Aerospace epoxy primers
- Process role: Active corrosion-inhibiting pigment in qualified primer systems
- Critical parameters: Pigment grade; particle size; coating/OEM qualification; Cr(VI) compliance
OGSCM / TECHNICAL PROCUREMENT INTELLIGENCE
Strontium Chromate (SrCrO₄)
Cr(VI) Corrosion-Inhibiting Pigment for Controlled Aerospace and Protective-Coating Applications
Strontium chromate is a yellow inorganic chromate pigment used primarily as an active corrosion-inhibiting component in selected aerospace and high-performance coating systems. It is not a generic yellow pigment: performance depends on pigment grade, particle characteristics, binder system and substrate, while Cr(VI) regulatory and occupational-exposure controls are central to procurement.
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CHEMISTRY, MANUFACTURING CONTEXT & MATERIAL BEHAVIOUR
SrCrO₄ contains chromium in the +6 oxidation state. In coating films, controlled chromate availability at the metal/coating interface contributes to passivation and suppression of corrosion reactions. Performance is formulation-dependent: pigment volume concentration, binder chemistry, pretreatment, film thickness, water uptake and substrate all influence corrosion protection. Strontium chromate therefore should be qualified as part of a complete coating system rather than purchased only by CAS number.
PROCESS-ENGINEERING & GRADE-SELECTION CONSIDERATIONS
- Do not treat all 'strontium yellow' products as equivalent. Confirm SrCrO₄ assay, pigment grade, particle-size distribution, oil absorption / dispersion behaviour where relevant, moisture and soluble impurities.
- For aerospace use, require the exact coating-system or OEM specification. The existence of qualified strontium-chromate primers does not mean raw pigment from any source is automatically aerospace-approved.
- Control dust aggressively. This is a Cr(VI) material; closed transfer, local exhaust ventilation, exposure monitoring and a current product-specific SDS should govern handling.
- Segregate and store according to the supplier SDS and local dangerous-goods rules. Regulatory acceptability must be checked for the destination and end use, especially where REACH-type restrictions apply.
◎ Technical Specifications
| Property | Value |
|---|---|
Formula |
SrCrO₄ |
CAS / EC |
7789-06-2 / 232-142-6 |
Molar mass |
203.61 g/mol |
Appearance |
Yellow to light-yellow crystalline powder / granular solid |
Density |
~3.9 g/cm³ (reference value) |
Water behaviour |
Sparingly soluble; solubility increases with temperature |
Thermal behaviour |
Decomposes on heating; do not use a simple '1,000°C melting point' as a procurement datum |
Functional role |
Cr(VI)-based corrosion-inhibiting pigment |
Commercial grade |
Producer-specific; define assay, particle size and soluble chromate / impurity limits |
INDUSTRIAL APPLICATION MATRIX
Protective primers for Al/steel/alloys
- Process role: Passivating corrosion inhibitor
- Critical parameters: Binder compatibility; PVC; substrate pretreatment; soluble chromate
Coil / specialty coatings
- Process role: Corrosion-control pigment in selected legacy/specialty systems
- Critical parameters: Dispersion; color; corrosion test requirement; regulatory status
Pigment applications
- Process role: Yellow inorganic pigment where legally and technically appropriate
- Critical parameters: Color strength; particle characteristics; end-use restrictions
QUALITY CONTROL, COA PARAMETERS & TEST FOCUS
Strontium chromate (SrCrO₄) assay and Cr(VI) content are determined using validated producer wet chemistry methods to verify chemical identity and active pigment content. Particle-size distribution is measured through laser diffraction or producer-approved methods to assess dispersion, film properties, settling behavior, and coating performance.
Moisture and loss on drying are evaluated through gravimetric analysis to ensure storage stability and formulation consistency. Water-soluble matter and soluble chromate are measured using producer-specific methods to assess leaching behavior and formulation response. Color, tint, and appearance are evaluated through colorimetric analysis or visual standards to maintain batch consistency. Impurity profiles are analyzed using ICP or validated producer methods to support formulation requirements and product qualification.
STORAGE, HANDLING, MATERIALS COMPATIBILITY & HSE
Strontium chromate is a hexavalent-chromium substance. Treat inhalation of pigment dust as a critical exposure pathway. Use engineering controls, appropriate respiratory protection where required by risk assessment, protective gloves/clothing, eye protection, controlled cleaning methods and compliant hazardous-waste management. Website text must never substitute for the current SDS or site Cr(VI) program.
PACKAGING, TRANSPORT & SUPPLY PLANNING FOR GCC / MENA
Commercial packaging is manufacturer-specific, commonly sealed bags or drums for pigment supply. Confirm UN-approved packaging where applicable, inner liner, net weight, palletization, moisture protection, dangerous-goods declaration, route restrictions and destination-country regulatory status before shipment.
Why Choose OGSCM?
Application-Driven Solutions
We match the right grade to your process needs.
Reliable Supply Chain
On-time delivery with strong regional & global logistics.
Quality You Can Trust
Strict quality control and batch consistency.
Expert Support
Technical & commercial support throughout your procurement journey.
Regional Presence
Serving industries across GCC and MENA with local expertise.
FREQUENTLY ASKED QUESTIONS
No. Its high-value industrial role is corrosion inhibition in selected coating systems; color alone is not an adequate procurement basis.
No automatic interchangeability should be assumed. Chemistry, solubility, toxicity, formulation response and qualification status differ.
No. Aerospace procurement must follow the approved coating formulation and OEM/specifier qualification route.
Cr(VI) compliance and exposure control are as important as pigment purity and coating performance.
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