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利用光学显微镜、扫描电镜及电化学工作站等设备对合金组织、电化学性能进行了表征,分析了固溶处理对Mg-0.5Zn-0.4Zr-5Gd(mass%)合金显微组织及腐蚀性能的影响。结果表明,固溶处理后,铸态组织中的析出相逐渐溶解,组织均匀,合金的力学性能得到提高,有效减小了基体和析出相之间电位差引起的电化学腐蚀,提高了合金的耐蚀性。合金经490℃固溶10 h后,抗拉强度为184.62 MPa,平均腐蚀速率为0.528 mm/a,其腐蚀电流密度和腐蚀电位分别为7.4μA/cm~2和-1.576 V,在研究范围内耐蚀性最好。
The microstructure and electrochemical properties of the alloy were characterized by means of optical microscope, scanning electron microscope and electrochemical workstation. The effects of solution treatment on microstructure and corrosion resistance of Mg-0.5Zn-0.4Zr-5Gd (mass%) alloy influences. The results show that after the solution treatment, the precipitated phase in the as-cast microstructure gradually dissolves and the microstructure is homogeneous, the mechanical properties of the alloy are improved, the electrochemical corrosion caused by the potential difference between the matrix and the precipitated phase is effectively reduced, Corrosion resistance. After the alloy was melted at 490 ℃ for 10 h, the tensile strength was 184.62 MPa, the average corrosion rate was 0.528 mm / a, and the corrosion current density and corrosion potential were 7.4 μA / cm ~ 2 and -1.576 V, respectively. Corrosion resistance is the best.