Abstract
1. Two-layer chromium-nickel and chromium-nickel-cobalt coatings are recommended for protection of molybdenum from oxidation at high temperatures. 2. A method of molybdenum processing preparatory to plating was developed: cathodic degreasing in a solution consisting of 100 g/liter NaOH and 100 g/liter Na2CO3, at 70° temperature, with the current density being 10-5 A/dm2; and anodic etching in a 70% H2SO4 solution at 20°, and anodic current density of 10 A/dm2. 3. Molybdenum may be chromium-plated in an electrolyte containing 250 g/liter CrO3 and 2.5 g/liter H2SO4 at 55% with a current density of 25–30 A/dm2. 4. A process for nickelizing chromium-plated molybdenum surfaces was developed. Following a preparatory etching of chromium in 7–10% HCl at 40–45°, the specimens are nickelized in a rapid-action electrolyte −350 g/liter NiSO4 and 5 g/liter H2SO4 — at 80° and a cathodic current density of 10 A/dm2. 5. A method for depositing nickel-cobalt coatings containing 6, 12, and 50% Co chromium-plated molybdenum surfaces was developed and the corresponding electrolyte compositions selected.
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