MIL-STD-869D
Gun to work distance shall be established from the instruction manuals or bulletins, or by testing and analysis.
4.5 Cooling While Spraying. Part and coating temperatures must be controlled to prevent warpage of the substrate and failure of the coating. The maximum substrate temperature is:
350°F (176.6°C) for Steel
225°F (107.2°C) for Aluminum
The time at this temperature is not to exceed one (1) hour.
4.6 Selected Areas. If selected areas are to be flame sprayed, the surrounding areas must be masked with available tapes or masking compounds. Keyways and oil holes may be masked with carbon plugs or polished metal inserts or silicone rubber.
4.7 Coating Thickness. Some coatings have thickness limitations. Coating thicknesses shall be specified by applicable documents, if thickness is not specified then the finish machine coating shall not exceed 0.030 inch.
a. A minimum of 0.010 inch over final dimension shall be allowed for grinding. Follow manufacturer's recommendations.
b. For corrosion protection, a minimum coating thickness of 0.003 to
0.005 inch is required.
5. DETAILED REQUIREMENTS
5.1 Procedure.
spray.
a. All parts must be machined and cleaned if required prior to flame
b. High tensile steel and high strength aluminum part, which have been
pre-machined must be stress relieved by shot peening areas to be flame sprayed.
c. Areas to be flame sprayed, which have been plated shall have these finishes removed from area to be sprayed by either chemical or mechanical means. Blasting is not acceptable method of removal.
5.1.1 Vapor Degreasing. All parts shall be vapor degreased prior to surface preparation unless otherwise specified by engineering.
5.1.2 Masking. Mask all areas not to be abrasive blasted or coated.
5.1.3 Abrasive Blast. Abrasive blast areas, to be coated for the removal of oxidation, follow the manufacturer's recommended procedure and bulletins unless otherwise specified by engineering.
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