Molybdenum News Center

Molybdenum Pigment

Molybdate-based pigments are used for two properties: stable colour formation and corrosion inhibition. Molybdenum oranges are prepared by co-precipitating lead chromate, lead molybdate and lead sulfate. They are light- and heat-stable pigments with colours from bright red-orange to red-yellow and are used in paints and inks, plastic and rubber products, and ceramics.Zinc molybdate is the basis of white corrosion inhibiting pigments which are used as paint primers.Molybdophosphoric acid is used to precipitate the dyes methyl violet and victoria blue.

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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