Zinc silicate coatings are coatings that provide corrosion protection to surfaces such as steel . As the name suggests, this type of paint contains a lot of zinc metal dust mixed with a zinc silicate binder and also thick silicone or mixed topcoats and primers made of inorganic zinc.
The use of this type of coating and formulation to achieve steel protection is well known in the protective coating industry. Almost all zinc-based coatings are made with epoxy resin binders or inorganic silicates.
Zinc silicate coatings are also known as inorganic zinc-rich coatings or paints because they often contain a zinc silicate binder.
There are two main types of zinc-rich or zinc silicate coatings on the market, each of which differs based on the type of binder used in the production process.
Inorganic zinc-rich coatings usually contain a binder such as zinc silicate.
Organic zinc-rich coatings use polyurethane, butyl or epoxy resins.
After the zinc-rich paint is applied to the surface, the adhesive attaches to the zinc particles that are attached to the steel surface.
Contact between two dissimilar metals can lead to corrosion in primary cells in electrolyte-rich environments. The zinc particles act as the anode, while the steel becomes the cathode in the galvanic battery. The action of the galvanic cells causes the zinc to corrode while protecting the steel from galvanic corrosion.
Zinc silicate coatings are unique because they provide better protection for metal surfaces despite scratches, pinholes, voids and other imperfections. These coatings have the following properties:
Excellent mechanical properties, resistant to impact, scratches and abrasion.
Heat resistant up to 750°F (398°C).
Certain zinc-rich paint formulations may be submerged in salt water.
Due to its porosity, it is more difficult to apply than other types of paint.
For best results, the zinc silicate coating needs to be applied to a completely clean surface.
