There is little study on the selection of liquid of pre - filming after the acid wash by hydroxy ethidine phosphonic acid (HEDP).
羟基乙叉二膦酸酸洗后预膜液的选有研,当的预膜钝化是防止酸洗后金属表面返锈的必要措施。
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Didn't acid wash go out before I was born?
在之,都有行过酸洗清洗吗?
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