To elucidate the underlying corrosion mechanism of selective laser melting(SLM)WE43 alloys,a detailed comparative analysis was conducted on the micro structure and corrosion behavior of WE43 Mg alloy in extruded,SLM,a...To elucidate the underlying corrosion mechanism of selective laser melting(SLM)WE43 alloys,a detailed comparative analysis was conducted on the micro structure and corrosion behavior of WE43 Mg alloy in extruded,SLM,and solution-treated states.The SLM WE43 alloy exhibits a mixed grain micro structure composed of columnar and equiaxed grains,with an average grain size of 3.64μm.Secondary phases are continuously distributed along melt track boundaries,and the dislocation density reaches up to 2.55 x 1014 m-2.SLM WE43 alloy,with a relative density of 99.47%,demonstrates the highest corrosion rate of 59.26 mm year-1,which decreases to 24.33 mm year-1 after solution treatment.In contrast,the extruded WE43 alloy exhibits the lowest corrosion rate of 6.26 mm year-1.While the extruded and solution-treated WE43 alloys primarily undergo pitting corrosion,the SLM WE43 alloy experiences 3D spatial corrosion due to microgalvanic corrosion of the secondary phases,high dislocation density,and rapid Cl-propagation in 3D defects,characterized by the corrosion products peeling off in successive layers.The study of the 3D spatial corrosion behavior of SLM WE43 alloy offers key insights into the rapid corrosion mechanisms of SLM-produced magnesium alloys.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2022YFC2406000)the National Natural Science Foundation of China(No.52375370)+6 种基金Guangdong Provincial Key R&D Program(No.2023B0909020004)Guangdong Basic and Applied Basic Research Foundation(Nos.2024A1515011024 and 2022B1515250004)Guangzhou Science and Technology Project(No.2024A04J4943)Guangdong Academy of Sciences Development Special Fund Project(No.2022GDASZH-2022010107)Guangdong province Science and Technology Plan Projects(Nos.2023B1212120008,2023B1212060045)Special Support Foundation of Guangdong Province(No.2023TQ07Z559)Shanxi Zhejiang University New Materials and Chemical Research Institute scientific research project(No.2022SX-TD025)
文摘To elucidate the underlying corrosion mechanism of selective laser melting(SLM)WE43 alloys,a detailed comparative analysis was conducted on the micro structure and corrosion behavior of WE43 Mg alloy in extruded,SLM,and solution-treated states.The SLM WE43 alloy exhibits a mixed grain micro structure composed of columnar and equiaxed grains,with an average grain size of 3.64μm.Secondary phases are continuously distributed along melt track boundaries,and the dislocation density reaches up to 2.55 x 1014 m-2.SLM WE43 alloy,with a relative density of 99.47%,demonstrates the highest corrosion rate of 59.26 mm year-1,which decreases to 24.33 mm year-1 after solution treatment.In contrast,the extruded WE43 alloy exhibits the lowest corrosion rate of 6.26 mm year-1.While the extruded and solution-treated WE43 alloys primarily undergo pitting corrosion,the SLM WE43 alloy experiences 3D spatial corrosion due to microgalvanic corrosion of the secondary phases,high dislocation density,and rapid Cl-propagation in 3D defects,characterized by the corrosion products peeling off in successive layers.The study of the 3D spatial corrosion behavior of SLM WE43 alloy offers key insights into the rapid corrosion mechanisms of SLM-produced magnesium alloys.
