Powder coating bears two meanings, as a noun and as a verb. As a noun it is a form of coat that is applied to substrates in its free-flowing dry powder state. As a verb however, it refers to the process of painting surfaces using free-flowing dry paint. Since it is applied in its dry state, there is no need of a solvent medium to keep the binder and filler in suspension form. When one requires the best powder coating Statesville NC is worth visiting.
The process of applying has three major sub-processes in it, that is, substrate pre-treatment, the application, and lastly curing. Pre-treatment is done to improve bonding of the coat on the substrate. The main technique of pre-treatment is abrasive blasting though there are several other techniques. Various abrasive blasting methods efficiently eliminate oil, welding scales, lubrication greases, soil, old paint, metal oxides and many other kinds of dirt.
Blasting might be insufficient in some circumstances because of the kind of surface or dirt. In such situations, chemical pre-treatment is the best alternative to go for. Chemical pre-treatment applies phosphates and/or chromates in applications like submersion and spray. The process entails various phases including de-smutting, degreasing, etching, and then the actual chromating or phosphating comes last. Chromates are however dangerous to the surroundings and are getting replaced by better chemicals.
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 a sensitive affair and needs the right devices to evade flaws defects and permit attainment of new styles in final products. Coating is loaded into the machine and is then sprayed on surfaces through guns. The guns emit fine sprays of dry paint onto substrates permitting the operator to determine how much coat is applied. The current market has several models of guns for diverse applications hence one might select one that fulfils their needs best.
Treatment of the surfaces after coat application is the last process. There are many curing processes and crosslinking is one of them. Crosslinking requires the coated substrate to be subjected to a given temperature for a certain time frame. The temperature causes the coating to form a polymer of a high molecular mass after melting and flowing out. After the polymer is attained, the coat exhibits given nice properties according to design. Typical curing temperature is 200 degrees Centigrade for 10 minutes.
Removal of powder coat requires use of chemical solutions namely, Methylene chloride and Acetone. These two chemical are effective and leaves no traces of the paint. However, Methylene chloride has recently been noticed to be a human carcinogen making it to be replaced with benzyl alcohol. The efficiency of Benzyl alcohol is also high.
The benefits of powder coatings over traditional paints are several and lack of sagging or running of thick applications is one of them. This characteristic is very important in some applications. This product is also friendly to the environment because it never emits VOCs.
The process of applying has three major sub-processes in it, that is, substrate pre-treatment, the application, and lastly curing. Pre-treatment is done to improve bonding of the coat on the substrate. The main technique of pre-treatment is abrasive blasting though there are several other techniques. Various abrasive blasting methods efficiently eliminate oil, welding scales, lubrication greases, soil, old paint, metal oxides and many other kinds of dirt.
Blasting might be insufficient in some circumstances because of the kind of surface or dirt. In such situations, chemical pre-treatment is the best alternative to go for. Chemical pre-treatment applies phosphates and/or chromates in applications like submersion and spray. The process entails various phases including de-smutting, degreasing, etching, and then the actual chromating or phosphating comes last. Chromates are however dangerous to the surroundings and are getting replaced by better chemicals.
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 a sensitive affair and needs the right devices to evade flaws defects and permit attainment of new styles in final products. Coating is loaded into the machine and is then sprayed on surfaces through guns. The guns emit fine sprays of dry paint onto substrates permitting the operator to determine how much coat is applied. The current market has several models of guns for diverse applications hence one might select one that fulfils their needs best.
Treatment of the surfaces after coat application is the last process. There are many curing processes and crosslinking is one of them. Crosslinking requires the coated substrate to be subjected to a given temperature for a certain time frame. The temperature causes the coating to form a polymer of a high molecular mass after melting and flowing out. After the polymer is attained, the coat exhibits given nice properties according to design. Typical curing temperature is 200 degrees Centigrade for 10 minutes.
Removal of powder coat requires use of chemical solutions namely, Methylene chloride and Acetone. These two chemical are effective and leaves no traces of the paint. However, Methylene chloride has recently been noticed to be a human carcinogen making it to be replaced with benzyl alcohol. The efficiency of Benzyl alcohol is also high.
The benefits of powder coatings over traditional paints are several and lack of sagging or running of thick applications is one of them. This characteristic is very important in some applications. This product is also friendly to the environment because it never emits VOCs.
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