Aluminum triphosphate

Aluminum triphosphate (CAS 13939-25-8) is an inorganic aluminum salt used primarily as a corrosion-inhibiting pigment and pH buffer in protective coating systems. It functions by passivating metal substrates. This chemical slows electrochemical corrosion without relying on heavy metals such as chromate or zinc phosphate. In anticorrosive primers and industrial coatings, it acts as a non-toxic corrosion inhibitor.

It is ideal for steel and aluminum substrates, replacing chromate-based alternatives in compliance-sensitive formulations. Adhesive and sealant manufacturers incorporate it to improve adhesion to metal surfaces. The compound helps maintain pH stability in the cured system. In construction materials such as cementitious coatings and waterproofing membranes, it contributes to substrate protection and long-term durability.

Water treatment formulators use it as a buffering agent to control pH in treatment compounds and mineral-based process chemicals. It is supplied as a fine white powder suited for dispersion into liquid systems. The material is compatible with adhesive bases and dry-blended construction formulations. Technical grade is the standard commercial specification, with particle size distribution being a key quality parameter.

Buyers sourcing for coatings applications should confirm compatibility specifications. Performance varies with surface area and purity level for pigment-grade material in industrial manufacturing environments.