Overview
Zinc chromate (CAS 13530-65-9 ), also sold as Zinc Chrome Yellow and Buttercup Yellow, is an inorganic chromate pigment used primarily for its corrosion-inhibiting properties in protective coatings.
It functions as an active anti-corrosion pigment rather than a purely decorative one, releasing chromate ions that passivate metal substrates and suppress underfilm corrosion in various industrial applications.
In aerospace and defense, zinc chromate is specified in primer systems for aluminum and steel airframe components where long-term corrosion resistance under harsh environmental exposure is critical.
Automotive OEM and refinish coatings use it in primer formulations applied to steel bodywork and structural parts requiring durable barrier protection and high-performance chemical resistance.
Industrial maintenance coatings for bridges, pipelines, and heavy steel structures incorporate it to extend service life in aggressive outdoor or chemical environments where metal integrity is paramount.
Printing inks and specialty packaging coatings also use it as a yellow pigment where color stability and substrate adhesion are formulation priorities for high-quality industrial printing projects.
Zinc chromate is supplied as a dry powder in varying particle size distributions to suit different coating formulations. It is available in technical and industrial grades for diverse manufacturing needs.
Specifications are typically aligned to ASTM standards referenced in aerospace and defense procurement. Packaging ranges from small drums to bulk quantities depending on specific volume requirements.
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Physical Properties
| Melting Point | 316 °C |
| Density | 3.40 g/cm³ |
| Appearance | Zinc chromate is a yellow crystalline powder. |
| Color | yellow prisms |
| Water Solubility | Insoluble in water. |
Safety & Handling
Danger GHS07 GHS08 GHS09 GHS06 Hazard Statements H302 Harmful if swallowed H317 May cause an allergic skin reaction H331 Toxic if inhaled H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H341 Suspected of causing genetic defects H350 May cause cancer H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P333+P317 Get emergency medical help. P342+P316 Get emergency medical help immediately. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed.
Other Names
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Chemical Properties
- CAS Number
- 13530-65-9
- EC Number
- 236-878-9
- Mol. Weight
- 181.4
- Category
- Pigments & Colorants