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蒸餾水對鎂合金有腐蝕嗎?

2019-12-07 09:34 ?瀏覽:

除蒸餾水外,其他水均對鎂合金有一定的腐蝕作用。室溫下如果將鎂合金靜置于蒸餾水中,合金表面會很快生成一層保護性氧化膜,阻止進步腐蝕。如果在水中溶入少量鹽,特別是氯化物或重金屬鹽后,局部保護膜會遭到破壞并產生點蝕。無論是淡水還是海水,溶解的氧都不會對鎂的腐蝕產生很大影響,但是任何破壞或阻止保護膜形成的行為都會引起腐蝕。鎂合金在定量靜態水中的腐蝕速率可以忽略,但如果不斷更新水或通過離子交換器使Mg(OH)2總不能達到飽和溶解度,則腐蝕速率明顯增加。
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