Materials Performance

JUN 2016

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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13 NACE INTERNATIONAL: VOL. 55, NO. 6 MATERIALS PERFORMANCE JUNE 2016 THE BLOG Continued f rom page 11 Difference Between Painting and Coating Q: What is the difference between painting and coating? A: Tere are lots of diferent ways to look at this. Te terms are often used interchangeably, but some people at- tach specifc meanings. "Painting" is the most generic, but some people refer to it specifcally for decorative uses. Many people use "painting" to cover every thing. "Coating" can be used generically, or just for "protective" coatings that stop corro- sion or for "high tech" paints. You didn't mention " linings" that imply use inside of a tank or pipeline. A: Sometimes the expression of "painting" is used for lower thick- nesses, while "coating" and " lining" are used for higher thicknesses. Coatings are not only anticorrosion paints. Tere are diferent kinds of coatings for diferent purposes, such as mechanical protection coatings, fre protection coatings, water- proofng coatings, and anticorrosion coatings, which can be used on steel, concrete, and other substrates. A: Paint is any protective flm ap- plied over a surface with the in- tention of covering it and making it look good. Te main reason for the application is to beautif y a surface either inside or outside a structure. It usually has the ca- pabilities of being resistant to ultraviolet light and easy to clean. Paints have mini- mal chemical resistance based on the ty pe of resin used in their formulation. Another defnition is that paint is a liquid material containing a drying resin and pigments that, when applied to a suitable substrate, will combine with oxygen from the air to form a solid continuous flm over the substrate, thus providing a weather-resistant, decorative surface. A coating is a resin-based f ilm applied over a surface with the intention of pro- tecting against attack by a chemical envi- ronment, abrasion, heat exposure, or the combination of all the above. It is a clear or pigmented f ilm-forming liquid that protects the surface to which it is applied from the effects of the environment. A: Used in the context of the origi- nal question, the two terms only relate to the application process and are generally interchangeable for liquid paints. Te term "coating" can refer to a layer of any solid or liquid flm to a sub- strate or to the application of such a layer. Keeping only to our industry, the layer could, for example, be paint or powder fnish. "Painting" is a particular ty pe of coating application process, where the paint, varnish, lacquer, tar, etc. is applied in liquid form. So, in application terms: all painting is coating but not all coating is painting. In the material terms, all paints are coat- ings but not all coatings are paints. NACE International offers more than 400 books covering every aspect of corrosion control in all industries. For more information, visit the NACE Store at nace.org.

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