Effect of Er(NO3)3 addition on wear resistance of pure magnesium micro-arc oxide film layer
In view of the poor wear resistance of pure magnesium,the surface modification of pure magnesium in Na2SiO3-C10H14N2Na2O8 electrolyte by micro-arc oxidation(MAO)technology is carried out to improve the wear resistance of pure magnesium.Different amounts of rare earth salt Er(NO3)3 were added to the electrolyte to study the effects of Er(NO3)3 addition on the phase composition,micro-structure,microhardness,critical load and friction coefficient of pure magnesium microarc oxide layer.The results showed that when Er(NO3)3 was not added to the electrolyte,there were mainly Mg,MgO,Mg2SiO3 and MgF2 phases in the film layer,and Er2O3 phases were detected in the film layer after Er(NO3)3 was added to the electrolyte.After the addition of rare earth salt Er(NO3)3 to the electrolyte,the diameter of the pores on the surface of the film layer decreased,and when the amount of rare earth salt Er(NO3)3 added exceeded 2.85 g/L,obvious cracks appeared on the surface of the film layer.After adding rare earth salt Er(NO3)3 to the electrolyte,the microhardness of the film layer obtained by MAO treatment was higher than that of the rare earth salt Er(NO3)3,and when the amount of rare earth salt Er(NO3)3 was 2.85 g/L,the microhardness value of the film layer was the largest,about 185.8±7.1 HV.The critical load and friction coefficient of the film layer increased first and then decreased with the increase of rare earth salt Er(NO3)3,and when the addition of rare earth salt Er(NO3)3 was 2.85 g/L,the critical load and friction coefficient of the film layer were about 12.2±0.5 N and 0.15.
pure magnesiummicro-arc oxidationrare earth saltabrasion resistance
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