FED-STD-791D
Method 5305.1
September 30 1986
CORROSIVENESS OF LUBRICANTS AT 232C (450F)
1. SCOPE
1.1 This method is used for determining the corrosive tendencies of lubricants at
high temperatures. It consists of immersing copper and silver strips in the sample at
232C (450F) for 50 h, and then examining them for weight change.
2. SUMMARY
2.1 This method duplicates an extended, high-temperature engine or gear box
environment. Copper and silver strips are exposed to the heated lubricant for 50 h and
carefully cleaned and weighed for loss of weight due to corrosive action resulting from
corrosive decomposition products being formed in lubricant.
3. SAMPLE SIZE
3.1 Approximately 400 mL of lubricant to be tested.
4. REFERENCES, STANDARDS AND APPARATUS
4.1 Oven, explosion-proof, 232 3C (450 5F).
4.2 Copper strip (ASTM B 152/B 152M), 3.8 cm x 3.8 cm x 0.16 cm (1-1/2 x
1-1/2 x 1/16 in).
4.3 Silver strip, pure electrolytic (99.9% purity), 3.8 cm x 3.8 cm x 0.32 cm
(1-1/2 x 1-1/2 x 1/8 in).
4.4 Beakers (2), borosilicate glass, Griffin low-form, 400 mL.
4.5 Supports (2), glass (for holding copper or silver strip vertically in beaker with
point contact, so that strip does not touch the sides or bottom of the beaker).
4.6 Balance, sensitivity 0.1 mg.
4.7 Electrolytic bath, carbon-rod anode, 0.5 A (min.), containing sulfuric acid
solution (5% by weight in distilled water) as the electrolyte.
4.8 Tongs, stainless steel.
4.9 Watch glass (2), 10 cm or larger.
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