Terminal metal surface coating introduction

According to the function of the terminal products of our company, the following plating types are mainly required: nickel, bright tin, matte tin (stannous tin), gold and silver.

1.Galvanized

Zinc soluble in acid, but also soluble in alkali, it is called amphoteric metal. For steel, the zinc coating is anodic coating, which is mainly used to prevent the corrosion of steel. Zinc plating after passivation, dyeing or coating with a light agent, can significantly improve its protective and decorative. Such as screws, rails category.

2.Nickel plating

Electroless nickel is highly stable in the air. Due to the strong passivation ability of metallic nickel, an extremely thin passivation film can be quickly formed on the surface to resist the corrosion of the atmosphere, alkali and some acids. Electroless nickel crystals are extremely small and have excellent polishing properties that keep their luster over the long term in the atmosphere. Such as screws, squares, conductive parts;

3.Tinned

Tin is a silver-white metal, non-toxic, easy to weld, good electrical conductivity, good solderability and ductility, tin coating also has a corrosion-resistant role. Such as pin

There are two kinds of tin plating: bright tin plating and matte tin.

Bright tin: bright appearance, more attractive, smooth, crystal detail, not easy to stay fingerprints, the general thickness of 3um or more.

Matte tin: solderability and tin whisker resistance are better, the crystallization is relatively rough, easy to stay fingerprints, the general thickness of 5um, 8um range.

4.Gold plating

Gold-plated appearance of golden yellow, with high chemical stability, only soluble in aqua regia and other super acids, insoluble in other acids. Ductility, easy to polish, high temperature, with good resistance to discoloration. Has a low contact resistance, good electrical conductivity, easy welding, corrosion resistance, and has a certain degree of wear resistance. But also to ensure the integrity of the signal. Commonly used as tabletting class.

5.Silver

Silver-plated layer is very easy to polish, a strong reflective ability and good thermal conductivity, electrical conductivity, welding performance, silver-plated layer is much cheaper than the price of gold, chemical stability of organic acids and alkalis are also strong.