湿热条件下超塑性锌铝合金的晶间腐蚀研究  

Intergranular Corrosion of Superplastic Zn-Al Alloys in High Temperature and High Humidity Environment

作　　者：沈磊[1] 宋振纶[1] 

机构地区：[1]中国科学院宁波材料技术与工程研究所,宁波315000

出　　处：《腐蚀科学与防护技术》2012年第2期153-157,共5页Corrosion Science and Protection Technology

基　　金：国家支撑计划项目(2009BAE71B05);宁波市重大科技计划项目(2008B10026)资助

摘　　要：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.

关 键 词：超塑性锌铝合金 腐蚀 湿热 

分 类 号：TG172[金属学及工艺—金属表面处理]