Measures against discoloration and tarnishing of silver-plated items | Sulfide treatment, anti-sulfide treatment, storage methods
At Kodama Co., Ltd., we address yellow discoloration and blackening that occurs in silver-plated products, from investigating the causes to implementing discoloration prevention treatments. Silver easily reacts with hydrogen sulfide and sulfur compounds in the air, leading to the formation of black silver sulfide (Ag₂S) on the surface, which causes discoloration. Factors such as exhaust gases, rubber, cardboard, adhesives, sweat and sebum, and high-temperature and high-humidity environments also promote discoloration.
As countermeasures, we propose discoloration inhibitors (anti-sulfur treatments), chromate treatments, and simple rust prevention treatments. Furthermore, the use of anti-sulfur bags, avoiding direct contact with cardboard and rubber, and storing in environments that avoid high temperature and humidity are also important packaging and storage methods. We cater to terminals, connectors, busbars, contacts, EV and automotive components, and electrical parts. We can assist with everything from prototypes to mass production for matte silver, glossy silver, hard silver, super hard silver, and partial silver plating.

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