The factory will do some passivation treatment when processing copper, mainly to prevent rust. The impurities have been removed from the processed copper, and the remaining copper is relatively fine, with a smooth and shiny surface

The surface discoloration of silver-plated copper wire in summer high temperature rainy season is more serious than that in other seasons. At the beginning, the surface of the silver-plated copper wire is red, and as time goes on, the surface of the silver-plated copper wire begins to turn black. In addition, it is found in the production process that the different thickness of the silver-plated copper wire will also affect the discoloration time of the silver layer. In fact, the anti-discoloration ability of the silver layer at room temperature is also improving, and excessive increase in the thickness of the silver layer will increase the cost, so we must avoid serious oxidation and discoloration of the surface of the copper.

Existing treatment methods Method: Processed silver-plated copper wire should not be directly touched by hand as far as possible, it can be stored in a dry and low-temperature acid-free environment first, and passivation anti-rust treatment should be done, because copper is a good thermoplastic, it will be deformed in a hot state, and the impurity lead content contained in it must be controlled, otherwise it will affect the deterioration of the hot processing performance of the alloy. Adding an appropriate amount of aluminum to the total brass can improve the strength and corrosion resistance of the brass.