Water-soluble post-curing inorganic zinc-rich paint
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Water-soluble post-curing inorganic zinc-rich paint uses sodium silicate, also known as water glass, as a binder. This binder is mixed with zinc powder and applied to steel surfaces. Once the coating dries, an acidic curing agent such as dilute phosphoric acid H3PO4 is sprayed on to cure the coating. The function of the phosphoric acid curing agent is to react with sodium silicate to form silicic acid, with sodium phosphate as a by-product; the resulting silicic acid then reacts with zinc powder to form zinc silicate polymers. Sodium phosphate byproducts can dissolve in water and can be washed away with water after the coating cures. During the curing reaction, phosphoric acid can also react with zinc powder to form insoluble zinc phosphate, thereby increasing the density of the coating. As it continuously sacrifices itself, zinc powder also reacts with CO2 and water to form insoluble basic calcium carbonate, which provides shielding protection for the coating.
Water-soluble post-curing inorganic zinc-rich paint primarily uses sodium silicate (water glass) as a binder, which is mixed with zinc powder and applied to the surface of steel. After drying, dilute phosphoric acid is sprayed as a curing agent to trigger a reaction that produces silicic acid and sodium phosphate, the latter of which is soluble in water. Furthermore, phosphoric acid and zinc powder also form insoluble zinc phosphate, increasing the density of the coating. Zinc powder can also react with CO2 and water to form basic calcium carbonate, which helps protect the coating. .