to cover the surface of a metal object with a thin layer of a different metal, often silver, using electrolysis (= method that uses electric current)电镀(借助点解作用在金属制品表面沉积一层薄的金属或合金的方法)
electroplated brass电镀黄铜
electroplatenoun[ U ]uk/iˈlek.trəʊ.pleɪt/us/iˈlek.troʊ.pleɪt/