Steel strip can be hot-dip galvanized in a continuous line. A third, declining method is to use low Z5 grade zinc. Lead is either added to primary Z1 grade zinc or already contained in used secondary zinc. Environmental regulations in the United States disapprove of lead in the kettle bath. Lead is often added to the molten zinc bath to improve the fluidity of the bath (thus limiting excess zinc on the dipped product by improved drainage properties), help prevent floating dross, make dross recycling easier and protect the kettle from uneven heat distribution from the burners.
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