Metal coating

metal coating on architectural metal structures

Metal coating for many purposes

Metal is one of the most common materials in many industries such as construction. automotive, ship building and electronics. Despite metal’s many beneficial properties, it is often necessary to improve them and protect the metal surfaces. Here metal coating has an important role.

Metal coatings protect metal and its alloys from hazard such as corrosion, chemicals, acids and oils.

The spectrum of different types of metal coating

In general, the term coating includes industrial and decorative products. Industrial coatings refer to those applied on objects during the production phase and decorative paints are those available for consumer and used for improving aesthetics of objects and surfaces.

The main hazard for metals is corrosion which is sometimes summarized into rusting.Therefore, most types of metal coating have corrosion resistant properties. Metals also abrade and wear with time: coatings also slow down this phenomenon.

An appropriate metal coating can extend the life expectancy of a surface.

Furthermore, for example in factory environments it is important that metal is immune to oil and chemicals whereas environments with high humidity require fungus and water resistant on metal.

One type of coating is often applicable on several surfaces. For example the following coating types are suitable also for metals and metal alloys.

  • Conductive coating;
  • High temperature coating;
  • Chemical resistant coating;
  • Powder coating.

Moreover, there are safety coatings which are applicable on metal surfaces. These include:

Industrial metal coating applications

Industrial metal coatings can be either liquid or powder coatings. However, the latter is more common due to the fact that it creates a somewhat more durable layer than liquid paints. Powder coatings are also more environmentally friendly due to their lower VOC content.

Liquid paints are often applied by roller or brush, at least in on-site applications. Additionally, there are many other application methods which are suitable for industrial use. These include:

  • Low pressure spray;
  • Airless spray (also for 2K systems);
  • Electrostatic spray (powder coating);
  • Automated applications;
  • Curtain coating;
  • Dip coating.

Many industrial coating also require a curing procedure. That usually involves high heat on the surface or chemical/ radiation application to harden and dry the coating.

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