Process for producing environmentally-friendly steel sheet for container material, environmentally-friendly steel sheet for container material, and laminated and pre-coated steel sheet for container material using the same
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United States of America Patent
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Sep 1, 2015
Grant Date -
Jan 31, 2013
app pub date -
Apr 6, 2011
filing date -
Apr 6, 2010
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Abstract
A method for the cathodic electrocoating of a tin-coated steel sheet in a treatment solution that does not contain any Cr compound, F or nitrite nitrogen. A tin oxide layer that is not subjected to a cathodic electrocoating treatment yet and is arranged on a tin-coated steel sheet is thinned to a specified thickness or less by a cathodic electrocoating treatment in an aqueous solution containing sodium carbonate or sodium hydrogen carbonate or an aqueous sulfuric acid solution immersion treatment, and the tin oxide layer is subjected to a cathodic electrocoating treatment in an aqueous solution of an alkaline metal sulfate containing a zirconium compound having a specified composition. In this manner, a coating film is formed on the tin oxide layer at a specific adhered amount in terms of Zr content.
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