Mechanical and corrosion properties of biodegradable Mg-1.5Mn-1Ca-xSr alloys

17th IUMRS International Conference in Asia

Sun, X.^1 ; Sun, S.Y.^2 ; Ning, Y.H.^1 ; Ning, Y.T.^3

Datang Northeast Electric Power Test and Research Institute, No. 3195 Weishan Street, Changchun Jilin

130000, China^1

Brand School of Engineering and Technology, Changchun Vocational Institute of Technology, Changchun

130033, China^2

State Grid Jilin Electric Power Company, No. 4969 Renmin Street, Changchun Jilin

130000, China^3

关键词: Barrier effects;    Corrosion mechanisms;    Corrosion process;    Dispersive distribution;    Grain size;    Mechanical and corrosion properties;    Mg matrix;    T4 treatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012049/pdf
DOI  :  10.1088/1757-899X/182/1/012049

来源: IOP

【 摘 要 】

The mechanical properties and corrosion mechanism of both as-cast and solution-naturally age (T4) treated Mg-1.5Mn-1Ca-xSr alloys were investigated. The results showed that Sr is helpful to decrease grain size and increase the strength. The corrosion process of alloys was mainly determined by the quantity and distribution of second phases. Mg17Sr2, α-Mn and Ca-Sr phases acted as cathodes accelerated the corrosion of Mg2Ca anodic phase and α-Mg matrix. However, continuous distributed Mg17Sr2was beneficial to resist the happening of localized corrosion because of its barrier effect. T4 treatment could significantly improve the mechanical properties and corrosion resistance of Mg alloys because of the dissolution of Mg2Ca phase and the dispersive distribution of Mg17Sr2and α-Mn phases.