What Does Polymeric Coating Mean?
Polymeric coatings are coatings or paint made with polymers that provide superior adherence and protection from corrosion.
The polymeric coating process applies an elastomer or other polymeric material onto a supporting substrate. Examples of polymeric coatings include:
- Natural and synthetic rubber
- Polyvinyl chloride
- Acrylic, epoxy, silicone
- Phenolic resins
Polymer coatings can be applied to metals, ceramics as well as synthetic materials. They are temperature-resistant up to approx. 535°F (280°C) and FDA-approved and are therefore used primarily for food production (e.g. containers, multi-head scales, frying pans).
Applying a polymeric coating to a metallic surface increases the ionic resistance.
Corrosionpedia Explains Polymeric Coating
Polymeric coatings made from polymeric materials can be applied on a variety of substrates using a number of different techniques such as extrusion/dispersion coating and solution application.
Polymeric coatings designed for corrosion protection are usually tougher and are applied in heavier films than are appearance coatings. Polymeric coatings are required to adhere well to the substrate and must not chip easily or degrade from heat/moisture/salt, or chemicals.
Polymeric coatings are replacing chrome and cadmium coatings partly due to increasing concern about heavy metals and environmental factors. The use of special polymers in coatings allows the creation of hydrophobic surfaces and the effective prevention of the sticking of various substances such as adhesives/rubber/synthetic materials to these surfaces. The targeted alteration of the surface structure using defined roughness profiles enhances the non-stick effect by reducing the contact area (e.g. Teflon coating, PTFE, PFA).
Some polymeric coatings include:
- Acrylics and alkyds - Widely used for farm equipment and industrial products requiring good corrosion protection at a moderate cost
- Polyurethane - Used on conveyor equipment, aircraft, radomes, tugboats, road-building machinery, and motorcycle parts. Abrasion-resistant coatings of urethanes are applied on railroad hopper cars, and linings are used in sandblasting cabinets and slurry pipes.
- Nylon 11 - Provides attractive appearance as well as protection from chemicals, abrasion, and impact
A new class of coating, an alloy of fluoropolymer and other resins, has a different viscosity behavior than that of the earlier organics. The viscosity of "fastener-class" coating resins decrease sharply as film shear increases.