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采用腐蚀形貌观察、动电位极化测试、电化学阻抗谱与腐蚀速度测试等方法系统地研究了高能电脉冲处理(EPT)和传统热处理(CHT)的电轧AZ31镁合金带材在3.5%NaCl(质量分数)溶液中的腐蚀行为。结果表明:高能电脉冲处理和传统热处理都能提高电轧AZ31镁合金的耐腐蚀性能,因为处理后的镁合金发生再结晶,位错密度降低;高能电脉冲处理与传统热处理相比,能更加显著地提高材料的综合力学性能,但是在改善材料耐腐蚀性能方面并不具有优势,这可能与高能电脉冲处理形成的更细小晶粒所形成更多的腐蚀微电池有关。
The effects of high energy electric pulse processing (EPT) and conventional heat treatment (CHT) on the electrical rolling of AZ31 magnesium alloy strip were studied systematically in terms of corrosion morphology, potentiodynamic polarization test, electrochemical impedance spectroscopy and corrosion rate test, Corrosion behavior in NaCl (mass fraction) solution. The results show that high energy electric pulse treatment and conventional heat treatment can all improve the corrosion resistance of AZ31 magnesium alloy because the treated magnesium alloy recrystallizes and the dislocation density decreases. Compared with the traditional heat treatment, It not only improves the comprehensive mechanical properties of the material, but it does not have the advantage of improving the corrosion resistance of the material. This may be related to the formation of more corrosion microcells formed by finer grains formed by high-energy electrical pulse treatment.