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工件在镀铬前必须经过活化处理,这在自动电镀线上尤其重要,国内电镀工艺大都采用稀硫酸活化。硫酸根离子是常规镀铬溶液的主要组份之一,保持其浓度在一定范围内将对镀层性能具有重大意义,通常这个范围很窄。在镍铁——铬、镍——铬、铜——镍—铬等装饰防护电镀线上,采用的传统稀硫酸活化的浓度一般为15克/升至30克/升。由于工件挂具的夹带,将使镀铬溶液中的硫酸根
Workpieces must be activated prior to chrome plating, which is especially important in automatic electroplating lines. Most electroplating processes in the country use dilute sulfuric acid for activation. Sulfate ions are one of the major components of conventional chrome plating solutions. Maintaining their concentration within a certain range will have significant implications for the properties of the coating, which is usually a narrow range. Conventional dilute sulfuric acid activation is typically used at concentrations of 15 g / L to 30 g / L on decorative guard plating such as ferronickel-chromium, nickel-chromium, copper-nickel-chromium and the like. Due to the entrainment of the workpiece hanger, the sulfate in the chrome plating solution will be made