The poor wear and corrosion resistance of aluminum alloys has led to the easy failure of surface perfor-mance.In this work,composite coatings of TiC/martensitic stainless steel(TiC/MSS)on aluminum alloy are fabricated...The poor wear and corrosion resistance of aluminum alloys has led to the easy failure of surface perfor-mance.In this work,composite coatings of TiC/martensitic stainless steel(TiC/MSS)on aluminum alloy are fabricated by a novel approach of circular oscillating laser for enhanced surface performance of alu-minum alloys.The oscillation of laser leads to dense microstructure,and nano/micro scale TiC particles are formed simultaneously.The structure of coatings transforms from dendritic to ring-like with the ad-dition of TiC,and the hardness of the substrate is increased by 4.5-7.8 times.The main wear form of coatings is adhesive wear.The refinement of microstructure and formation of multi-scale TiC have given rise to an increase in the resistance of the coating to plastic deformation,which reduces the degree of adhesion and improves wear resistance.Besides,the barrier effect of TiC particles to the electrolyte solu-tion in the passive film gives rise to the drop in corrosion current density.The Cr-rich stacking faults can provide nucleation sites for the formation and growth of passive films with high continuity and stability,thereby improving the corrosion resistance of the coatings.The superior anticorrosion and wear resis-tance properties of the composite coatings in this work have emphasized the merits of oscillating laser in fabricating high-performance coatings and would enlighten the design of more advanced composite coatings.展开更多
基金National Natural Science Foundation of China(Nos.51971121 and 52002228)National Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers(CN)(No.U2106216)Qingdao Marine Science and Technology Innovation Project(No.22-3-3-hygg-27-hy).
文摘The poor wear and corrosion resistance of aluminum alloys has led to the easy failure of surface perfor-mance.In this work,composite coatings of TiC/martensitic stainless steel(TiC/MSS)on aluminum alloy are fabricated by a novel approach of circular oscillating laser for enhanced surface performance of alu-minum alloys.The oscillation of laser leads to dense microstructure,and nano/micro scale TiC particles are formed simultaneously.The structure of coatings transforms from dendritic to ring-like with the ad-dition of TiC,and the hardness of the substrate is increased by 4.5-7.8 times.The main wear form of coatings is adhesive wear.The refinement of microstructure and formation of multi-scale TiC have given rise to an increase in the resistance of the coating to plastic deformation,which reduces the degree of adhesion and improves wear resistance.Besides,the barrier effect of TiC particles to the electrolyte solu-tion in the passive film gives rise to the drop in corrosion current density.The Cr-rich stacking faults can provide nucleation sites for the formation and growth of passive films with high continuity and stability,thereby improving the corrosion resistance of the coatings.The superior anticorrosion and wear resis-tance properties of the composite coatings in this work have emphasized the merits of oscillating laser in fabricating high-performance coatings and would enlighten the design of more advanced composite coatings.
