METHOD OF PREVENTING SILVER TARNISHING

摘要

PURPOSE: A method for preventing silver from tarnishing is provided to electroplate indium metal on the silver, thereby preventing the silver from tarnishing using an efficient and eco-friendly method. CONSTITUTION: A method for preventing silver from tarnishing includes: a step of feeding a substrate having a silver layer; and a step of electroplating an indium layer adjacent to the silver layer in order to forming a composite on the substrate. The composite of indium and silver has a contact resistance which is below a 5 mOhm. The composite is not heated. The contact resistance is 1 to 5 mOhm. The thickness of the indium layer is 0.5 to 50 nm. The concentration of indium ions in an indium electroplating bath is 0.5 to 10 g/L.