As we all know, galvanizing casters is actually a surface treatment technology that is coated with a layer of zinc on the surface of caster alloys, which is mainly for aesthetics and rust prevention. However, there are many ways to galvanize casters, and various methods of galvanizing are used in different places. The following universal wheels will introduce several methods for galvanizing casters.

1, cyanide zinc plating

Because cyanide (CN) is highly toxic, environmental protection puts forward strict restrictions on the use of cyanide in the electrogalvanization of caster hardware, and continuously promotes the development of the reduction of cyanide and the replacement of cyanide caster hardware. It is required to use low cyanide (microcyanide) caster hardware part electroplating solution. The quality of the caster hardware after electroplating using this process is good, especially the color can be maintained well after the color plating is passivated.

 

2, zincate zinc plating

zincate zinc plating process is evolved from cyanide zinc plating. At present, the two major factions formed in China are:

(1) "DPE" series of Wuhan Material Insurance Institute

(2) The "DE" series of the Radio and Television Station

Both of these are zincate zinc plating with alkaline additives; the PH value is 12.5~13. The lattice structure of the coating using this process is columnar, with good corrosion resistance, and is suitable for color galvanizing.

Typical formula: NaOH-110~120g/l; ZnO--11~12g/l; 94--5~7g/l. 94 is the product code name is the combination of "DPE-Ⅱ" and ethanolamine.

Note: After the product comes out of the tank —> water washing —> light (nitric acid + hydrochloric acid) —> water washing —> passivation —> water washing —> water washing —> scalding and drying —> drying —> aging treatment (80~90oC in the oven).

 

3, chloride zinc plating

Chloride zinc plating process is widely used in the electroplating industry of caster hardware, accounting for as high as 40%. After passivation (blue and white), zinc can be used to replace chromium (comparable to chromium plating). Especially after adding water-soluble varnish, it is difficult for laymen to distinguish whether it is galvanized or chromium plating. This process is suitable for white passivation (blue white, silver white). When the customer has no special requirements, it is better to choose silver passivation (the color remains relatively stable).

Typical formula: KCl--180~220g/l; ZnCl--65~75g/l; H3BO3--25~30g/l (buffer); PH value of 5~5.5; CI-87--15~20g/ l (brightener).

 

4, sulfate zinc plating

The sulphate zinc plating process is suitable for continuous plating (wire, strip, simple, thick and large parts, parts) with low cost.

Typical formula: ZnSO4--300~500g/l; H3BO3--25~30g/l; PH value: 4.5~5.5; zinc sulfide--15~20g/l (brightener).