Overview
Strontium Yellow Pigment, chemically known as Strontium Chromate (SrCrO4), is a bright yellow inorganic compound primarily used for its corrosion-inhibiting properties. It is synthesized through the reaction of strontium chloride with sodium chromate. The pigment is valued in industrial applications for its stability under UV exposure and resistance to chemical degradation. Due to its toxicity, regulatory restrictions apply in some regions, particularly under REACH and OSHA guidelines. Manufacturers often substitute it with less hazardous alternatives in consumer products, but it remains critical in aerospace and marine coatings where performance outweighs safety concerns.
Physical and Chemical Properties
Strontium Chromate appears as a fine, bright yellow powder with a density of 3.89 g/cm³. It is slightly soluble in water but reacts with strong acids, releasing toxic chromium compounds. The pigment exhibits excellent thermal stability, retaining its color up to 550°C, making it suitable for high-temperature applications. Its corrosion inhibition mechanism involves the slow release of chromate ions, which passivate metal surfaces. This property is leveraged in zinc-rich primers and coatings for aluminum alloys. However, its solubility in water can lead to environmental concerns, necessitating careful disposal and handling.
Main Applications
The primary use of Strontium Yellow Pigment is in anti-corrosive coatings, especially for aluminum substrates in aerospace and automotive industries. It is a key component in wash primers, providing adhesion and corrosion resistance for subsequent paint layers. The pigment is also used in vinyl resins and epoxy systems for industrial equipment. In aerospace, it meets stringent MIL-PRF-23377 standards for primer coatings. Smaller quantities are employed in artists' paints and specialty plastics, though alternatives like zinc chromate are increasingly preferred due to toxicity concerns.
Safety and Storage
Strontium Chromate is classified as a Category 1B carcinogen under EU CLP regulations. Inhalation or ingestion can cause severe respiratory and kidney damage. Handling requires NIOSH-approved respirators, gloves, and fume hoods. Spills must be neutralized with reducing agents like sodium metabisulfite. Storage mandates airtight containers in ventilated areas, segregated from acids and organic materials. Transport regulations vary by region; in the U.S., it falls under DOT Hazard Class 5.1 (oxidizer). Disposal requires licensed hazardous waste facilities due to chromium(VI) content.
B2B Procurement Guide
When procuring Strontium Yellow Pigment, verify the CAS number (7789-06-2) and request a Safety Data Sheet (SDS) compliant with GHS standards. Key specifications include purity (typically 95–98%) and particle size (1–10 microns). Bulk pricing often drops for orders exceeding 500 kg. Suppliers should provide batch-specific certificates of analysis (CoA) testing for heavy metals and solubility. Due to regulatory constraints, some manufacturers offer pre-approved formulations for specific industries. Consider lead times, as production may require compliance documentation.
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