The work aims to select the best injected elements by analyzing the effect of different ion implantation on the corrosion resistance and mechanical properties of the structural steel to improve the surface composition and corrosion resis-tance of 45CrMoVE structural steel.Based on the previous research process,the study of Mo,Co,Ta and Ti ion implantation technology was carried out.The structural steel samples with ion implantation were put into NaCl solution to analyze the effect of ion implantation of different elements on the corrosion potential of structural steel.Combined with the salt spray corrosion test,the effect of different ion implantation on the corrosion resistance of structural steel was studied.The phase of the surface layer of structural steel samples was analyzed by X-ray diffraction technique as well.Mechanical properties of structural steel after ion implantation were investigated by mechanical properties test.After Mo ions were injected into NaCl solution,the natu-ral corrosion potential and pitting potential were the highest and most positive.When the structural steel was injected with Mo ions for 3×1017 atoms/cm2,the corrosion potential was close to 0.5 V and the corrosion current was the minimum.After implan-tation of Mo ions,the test piece had the best salt spray corrosion resistance.Mo ion combined with C atom in structural steel to form more carbides such as MoC and Mo2C on the surface layer of structural steel,which improved the corrosion resistance of structural steel.Due to the small thickness of the ion implantation layer,the surface morphology and macroscopic mechanical properties of the structural steel were basically unchanged after ion implantation.Ion implantation can effectively improve the corrosion resistance of 45CrMoVE structural steel.While Mo ions are injected with 3×1017 atoms/cm2 and the implantation en-ergy is 130 keV,the corrosion resistance of 45CrMoVE structural steel is the best.
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