在不同水化学条件下的高压釜中研究了Zr-4合金在LiOH水溶液中的耐腐蚀性能.结果表明,不同的腐蚀介质对氧化膜内的压应力和t-ZrO2的含量的影响有很大不同;Zr-4合金在LiOH或KOH水溶液中腐蚀时,Li+比K+进入氧化膜深而且浓度高;在LiOH水溶液中腐蚀时,氧化膜中OH-的浓度比在KOH水溶液中高.锆合金在LiOH水溶液中腐蚀时,氧化膜的生长主要是通过OH-从合金的表面向内扩散,与锆反应生成氧化锆和原子氢.Li+半径较小,容易进入氧化膜,因此较多的OH-进入氧化膜的深处,并与t-ZrO2中的氧空位反应,使t-ZrO2向m-ZrO2转变.这导致氧化膜出现裂纹,使氧化膜中的压应力松弛,降低氧化膜的保护能力,提高了锆合金的腐蚀速率.
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