MIL-DTL-16232G, DETAIL SPECIFICATION: PHOSPHATE COATING, HEAVY, MANGANESE OR ZINC BASE (07 JAN 2000) [SUPERSEDING DOD-P-16232F AND MIL-P-16232E]., This specification covers two types of heavy phosphate coating for ferrousmetals, applied by immersion. The coatings consist of a manganese phosphate or zincphosphate base and, when specified, a supplementary treatment (see 6.1).