Selection principle of electroplating hanger material

The material of the hanger can be differentiated according to each process stage and different plating types. The key point of the selection basis should consider the conductivity, corrosion resistance and strength of the material within the process range Requirements, while also taking into account the necessity and economic rationality.

Which material should be used for the hanger for lye degreasing?

There are relatively few hangers used for lye degreasing, usually tied with wire or installed in a basket. However, no matter what form of loading is used, ferrous materials can be used. If the lye is degreasing, the acid etching process is transferred with the hanger, and the corrosion resistance requirements are often considered at this time. However, if only the film is removed, it can be removed in a short time, it will not cause excessive corrosion, and there is no need to replace the original hanger or the original binding material.

Which material should be used for the acid etching hanger?

Acid etching is similar to lye degreasing, and the use of hangers is relatively small. Most of them are loaded with baskets or lashing. If the surface of the workpiece is not severely rusted, iron can also be used. If the oxide scale is thicker, it is appropriate to choose titanium or stainless steel.

It is not allowed to use copper hangers, baskets or copper wires to bind the etched parts in the acid. If the acid is contaminated by copper ions, it will lose its effectiveness, otherwise it will cause replacement on the surface of the iron etched parts. Copper layer, which affects the bonding strength of the plating layer.

Which material should be used for the hard chrome plating hanger?

Hard chromium plating can choose iron and copper combination hangers, that is, iron is used below the liquid level, and iron ions are mixed into chromium plating during reverse plating before hard chromium plating. After solution, its influence is much smaller than copper ion. The maximum allowable value of iron in the chromium plating solution can reach 10g/L, while the maximum allowable value of copper is 5g/L, and the strength of iron is better than copper, and it is easy to fix Artifact.

In order to improve the electrical conductivity of the hanger, it is meaningful to use copper for the main rod and hook above the liquid level. The connection points can be brazed or riveted and used after insulation.

Which material should be used for decorative chrome-plated hangers?

Decorative chrome-plated small pieces should be bound with thin copper wires plated with a thin layer of nickel or thin layer of chromium. For larger pieces, if there are clips (holes or concealed places), nickel-plated or The chromium phosphor copper wire hanger clip should not be used again when the hanger has an excessively thick chromium layer, otherwise it may affect the chromium layer around the hanger.

This kind of hanger must be washed before it is used every other day.