The Properties and Applications of Molybdate
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- Category: Molybdenum knowledge
- Published on 14 March 2013
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Sodium molybdate has been used for many years as a substitute for chromates for the inhibition of corrosion in mild steels over a wide range of pH. Molybdates have a very low toxicity and are less aggressive oxidants than chromates toward organic additives that may be used in corrosion inhibiting formulations. A prime application is in cooling water in air-conditioning and heating systems to protect mild steel used in their construction.
Molybdates are used to inhibit corrosion in water-based hydraulic systems and in automobile engine anti-freeze.
Molybdate solutions protect against rusting of steel parts during machining.
Corrosion inhibiting pigments, primarily zinc molybdate, but also molybdates of calcium and strontium, are used commercially in paints. These pigments are white and can be used as a primer or as a tint with any other colour.
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