Improving corrosion resistance of missile igniters with polymer-based coatings

Deformation and corrosion of missile igniters caused a high rejection rate. A fine steel net is brazed to the thin metallic wall of the igniter. The brazing residue is corrosive. The major causes of corrosion were analyzed, and corrosion prevention by surface-modification of the igniters and various coatings and paints was investigated. The tests led to recommendations to prevent the corrosion of the new igniters and repair the corroded ones using acrylic urethane varnish and epoxy resin of high thermal stability as the adhesive. Other strategies for prevention of the corrosion failure and for improvement of the surface quality of the igniters are discussed.