Coatings on IndustryNet

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Term “coating” is general and covers all types of products that producers of paints and varnishes offer on the market.Actually, a coating is a type of covering that is applied to the surface of an object, in order to protect or decorate it.There are two main types of coatings:

• The one that totally covers the substrate

• The one that only covers part of the substrate

A product label on many types of drinks bottles where one side has an all over functional coating and the other side has one or more decorative coatings in a specific pattern to form the words and images, are a great example of all types of coatings.

Probably the most famous coatings are varnishes and paints that have a lot of uses – they protect the substrate and are very decorative.Of course, some paints that artists use, are only for decoration, while some others are only for preventing corrosion (large industrial pipes, for example).

Today coatings will usually use to change the surface of the substrate like:

- Corrosion resistance

- Adhesion

- Wear resistance

- Water resistance and lot more.

How coatings are applied?

The most important thing in the process of coating is that it needs to be applied at a specific, controlled thickness. You can achieve that control with different kind of tools such as painting brush for a wall, or expensive industrial machines that applying all types of coatings in a specific thickness and speed.

Coatings may be applied as:

- Liquids

- Gases

- Solids

Liquid coating

Liquid coatings have a few advantages over powder coating, such as not forming as heavy or thick like powder coating, and it can be used for any surface type without the use of heat, like for powder coating.Liquid coating is mostly used for small batches, that are done fast.

Gas coating

Gas coatings are made from a mixture of the high-purity metals like aluminum, titanium, and chromium and reactive gasses like nitrogen or a carbon based gas. The metals are first evaporated with extreme heat, or bombarded with ions and turned into vapor, and then they are mixed with nitrogen or carbon based gas. The result is a metal vapor compound, which is applied as a thin tool coating.

Solids

Standard, liquid coating, is made of around 25% solids and 60% solvents. On the other hand, solids come as a different concept, with very little or no solvent at all.Very high solids coatings come with 100% solid content. Thanks to this percentage of solids, these coatings are 3 to 4 times thicker.The absence of solvents, which in traditional paints come as a compensation for viscosity, flow and curing, makes the solids coatings come with quite different characteristics, and need new methods of applying and handling.

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