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我厂生产一种用 H62黄铜制造的垫片,要求钝化处理。零件经前处理后,在铬酐5～10克/升、硫酸2～5克/升、食盐2～3克/升的溶液中,室温处理5～10秒,然后经水洗、烘干。随钝化时间不同,可获得由光亮的金属色彩到金黄带彩虹色的钝化膜。钝化处理后的零件在5%食盐溶液中浸泡20小时无锈蚀,能满足产品要求。同时溶液成本也由一般每升0.45元降到0.05元,并减少了污染。
I plant a gasket made of H62 brass, requiring passivation. Parts after pretreatment, chromic anhydride 5 ~ 10 g / L, sulfuric acid 2 ~ 5 g / L, salt 2 ~ 3 g / L solution, at room temperature for 5 to 10 seconds, and then washed and dried. With the passivation time is different, available from the bright metallic color to the golden band of iridescent passivation film. Passivated parts immersed in 5% salt solution for 20 hours without rust, to meet the product requirements. At the same time, the cost of the solution is also reduced from 0.45 yuan per liter to 0.05 yuan per liter and the pollution is reduced.