MIL-DTL-16232G
however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 Preproduction inspection. Unless otherwise specified (see 6.2), a preproduction
inspection is required and shall be used to verify that the process complies with 3.2. Details of
the procedure, chemicals, test methods and frequencies, and the equipment proposed to be used
by the contractor shall be submitted in writing within 45 days after contract award to the procuring
contracting officer (PCO) and written approval from the procuring activity will be received in 45
days or prior to production. The exact designation of all materials proposed for use, together with
the names of the manufacturers, shall be stated. The proposed procedure shall include a
detailed method of control, with limits for time, temperature and pH values, and all other pertinent
details that will ensure compliance with the requirements of the specification. No deviation from
the approved process shall be permitted without prior written approval of the procuring activity.
Approval of process, materials and equipment implies no guarantee of acceptance of the results
obtained in use. Regardless of the processes or materials approved, the phosphate coatings
shall conform to all the applicable requirements of this specification.
3.2 Process. The phosphate coating shall be applied under the controls and in the stages
described below. A single contractor shall perform all phases of the cleaning and coating
process. Unless otherwise specified (see 6.2), phosphate coatings shall be applied after all
machining, forming, welding, and stress relieving heat treatment have been completed, but prior
to hydrogen embrittlement relief treatment.
3.2.1 Bath materials and controls. The bath materials and controls of the baths shall be in
accordance with the following:
a. The materials of the baths shall be capable of producing phosphate coatings
conforming to all requirements herein for the type and class specified
b. The bath concentration, temperature, and immersion time for parts shall be such
that the phosphate coatings meet all the requirements of this specification.
c. The equipment shall be constructed of materials resistant to the action of the
phosphating solutions and free from copper alloy fittings or brazing in contact with the solution.
d. Phosphatized parts shall not be allowed to dry between the phophatizing solution
treatment and the subsequent cold running water rinse. Fog sprayers or other means for
prevention of drying shall be provided.
e. The supplier of the phosphate coated parts shall maintain a permanent record
(see 3.2.1g) of the history of each phosphating bath, showing all additions of chemicals to the
bath, and the results of all analyses performed.
f. Control of the chemical content of the phosphate coating solutions shall consist of
determination of free acid, total acid and ferrous iron. Unless otherwise specified (see 6.2), the
frequency of testing for free acid, total acid and ferrous iron shall be made prior to starting
production and every four hours thereafter. High production rates may require more frequent
analysis to assure process control within established limits.
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