The application of chrome plating process is very extensive, and chrome plated rod is one of them. It refers to a layer of chromium element with a hardness of 50-60 formed by electroplating on the surface of silver steel support. So what are the chrome plating processes for chrome plated rods classified by purpose?

① Protective decorative chrome plating

Protective decorative chrome plating, commonly known as decorative chrome, has a thin coating that is bright and beautiful, and is usually used as a multi-layer coating

The outermost layer of electroplating must be coated with a sufficiently thick intermediate layer on a zinc or steel substrate to achieve protective purposes, and then coated with 0.25-0.5 on a bright intermediate layer μ Thin layer chromium of m.

② Hard chrome plating (wear-resistant chrome, chrome plated rod is this process)

The coating has extremely high hardness and wear resistance, which can extend the service life of workpieces, such as cutting and drawing tools,

Various materials such as compression molds and molds, bearings, shafts, gauges, gears, etc. can also be used to repair the dimensional tolerances of worn parts.

The thickness of hard chromium plating is generally 5-50 μ m. It can also be determined as needed, some up to 200-800 μ M.

Hard chromium plating on steel parts does not require an intermediate coating. If there are special requirements for corrosion resistance, different intermediate coatings can also be used.

③ Plating milk white chromium

The chrome plating layer is milky white, with low glossiness, good toughness, low porosity, and soft color. Its hardness is lower than that of hard chromium and decorative chromium, but it has high corrosion resistance, so it is commonly used in measuring tools and instrument panels. To improve its hardness, an additional layer of hard chromium can be plated on the surface of the milky white coating, known as double-layer chromium plating, which combines the characteristics of the milky white chromium plating layer and the hard chromium plating layer. It is commonly used for plating parts that require both wear resistance and corrosion resistance.

④ Plating porous chromium (porous chromium)

It utilizes the characteristic of fine cracks in the chromium layer, and after plating hard chromium, mechanical, chemical, or electrochemical pore loosening treatment is carried out to further deepen and widen the crack network. The surface of the chromium layer is covered with wide grooves, which not only has the characteristics of wear-resistant chromium, but also effectively stores lubricating media, prevents non lubricated operation, and improves the friction and wear resistance of the workpiece surface. Commonly used for coating the surface of sliding friction parts under heavy pressure, such as the inner chamber of internal combustion engine cylinder barrels, piston rings, etc.