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Metal surface treatment: Hot-dip galvanizing, pre-treatment

2016-08-18View Original

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A few days ago I visited a galvanizing factory that produces hot-dip galvanized parts; it didn’t have a pre-treatment step – after pickling, the parts were simply dipped in waste acid from a waste acid tank before being put into the zinc bath. What’s the logic behind this? What’s the use of dipping in waste acid? Can the quality of the zinc coating be ensured without a pre-treatment?

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