ETCHING AGENT AND REPLENISHING LIQUID
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United States of America Patent
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Jun 5, 2015
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Jul 8, 2014
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Abstract
Disclosed is an etching agent for steel. The etching agent is an acidic aqueous solution including ferrous ions, ferric ions, and an acetylene group-containing water-soluble compound. The concentration of ferrous ion A % by weight and the concentration of ferric ion B % by weight in the etching agent is preferably from 0.1 to 2.5. Also disclosed is a replenishing liquid that is added to the etching agent when the etching agent is continuously or repeatedly used. The replenishing liquid is an aqueous solution including an acetylene group-containing water-soluble compound.
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