触变成形和热处理ZA27合金在NaCl溶液中的腐蚀行为

摘要

The influence of corrosion on the microstructure of thixoformed and heat-treated ZA27 alloys was investigated.The microstructure of ZA27 alloy was affected by heat treatment.The process of electrochemical corrosion occurs in both ZA27 alloys through the area of η phase.According to the results of immersion test and electrochemical measurements,the corrosion rate of the thixoformed ZA27 alloy is at least 50％ lower than that of the thixoformed and thermally processed alloy.This indicates the unfavourable influence of applied heat treatment (T4 regime) on the corrosion resistance of the thixoformed ZA27 alloy.%研究触变成形和热处理ZA27合金在NaCl溶液中腐蚀后的显微组织的变化.结果表明,热处理会影响触变成形ZA27合金的组织.对经热处理和未经热处理的触变成形ZA27合金,电化学腐蚀均发生在η相区.浸泡试验和电化学测试结果表明,未经热处理的触变成形ZA27合金的腐蚀速率比经过热处理的触变成形ZA27合金的低50％,表明T4热处理会降低触变成形ZA27合金的耐腐蚀性能.