Phosphate Coating: Light
Specification covers cleaning methods and pre-treatment processes
Type I: Intended as a general all-purpose pretreatment prior to painting.
Type II & IV: Intended primarily for use where metal parts are to be formed after painting.
Type III: Intended for use where size and shape preclude using types I, II or IV and where items containing mixed metal components are assembled prior to treatment.
Note: Cleaning material shall not contain any chemical which is classified in the Clean Air Act Amendments of 1990 as a Class I or Class II ozone depleting substance.
Light coating for use as a paint base.
Method I: Mechanical or abrasive cleaning (for ferrous surfaces only).
Method II: Solvent cleaning.
Method III: Hot alkaline (for ferrous surfaces only).
Method IV: Emulsion.
Method V: Alkaline de-rusting (for ferrous surfaces only).
Method VI: Phosphoric acid.
Type I: Zinc phosphate. Class 1 - spray application (150mg/sq. ft. min.; 500 mg/sq. ft. max.) Class 2A - Immersion or Dip application (300mg/sq. ft. max.); Class 2B - Immersion or Dip application (600mg/sq. ft. min. to 1000mg/sq. ft. max.)
Type II: Aqueous Iron Phosphate (35mg/sq. ft. min.)
Type III: (.0003"- .0005") Organic pretreatment coating (unless otherwise specified, MIL-C-8514 or DOD-P-15328).
Type IV: Non-aqueous iron phosphate (35mg/sq. ft. min.)
Type V: Zinc phosphate (500mg/sq. ft. min.; 1000mg/sq. ft. max.)