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采用电化学Tafel极化曲线测量、阻抗谱测试和组织分析,确定了ZA35-0.3Sr合金适宜的稳定化处理工艺。试验结果表明,ZA35-0.3Sr合金经适宜稳定化处理后,消除了晶界ε相,大大减少了枝晶偏析,基本消除了非平衡β相,腐蚀电流密度相比于未处理前减小了75.69%。合金的耐蚀性增强的主要原因是稳定化处理时电荷转移导致反应过程的电阻增加和电极双电层电容的显著下降。ZA35-0.3Sr合金采用的稳定化处理工艺为350℃×4 h。
Electrochemical Tafel polarization curve measurement, impedance spectroscopy and microstructure analysis were used to determine the proper stabilization process of ZA35-0.3Sr alloy. The experimental results show that the ZA35-0.3Sr alloy, after being properly stabilized, eliminates the ε phase in the grain boundary, greatly reduces the dendrite segregation and virtually eliminates the unbalanced β phase, and decreases the corrosion current density compared with that before untreated 75.69%. The corrosion resistance of the alloy is mainly due to the charge transfer during the stabilization process leading to the increase of the resistance of the reaction process and the significant decrease of the electric double layer capacitance of the electrode. ZA35-0.3Sr alloy used in the stabilization process is 350 ℃ × 4 h.