zinc dihydrogen phosphate is an inorganic acid, which forms from a chemical reaction between zinc hydroxide and hydrogen phosphate ions. It is commonly used as a corrosion inhibitor in the electroplating industry and also in ceramic coatings.
The most common application of zinc phosphate is as a paint base in low-corrosion environments. It enhances paint adhesion, reduces the occurrence of paint-to-metal reactions, and forms a barrier between the substrate and the paint. It also helps prevent underfilm delamination and provides a corrosion-resistant finish to metal surfaces.
Another popular use of zinc phosphate is as an anticorrosive coating on metal components in the electroplating industry, particularly for brass, aluminum, stainless steel and copper. It has displaced lead-based and other toxic materials in the field and is considered one of the most effective corrosion inhibitors.
A more environmentally friendly alternative to zinc phosphate is iron phosphate, which can be used for high-corrosion applications. However, these coatings are typically heavier and more difficult to apply than zinc phosphate. This is because they require a thicker coat and a more durable bonding agent.
A third type of zinc phosphate coating is the zinc phosphate dental cement, which is used for luting permanent metal restorations such as crowns and bridges in a dentistry setting. It is a weaker and less durable material than resin-modified glass ionomer cements, which can be more convenient to use in the dental setting. This material can also be used as a base for other types of restorations.