Powder coating bears 2 meanings, first as a verb and then as a noun. When the word is used as a noun, it is a kind of coating that is applied onto substrates in a free flowing powder. However as a verb, it is the activity of painting surfaces with free-flowing paint. The product does not need solvent medium to maintain the binders and fillers in suspension form because it is applied in dry form. When one needs perfect powder coating Statesville NC is worth the visit.
The application process entails three main processes, that is, pre-treatment, actual application, and lastly curing. The pre-treatment process is meant to enhance the bonding between the coat and the substrate on which it is applied. There are many methods of pre-treating a surface but the major one is blasting. Various blasting processes effectively remove metal oxides, lubrication greases, welding scales, old paints, oil, soil, and other substances from surfaces.
In some situations, blasting may not suffice maybe due to the nature of the dirt or surface. In such cases, chemical pre-treatment would be a better option to use. Chemical pre-treatment involves the use of phosphates or chromates in spray or submersion applications. This process entails a number of stages including degreasing, etching, de-smutting, and then finally the actual phosphating or chromating. Chromates are however being discouraged with better chemicals coming into use because they are harmful to the environment.
Abrasive blasting is done using various substances that have low-tensile strength such as silicon carbide grit, silicon carbide shot, glass, and sand among others. The blast medium should be brittle, sharp, and suitably sized to avoid damaging the substrate while achieving great results. Plastic abrasive media is sometimes used on sensitive substrates such as aluminum to avoid causing damages. Generally, metallic materials are discouraged.
Application is sensitive and requires the right machines to avoid defects and allow achievement of new styles and designs in the final product. The coating gets fed into the equipment and is then applied on substrates through guns. The gun emits fine sprays of coat onto substrates allowing the operator to regulate how much paint is applied. The market has many kinds of guns for different applications hence one may choose one which suits their needs.
The last process after applying coat is substrate treatment. Crosslinking is among the many methods of abrasive blasting. Crosslinking requires coated substrates to be exposed to a given level of heat for a specified time period. Temperature causes coatings to form polymers of high molecular masses after melting and flowing. After polymer formation, the coat exhibits properties according to how it was designed. Two hundred degrees Celsius and ten minutes of exposure is the typical curing temperatures and time respectively.
Removal of the coat requires usage of chemical compounds like, Methylene chloride and Acetone. Methylene chloride and Acetone are efficient and abandons no paint traces behind. Methylene chloride has lately been identified as a possible human carcinogen and benzyl alcohol is being used in its place. The effectiveness of Benzyl alcohol is high too.
The advantage of powder coating over the ordinary paints is that it does not run or sag when applied thickly. This is a valuable property in some applications. It is also highly environmentally friendly due to its lack of VOCs.
The application process entails three main processes, that is, pre-treatment, actual application, and lastly curing. The pre-treatment process is meant to enhance the bonding between the coat and the substrate on which it is applied. There are many methods of pre-treating a surface but the major one is blasting. Various blasting processes effectively remove metal oxides, lubrication greases, welding scales, old paints, oil, soil, and other substances from surfaces.
In some situations, blasting may not suffice maybe due to the nature of the dirt or surface. In such cases, chemical pre-treatment would be a better option to use. Chemical pre-treatment involves the use of phosphates or chromates in spray or submersion applications. This process entails a number of stages including degreasing, etching, de-smutting, and then finally the actual phosphating or chromating. Chromates are however being discouraged with better chemicals coming into use because they are harmful to the environment.
Abrasive blasting is done using various substances that have low-tensile strength such as silicon carbide grit, silicon carbide shot, glass, and sand among others. The blast medium should be brittle, sharp, and suitably sized to avoid damaging the substrate while achieving great results. Plastic abrasive media is sometimes used on sensitive substrates such as aluminum to avoid causing damages. Generally, metallic materials are discouraged.
Application is sensitive and requires the right machines to avoid defects and allow achievement of new styles and designs in the final product. The coating gets fed into the equipment and is then applied on substrates through guns. The gun emits fine sprays of coat onto substrates allowing the operator to regulate how much paint is applied. The market has many kinds of guns for different applications hence one may choose one which suits their needs.
The last process after applying coat is substrate treatment. Crosslinking is among the many methods of abrasive blasting. Crosslinking requires coated substrates to be exposed to a given level of heat for a specified time period. Temperature causes coatings to form polymers of high molecular masses after melting and flowing. After polymer formation, the coat exhibits properties according to how it was designed. Two hundred degrees Celsius and ten minutes of exposure is the typical curing temperatures and time respectively.
Removal of the coat requires usage of chemical compounds like, Methylene chloride and Acetone. Methylene chloride and Acetone are efficient and abandons no paint traces behind. Methylene chloride has lately been identified as a possible human carcinogen and benzyl alcohol is being used in its place. The effectiveness of Benzyl alcohol is high too.
The advantage of powder coating over the ordinary paints is that it does not run or sag when applied thickly. This is a valuable property in some applications. It is also highly environmentally friendly due to its lack of VOCs.
About the Author:
When you are looking for information about powder coating Statesville NC locals should pay a visit to the web pages here today. You can see details at http://www.diversifiedfinishers.com now.
No comments:
Post a Comment