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Zinc plating with yellow chromate turning olive color

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  • Zinc plating with yellow chromate turning olive color

    I have had good results with zinc plating for the last few weeks until last weekend when the parts started to turn a darker, less brilliant color that the shiny gold appearance of before.
    The pH level was starting to go above 6 so I added hydrochloride acid to bring it down to 5.5. It acted like it was working faster but the end result was the same.
    Anyone else have this problem?
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