As a commonly used product in the field of anti-corrosion, epoxy zinc-rich primer is mainly gray, which is based on the color of zinc powder, and is easy to cover with other topcoats. Epoxy zinc-rich primer has excellent cathodic protection in industrial anti-corrosion coating, and is especially suitable for the protection of heavy anti-corrosion environments of steel structures. The coating of anti-corrosion engineering mainly uses composite coatings, such as primer-intermediate paint-topcoat structure, each coating gives full play to its own advantages, relying on comprehensive characteristics to protect the steel structure.
Epoxy zinc-rich primer is often coated with epoxy micaceous iron intermediate paint, the intermediate paint has strong adhesion, plays a transitional role, because most of the topcoat has a certain acidity, acid and zinc will react to form products that will lead to poor adhesion between layers, so it should be avoided that epoxy zinc-rich primer and anti-corrosion topcoat are directly used, and a middle paint can be applied to achieve better results.
The topcoat is the key to the overall coating protection, and the requirements for the topcoat must ensure a series of properties such as weather resistance, decoration, and solvent resistance. The commonly used supporting topcoats for epoxy zinc-rich primers mainly include fluorocarbon paint, acrylic polyurethane paint, polysiloxane topcoat, etc., and the determination of such topcoats is evidence-based.
The environmental analysis, corrosion type, light intensity, construction technology, anti-corrosion life and so on of the coating project are all very critical factors, and only after a comprehensive analysis can a reasonable coating product and supporting system be selected. Fluorocarbon paint has high weather resistance characteristics and long-term protection time; Acrylic polyurethane paint has cost advantages, excellent decoration and strong paint film; Polysiloxane topcoat has a high solid content, low volatile solvent and low pollution. Each topcoat has its own unique advantages, and it is only by combining the coating application and environmental requirements that it is possible to determine which topcoat is more appropriate.