Alkyds contain a binder that is based on resins. They are formed by the condensation of dibasic acid with polyhydric alcohols. Alkyds are polymers with an ester base.
Effective underwater hull coatings determine performance factors including, speed, fuel consumption, and weight of a vessel. Environmental regulations and performance life have been a major concern for underwater hull coatings known as antifouling coatings.
Epoxy & High-solids Coatings
Epoxy paints consist of two components that react with each other to form a hard, inert coating. High-solids coatings were developed to comply with more stringent volatile organic compound (VOC) regulations.
Exterior exhaust piping, boilers, economizers, and other high-temperature machinery and piping all require a corrosion-resistant barrier to protect the surface from the corrosion-prone or weather-exposed environments in which the equipment operates.
Metallic coatings are used for corrosion protection in two different ways. In one approach, the metallic coating functions as the cathode in the electro-chemical reaction. The other approach uses a metallic coating that serves as the anode in the electro-chemical reaction.
Polysiloxane laboratory testing has shown good gloss retention, color stability, wear resistance, and excellent corrosion prevention performance, leading the US Navy to adopt the chemistry as a replacement for its traditional silicone alkyd topcoat system used on ships’ freeboard and topside areas.
Polyurethanes are formed by the chemical reaction between a polyol and an isocyanate. Properties of 100 percent solid polyurethanes vary from very soft polymers to a very hard cast material.
Powder coating is a method used to apply a decorative or protective coating to a variety of materials in both industrial and commercial applications. The powder coating process involves the dry application of finely ground particles of pigment and resin to surfaces prior to a curing process. Curing typically involves baking the coating at temperatures above 120 degrees F.
Zinc Rich Coatings
Zinc-rich coatings and primers have the unique ability to provide galvanic protection to the steel surfaces to which they are applied. These coatings have a large amount of metallic zinc dust combined with the binder.