Zinc Yellow
Overview
Zinc Yellow is an inorganic pigment chemically known as zinc chromate. First developed in the early 20th century, it became widely used in corrosion-resistant coatings, particularly for aerospace and military applications. The pigment owes its characteristic lemon-yellow color to chromate ions within its crystalline structure. While zinc yellow was historically popular, its use has declined somewhat due to environmental regulations regarding hexavalent chromium content. However, it remains important for specialized applications where its unique combination of color and anti-corrosive properties are required.
Physical and Chemical Properties
Zinc Yellow typically appears as a fine, free-flowing powder with a bright yellow hue. The compound is thermally stable up to about 316°C, beyond which it decomposes. Its slight solubility in water (0.12 g/100 ml at 20°C) makes it suitable for water-based formulations with proper additives. The pigment exhibits excellent lightfastness (ASTM I) and good chemical resistance to alkalis, though it's susceptible to acid attack. Unlike some organic yellow pigments, zinc yellow maintains its color stability when exposed to heat, making it valuable for high-temperature applications.
Main Applications
The primary use of zinc yellow is in corrosion-inhibiting primers, especially for aluminum and steel substrates in aerospace, marine, and military applications. Its chromate content provides active corrosion protection by forming a passive layer on metal surfaces. In the artists' materials sector, zinc yellow appears in some professional-grade oil and acrylic paints, valued for its permanence. The plastics industry utilizes it for coloring PVC and other polymers where heat stability is required. Secondary applications include safety markings and specialized printing inks.
Safety and Storage
As a hexavalent chromium compound, zinc yellow requires careful handling with appropriate PPE including respirators, gloves and protective clothing. Work areas should have dust control measures and good ventilation to prevent inhalation exposure. Storage should be in sealed containers away from acids and organic materials. Spills must be contained and cleaned by professionals following hazardous materials protocols. Disposal must comply with local regulations for heavy metal-containing substances.
B2B Procurement Guide
When sourcing zinc yellow, verify the supplier's compliance with REACH and other regional chemical regulations. Specifications should include chromium(VI) content, purity levels, particle size distribution, and any surface treatments. Technical grade (98% purity) is typically sufficient for industrial coatings, while artists' grade requires finer particle size and stricter heavy metal controls. Consider lead times as some suppliers may only produce this pigment on demand due to specialized applications and regulatory constraints.
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