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    • 78. 发明申请
    • METHOD FOR PREVENTING ELUTION OF Bi FROM COPPER ALLOY
    • 从铜合金中预防铋的方法
    • US20130142691A1
    • 2013-06-06
    • US13817187
    • 2011-08-24
    • Tomoyuki Ozasa
    • Tomoyuki Ozasa
    • C23F1/18
    • C23F1/18B24C3/322C23F1/00E03B7/006
    • Provided is a method for preventing the elution of Bi from copper alloy, in which the elution of Bi is prevented in leadless copper-alloy plumbing equipment and the like containing a trace of lead and a predetermined amount of Bi. The present invention relates to a method for preventing the elution of Bi from copper alloy in which at least Bi present on the surface of copper alloy containing Bi is selectively removed by preferentially dissolving Bi in a 4 to 20 mass % concentration of nitric acid while suppressing Cu dissolution. Furthermore, elution of Pb is suppressed using a 10-20 mass % concentration of nitric acid. In this case, by removing at least Bi present on the surface of copper alloy containing Bi using nitric acid and then treating the surface of the copper alloy by shot-blasting corrosive products, such as oxides, produced from the nitric acid are removed, and gloss is imparted to the surface.
    • 本发明提供一种防止从铜合金中洗脱Bi的方法,其中在含铅铅和预定量的Bi的无铅铜合金管道设备等中防止Bi的洗脱。 本发明涉及一种防止Bi从铜合金中溶出的方法,其中通过优先将Bi浓缩至4〜20质量%的硝酸浓度来选择性除去含有Bi的铜合金表面上至少存在Bi,同时抑制 铜溶解。 此外,使用10-20质量%浓度的硝酸抑制Pb的洗脱。 在这种情况下,通过使用硝酸除去存在于含有Bi的铜合金表面上的至少Bi,然后除去由硝酸生成的喷射腐蚀性产物如氧化物来处理铜合金的表面,并且 光泽赋予表面。