Low lead or no lead batch galvanization process
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United States of America Patent
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Aug 21, 2001
Issued Date -
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app pub date -
Jun 30, 1998
filing date -
Jun 30, 1998
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Abstract
A batch process for making galvanized steel products with a low lead or no lead zinc coating is described. Metal parts are cleaned, rinsed, pickled and rinsed and are immersed in a hot, pre-flux solution and thoroughly dried before they are immersed in a molten zinc bath. The dryer system includes a mechanism for rotating the batch of parts as they are dried. In one embodiment of the invention, a batch of steel pipe is dried by hot air having a maximum temperature of 125.degree. C. The descrambler system rotates the pipe and moves the pipe in contact with the divider apparatus to separate the pipe in the dryer. The pipe, thoroughly dried, is immersed into a molten zinc bath having less than 0.05% by weight lead, and the use of a top-flux on the molten zinc bath is optional.
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