Aluminum Surface Powder Coating.

Why Need Aluminum Surface Treatment?

Aluminum alloy surface is easy to produce a thin layer of alumina (0.01µm ~ 0.02µm), with a certain degree of corrosion resistance. However because it is amorphous, the original aluminum surface would be untarnished. In addition, this oxide film is loose and porous with poor corrosion resistance also easy to stain.Thus, thanks to great corrosion resistance, surface treatment is necessary to provide corrosion protection, decoration, and functionality of materials. According to the nature of the protective layer and process characteristics, aluminum surface treatment technology can be divided into anodising, electrophoresis, organic coating treatment. Organic coating treatment includes powder coating, fluorocarbon coating, and grain processing.The purpose of this articles is to introduce some normal methods of aluminum surface treatment: anodizing, electrophoresis and powder coating, and their strengths and weaknesses.
Examples of attributes that could be achieved by surface treatment include:
  • Colour
  • Hardness
  • Electrical Insulation
  • Wear Resistance

Powder Coating

What is Powder Coating

Powder Coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a “skin”.Powder coating is mainly used for coating of metals, such as household appliances, aluminum extrusions, drum hardware, and automobile and bicycle parts.( Wikipedia)

Merits and Demerits of Anodising:

Advantages
  • Energy Saving: Because of one-time film, it could increase 30-40% productivity and save about 30% energy.
  • Environmental Friendly: No organic solvent evaporation(without toluene, xylene, and other harmful gases) and release little or no amount of Volatile Organic Compounds (VOC) into the atmosphere.
  • Excellent corrosion resistance, chemical resistance than anodizing than oxidative coloring profiles
  • No risk of running or blistering coating.
  • More Colors Option
Disadvantages
  • Poor weather resistance
  • Easy to fall off powder
  • Susceptible to UV and strong sunshine and easy to discolor