Method for the selective removal of zinc ions from alkaline bath solutions in the serial surface treatment of metal components
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United States of America Patent
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Oct 15, 2019
Grant Date -
Aug 31, 2017
app pub date -
May 11, 2017
filing date -
Nov 13, 2014
priority date (Note) -
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Abstract
The present invention relates to a method for the serial surface treatment of metal components that have zinc surfaces, wherein the method comprises an alkaline pretreatment, and a method for the selective removal of zinc ions from an alkaline bath solution for the serial surface treatment of metal surfaces that have zinc surfaces. According to the invention, in order to perform each method, part of the alkaline aqueous bath solution is brought in contact with an ion exchange resin that bears functional groups selected from —OPO3X2/n and/or —PO3X2/n, wherein X is either a hydrogen atom or an alkali metal and/or alkaline-earth metal atom to be exchanged having the particular valency n.
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