improved Property of Nb on TC4 Induced by High Current Pulsed Electron Beam

“…The polarization curve, corrosion potential and current density statistics of initial and Nb-alloyed samples in 3.5 wt% NaCl solution are shown in Figure 9. From the electrochemical corrosion polarization curve in Figure 9a, the initial passivation area of the Nb-alloyed samples is significantly large, indicating that the corrosion resistance has been improved after irradiation [43,44]. The current peak appeared in the second passivation area of the irradiated samples because of the continuous self-repair of the oxide film, which contributed to the improved corrosion properties [45].…”

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

“…As structural and functional material, Mg and its alloy present many properties owing to its high specific strength, rigidity and good electromagnetic shielding properties. These performances make Mg alloy very attractive for applications in aerospace, automotive and electronic industries [1][2][3][4]. Moreover, due to the good biocompatibility and suitable degradation speed, Mg alloy also has a trend to replace traditional stainless steel as biomaterials [5,6].…”