Modification of Federal Test Method Standard Number 791C Method 5331.1 'Corrosion Protection of Steel against Sulfurous Acid-Salt Spray by Solid Film Lubricants'
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE
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A deficiency was uncovered in Federal Test Standard No. 791C Method 5331.1 Corrosion Protection of Steel Against Sulfurous Acid-Salt Spray By Solid Film Lubricants. It was determined that the potency of the sulfurous acid-salt spray rapidly diminished after the initial test cycle and thus was not consistent throughout the test procedure. A modification of this test procedure was established in order to insure consistent exposure of solid film lubricant- coated test panels. This involved the use of freshly prepared sulfurous acid- salt spray solution after test cycle and the redifinition of the test cycle as two hours salt spray exposure and twenty-two hours drying each period. Solid film lubricants conforming to MIL-L-8937 and MIL-L-23398 were evaluated using this new test procedure and found to meet the four cycle specification requirement with no evidence of visible corrosion, pitting or staining. JG
- Properties of Metals and Alloys
- Lubricants and Hydraulic Fluids