评估了超塑性锌铝合金在高温高湿环境下晶间腐蚀的程度.在铝含量为(1~22) mass%的范围内, 耐蚀性呈不单调变化.退火有利于提高耐蚀性. 退火温度达300℃时, 耐蚀性提高最多.晶间腐蚀深度由富铝相的百分比和晶粒细化两大因素综合决定.富铝相加速腐蚀, 而晶粒的细化作用则阻碍腐蚀.晶间腐蚀深度随腐蚀时间延长呈线性增长.
The corrosion rate of superplastic Zn-Al alloys in high temperature and high humidity environments was investigated. With mass fraction of Al in the range of (1~22) mass%, the corrosion resistance of the alloys varies unmonotonously. Annealing is favorable to increasing the corrosion resistance of the alloys. The alloys annealed 300℃ showed the highest increment in corrosion resistance. Intergranular corrosion depth is determined by two factors i.e. the fraction of Al-rich phase and the grain fineness. Al rich phase deteriorates the corrosion resistance while fine grains increase the corrosion resistance. Intergranular corrosion depth is linear to corrosion time.
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