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Metalizing techniques

Apr 14, 2022 Shero Classroom
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How to make the containers shine and stand out among others?

Metalizing techniques
Metalizing is a commonly used secondary treatment method. So, what is metalizing? It is a technique to coat metal on the surface of objects. For the beauty industry, the technique is usually used for decorating the bottles and containers of the products. Except for decorating, metallic coating can also prevent the surface of the objects from being scratched.
Metallic coating types
In the beauty industry, there are three often used metalizing techniques: electroplating, vacuum metalizing, and anodizing.


What is electroplating (galvanic plating)?
Electroplating, also called galvanic plating, is the process of passing an electric current through an aqueous solution to coat a solid object with metal. Both the metal and the object need to be placed into the aqueous solution, the metal on the anode side and the object on the cathode side. And through the electrolysis reaction to achieve the electrodeposition over the object.
The advantages of electroplating
- Protect the object: electroplating can increase the objects' corrosive tolerance.
- Pretty appearance: electroplating can create a shine and luster finish.
The disadvantages of electroplating
- Non-uniform plating: there's a risk that electroplating may result in a non-uniform appearance.
- Environmental concern: The way of dealing with after-used aqueous solutions may increase the potential of environmental pollution.

Vacuum metalizing

What is vacuum metalizing?
Vacuum metalizing also called vacuum deposition or PVD coating, is a process of bonding the evaporated metal to the target object's substrate in a vacuum space. In general, in the beauty industry, this technique is used to coat the metal on the surface of the plastics.
The advantage of the vacuum metalizing
- An aesthetic appeal: The coating thickness of vacuum metalizing is thinner and more uniform than the electroplating.
- More choices in color: The color variation is greater than the electroplating.
- No chemical solution needed: Don't need the chemical aqueous solution during the process.
- Environmental friendly: It is an environmentally friendly technique. There's no use of a chemical aqueous solution so without potential environmental pollution.
- Recyclable: All the metalized plastics can be recycled.
The shortages of vacuum metalizing
- Melting point limit: The metals are limited by melting point.
- After-coating: It may need UV coating to improve the adhesion of metal to the target objects' surface.


What is anodizing?
Anodizing is a technique to increase the thickness of the natural oxide layer of the metal parts.

Anodizing uses the metal as an anode and soaks it in the electrolyte, then, put the cathode in the solution. As the current passed through the medium, the electrolytic passivation process converts the metals' surface into an anodic oxide finish. Aluminum parts usually use the technique to become decorative and corrosion-resistant in the beauty industry.
The advantages of anodizing
- Easy to maintain: It can simply be cleaned with water and detergents to keep the metal's luster.
- No-peeling: As the oxide layer is integral to the metal, the layer never peels or flakes.
- Color variations: Either by dying the object during the anodizing process or painting afterward.
The disadvantages of anodizing
- Only for specific metal types: Only specific grades of aluminum can be anodizing.
- High cost: The cost would be high if you have a small quantity.

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