How can sports medals not be oxidized?

Games medals are not made of pure gold, pure silver or pure copper, but are generally plated with gold, silver and copper.

Since the medals you won are of poor quality, they should be made of alloy. The commonly used alloy materials are copper-nickel alloy, copper alloy, nickel-plated steel core, purple copper alloy and gold-copper alloy.

The daily collection of medals should pay attention to the following points to avoid oxidation:

First, it is not appropriate to touch them with hands. Often touched by hand, the medal surface will leave sweat and other substances, which is easy to cause oxidation. You should wear clean and weak cloth gloves or use tweezers to pick up medals.

second, it is not advisable to put medals in places with poor ventilation for a long time. Otherwise, in humid weather, the water vapor on the medal surface is difficult to play and is prone to oxidation.

Third, avoid contact with humid or polluted harmful gases. The rainy season in the south, hot weather and dirty environment, such as kitchens, are easy to corrode them.

Fourth, you can seal the medals one by one with a sheath, and then put them in an iron biscuit box and cover it with a little desiccant.

5. medals should be packaged individually and kept separately.

6. For the oxidized medals, you can add a small amount of toothpaste to the cloth, gently scrub it, remove the oxide layer, and put it in a sealed container for collection.