What is Coating and why it is used?


Coating in the context of corrosion is a thin layer of a coating substance, deposited or applied on the surface of any object. The coating is mainly used to improves its critical chemical and mechanical properties and creates a protective barrier against the deterioration of the surface of the object due to reaction with its environment.

The coating is categorized into two categories as organic and inorganic according to the nature of their bonding properties. The coating is to from the firsts cave drawings to Greek status and Chinese Artifacts, In the past time, the coating was used for decoratives and protection purposes.

The coating is common referred to as their generic resin types, such as Acrylic, Epoxy, Amine, and Polyurethane, where the Amine is used for cure. In many cases in coatings, coating ara applied for improving surface properties of the component substrate such as appearances, advisabilities, wettability, corrosion-resistant, wearing resistance, and scratch resistance properties.

Class or types of Coating:-

There are two classes of coating:-


  1.  INORGANIC       

These both may be integrated into a multifunctional coating system that has individually different chemical and mechanical properties.

1. Organic:-

 An organic coating is a type of coating whose primary ingredients are derived from either compound rich in carbon or vegetable or animal matter. The organic coating is a long durable surface protective coating that is applied to the substrate for decoratives or specific technical properties. The main component of the organic coating is responsible for the creation of good adhering protective film properties [(that is membrane), is organic compounds, polymers, oligomers, monomers, or and mixture of there. The organic coating contains carbon contents that are used to be made from vegetables or animal oil, Nowadays most of them refined petroleum products. Here take an example of organic coating like paints to receive lacquers and varnishes.

Organic coating

Advantages of organic coating-

  • Prevent the deterioration by creating a physical barrier between the surface of the object and the harmful substance from the Environment.

  • Improve and maintain appearance.

  • The organic coating theoretical life approximately 25 to 30 years.

2. Inorganic Coating:-

The Inorganic coating is encompassing surface conversion, anodizing, and enameling, metallic coating. The inorganic coating provided by chemical action, that is with or without electrical assistance. These coatings of the surface are creating through chemical reactions. When inorganic coating applies on the surface of the component, its treatments make the immediate surface layer of metal into a film of metallic oxide, which has better corrosion wear resistance than the natural oxides, film, and provides an effective surface protective base or key for supplementary protection, that is called paint.

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The inorganic coating includes porcelain enamels, glave lining, and metallic coating for improves surface protection against corrosion. The inorganic coating using a variety of techniques method for applying for an inorganic coating such as the hot dipping electroplating method, cladding method, thermal spray method, and many other methods.

Inorganic coating

The advantages of Inorganic coating:-

  • They have not brought out pollution.

  • They have not an organic solvent.

  • They do not make micro-organs.

  • In the case of inorganic repainting surfaces, it is not possible to discriminate against the change of colorations between old paint and new paints.

  • Ultraviolet (UV) radiation doesn't change the coloration.

  • They do not flake off.

  • Inorganic paint has micro crystallized textures with an admirable system aesthetic appearance and with the lower absorption of solar radiation.

properties of Coating /Why it is used? :-

They have a variety of properties to fulfill their role as a protective coating-

  • Chemical resistance.

  • Water resistance.

  • Ease of pollution.

  • Adhesion to the substrate.

  • Cohesive strength.

  • Flexibility and elongation.

  • Impact resistance.

  • Abrasion resistance.

  • Temperature Resistance.

  • Corrosion resistance.

  • Dielectric strength.

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