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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 degree of intergranular corrosion of superplastic zinc-aluminum alloy under high temperature and high humidity environment was evaluated, and the corrosion resistance showed a monotonous change in the range of (1-22) mass%. When the annealing temperature reaches 300 ℃, the corrosion resistance increases most.The depth of intergranular corrosion is determined by the percentage of the Al-rich phase and the grain refinement.The accelerated growth of the Al-rich phase accelerates corrosion, while the grain refinement obstructs the corrosion The depth of intergranular corrosion increases linearly with the extension of corrosion time.