新型高铝青铜合金Cu-12Al-X的腐蚀行为

Corrosion Resistance of Novel High Al-Bronze Alloy Cu-12Al-X in NaCl Solution

以Cu-Al为基添加适量的Ni、Fe等在金属型模具中铸造一种多元铝青铜合金,利用失重法、扫描电镜、能谱仪(EDS)、X射线衍射仪等研究了固溶时效处理对该多元铝青铜合金腐蚀行为的影响。结果表明,该多元铝青铜合金在3.5%的NaCl溶液中主要发生脱Al腐蚀,腐蚀速率为0.029 5g/(m2·h),自腐蚀电位为-322mV,经过固溶时效处理(950℃×2h固溶+550℃×4h时效)后的显微组织由α、β′、γ2和k相组成;腐蚀速率为0.022 6g/(m2·h),自腐蚀电位为-236mV,具有较好的耐腐蚀性能。

A multi-element aluminum-bronze alloy was prepared by adding some elements（Ni.Fe） into the Cu-A1 based alloy in permanent mold casting. Effects of solid solution treatment on corrosion behavior of the Cu alloy prepared were investigated with the help of weight-loss tests, SEM （scanning electron microscope）, EDS （energy dispersedly spectrometer） and XRD （X-ray diffraction）. The results show that the dealuminzation corrosion is dominant in the 3.5 % NaC1 solution with corrosion rate of 0. 029 5 g/（m2 · h） and self-corrosion potential of -322 mV, while the microstructure of the alloy prepared is composed mainly of α、β′、γ2 and k phases after solid solution treatment （950 ℃ for 2 h and aging at 550 ℃for 4 h）, and its corrosion rate is O. 022 6 g/（m2 · h） with self-corrosion potential of -236 mV, ex- hibiting a satisfied corrosion resistance.