Corrosion Resistance Andmechanical Property Of Az31 Magnesium Alloy By Ion Implantation

N,Ti,Cr,Al ion and N+Ti,N+Cr,N+Al duplex ion implantation was conducted on AZ31 magnesium alloy surface by metal vapor vacuum arc (MEVVA) ion implanter. Auger electron spectroscopy (AES), scanning electronic microscope (SEM), X-ray diffraction (XRD), electrochemical system, microhardness tester and friction-abrasion testing machine are used to analysis the variation laws of the phase structure, corrosion resistance and mechanical properties with different ion species, energy and substrate conditions.The results of XRD, EDAXP and AES revealed that, the phase structure of the ion implantation sample different with different injected ions and energy and substrate conditions. The sample by ion implantation will form a certain thickness modified layer and the surface grain size increases, the maximum diffraction peak positions and half-peak width of same phase changes, same type ion implantated into difference conditions substrate, the type of phase in modified layer are same. N+Ti duplex ion implantated into alloy, the surface layer is about 180nm and the modification-layer formed by Mg,MgO,Mg3N2,Ti,TiO,TiO2,TiN phases.The results of electrochemical system revealed that, the corrosion resistance of modification-layer increased afer different type's ion implantation. The levels of corrosion resistance increase different with different injected ions and energy and substrate conditions. Compared with the unannealing sample and AZ31 magnesium alloy of 4 hours annealing, the corrosion resistance of the sample surface is small increase. Compared with the unannealing sample by same ion implantated and annealing AZ31 magnesium alloy by same ion implantated, the corrosion resistance of the entire sample surface is increase, but Increase the annealing time on the sample surface has little effect to further improve the corrosion resistance.Compare with matrix and all the experiment samples, sample with those processing parameters: inject ion N+Ti, inject energy 45kV, N and Ti ion beam streng respectively for 2.5 mA·cm-2, implantation time 2h and matrix without annealing have the best corrosion resistance. Its corrosion potential of treated coupon increases by 577mV, the corrosion current density decreases by over 110μA·cm-2 and the polarization resistance increases by 69.27 times as the best performance in 3.5% saturated Nacl solution.The micro hardness of treated sample significantly increases. The levels of micro hardness increase different with different injected ions and energy and substrate conditions. Compared with the unannealing sample and AZ31 magnesium alloy of 4 hours annealing, the micro hardness of the sample surface is small decrease. Compared with the matrix, the surface microhardness of samples by annealing+ion implantation significantly increases, but the sample after the annealing by same ion implantated, with the annealing time increase, them microhardness decrease. The same time annealing by different ion implantated, them microhardness have similar trend.In all test samples, the micro hardness of sample with Ti ion implantated unannealing matrix increase largest by 64%.The wear resistance of modification-layer increased afer different types ion implantation. The levels of wear resistance increase different with different injected ions. The wear resistance of 4 hours annealing sample better than unannealing sample.The wear resistance of annealing sample by the same ion implantated better than unannealing sample by the same ion implantated.