Definition - What does Strontium Chromate mean?
Strontium chromate refers to a chemical compound that is a light yellow powder or granular solid and insoluble in water. Its chemical formula is SrCrO4.
Strontium chromate is a common corrosion inhibitor. It provides excellent corrosion resistance for metal substrates, particularly aluminum substrates. It is also used as a pigment, a protective coating, and in pyrotechnics. It has applicability as an anti-corrosive primer for zinc, magnesium, aluminum and alloys used in aircraft manufacturing.
Despite its beneficial properties, it creates environmental and health risks. An urgent strategy is needed to limit its environmental and health hazards.
Corrosionpedia explains Strontium Chromate
Strontium chromate is a crystalline and inorganic compound. When it is heating, toxic chromium fumes are emitted. It is a strong oxidizing agent and extremely corrosive, and has many applications, such as:
- Corrosion inhibitor in pigments
- Electrochemical processes to control sulfate concentration of solutions
- Colorant in polyvinyl chloride resins
- Chrome plating
- Aluminum flake coatings
- Metal conditioner
Since it is the most effective pigment grade corrosion inhibitor, chromium-based corrosion inhibitive pigments for coil, aircraft, vinyl wash and general primer coating applications are very common. Strontium chromate is also common as rust and corrosion-resistant pigment in paints, varnishes and oil colors. It is compatible with most binder systems. Strontium chromate is used as a coating for the protection of steel, aluminum and its alloys.
Strontium chromate is made from the reaction of strontium chloride with sodium chromate, or strontium carbonate with sodium dichromate. Strontium chromate corrosion inhibitors are highly toxic and carcinogenic, therefore their applications produce waste streams and create environmental risks and disposal issues. So, a corrosion-resistant inhibitor without chromate is desirable. In this case, corrosion-resistant magnesium hydroxide particles could be an alternative to chromate containing corrosion inhibitors.