Chromate‐Free Intermediate Primers for Aerospace Applications: Hydraulic‐fluid resistant, coating for external corrosion‐protection treatment of aircraft

AN intermediate primer that is free of chromates yet fully resistant to attack by aircraft hydraulic fluids and with a lower water permeability than chromate‐containing alternatives is now available from the Netherlands‐based Akzo Coatings. Consisting of modified phosphate pigments in an epoxy polyurethane carrier, the primer offers the corrosion protection and paint‐curing reactivity of conventional primers but without their associated health hazard risks. This is of considerable importance both in view of labour safety during manufacture, and freedom in application.