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根据微观结构及物相分析、静态失重法、极化曲线试验,研究了Zn及SiC_p对镁合金组织和性能的影响。结果表明,相比于Mg-8Zn-0.6Zr,Mg-12Zn-0.6Zr与SiC_p/Mg-12Zn-0.6Zr中Mg_7Zn_3相的含量及分布明显发生改变。对应的3种合金在90℃、3%的KCl溶液中的分解速率分别为2.30、5.62、7.24 mg·cm~(-2)·h~(-1)。分解过程中抗压强度随镁合金质量损失呈线性下降。分解速率提高的主要原因是α-Mg相的阳极溶解、微小粒子的脱离及腐蚀产物对分解过程无阻滞作用。
According to microstructure and phase analysis, static weight loss method and polarization curve test, the effects of Zn and SiC_p on the microstructure and properties of magnesium alloy were studied. The results show that the content and distribution of Mg_7Zn_3 phase in Mg-12Zn-0.6Zr and SiC_p / Mg-12Zn-0.6Zr obviously change compared with Mg-8Zn-0.6Zr. The decomposition rates of the three alloys at 90 ℃ and 3% KCl were 2.30, 5.62 and 7.24 mg · cm -2 · h -1, respectively. During compression, the compressive strength decreases linearly with the mass loss of magnesium alloy. The main reason for the increase of the decomposition rate is the anodic dissolution of the α-Mg phase, the detachment of the fine particles and the corrosion products without any retardation on the decomposition process.