METHOD FOR ALKALINE CLEANING OF ZINC-MAGNESIUM-ALLOYED STRIP STEEL
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United States of America
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Mar 13, 2025
app pub date -
Nov 22, 2024
filing date -
Nov 22, 2024
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Abstract
The present invention relates to a method for the wet-chemical cleaning and conditioning of hot-dip galvanized (ZM) steel by contacting it with an alkaline aqueous composition containing magnesium ions dissolved in water, and at least one complexing agent. Also provided is a method for pre-treating strip steel by hot-dip galvanization (ZM) on one or both sides in order to protect the steel against corrosion, in which a cleaning according to the invention is followed by a wet-chemical conversion coating and a subsequent building of a varnish layer. The present invention also relates to an alkaline aqueous composition containing both magnesium ions and iron ions, which is particularly suitable for the cleaning and subsequent surface treatment for protection against corrosion, as well as to a system of complexing agents.
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