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PICKLING METHOD FOR COPPER OR COPPER ALLOY WITH SUPPRESSED GENERATION OF GASEOUS NOX DURING PICKLING
PICKLING METHOD FOR COPPER OR COPPER ALLOY WITH SUPPRESSED GENERATION OF GASEOUS NOX DURING PICKLING
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机译:酸洗过程中气态氮氧化物生成受限的铜或铜合金的酸洗方法
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摘要
PURPOSE:To effectively suppress the generation of gaseous NOx during pickling by using a nitric acid bath into which a specific ratio of urea is incorporated for pickling of copper or copper alloy. CONSTITUTION:The copper or copper alloy is pickled by dipping the same into the nitric acid of 15-21% nitric acid concn. into which 2-5g/l urea is incorporated. The gaseous NOx generated in the stage of cleaning is decreased to about =1/10 the amt. of the case in which the urea is not incorporated into the bath by adding a specific ratio of the urea to the bath.
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