First, let's compare the state of the switch terminals when they are initially soldered with the state after being left exposed for a period of time:
The materials of the switch terminals are mostly copper, with nickel plating, copper plating, silver plating, gold plating, etc. processes.
If the following environments are included: humid air, large amount of dust, coastal areas with salt content in the air, electrochemical corrosion environment (sulfur dioxide, ammonia gas...), oil stains, large temperature differences between hot and cold,
· The surface of copper or brass terminals gradually oxidizes, forming copper oxide and copper green, the color becomes darker, black, and develops green rust;
· The zinc layer of galvanized or iron terminals oxidizes and turns white, peels off, the base material rusts, and turns red-brown rust;
· The tin layer of tin-plated or silver-plated terminals oxidizes and turns gray, the silver layer sulfides and turns black (generally caused by sulfur compounds in the air).
For all environments with large temperature differences, Yueshi has conducted high-temperature and low-temperature tests for high-current swivel switches.
For the kitchen equipment environment with severe oil stains, Yueshi's IP68 dustproof and waterproof push-button switch is equipped with a button cover and an integrated shell, and the bottom is sealed with glue to deal with the harsh environment of different products.