Chromic acid

Chromic acid (CAS 7738-94-5) is a strong inorganic oxidizing acid used primarily in metal surface treatment and industrial finishing operations. In practice, it exists as an aqueous solution of chromium trioxide and is sourced and handled in that form by most industrial buyers. In metal finishing and electroplating, chromic acid is the active constituent of hard chrome and decorative chrome plating baths. It produces wear-resistant and corrosion-inhibiting coatings on various industrial components.

Anodizing operations for aluminum use chromic acid electrolyte processes where a thin, corrosion-resistant oxide layer is required. This is particularly critical in specialized aerospace and defense applications. In the textile and leather industries, it functions as an oxidizing bleach and surface modifier. This improves dye uptake and prepares fiber substrates for various types of downstream processing.

Mining and metals operations use it in passivation treatments to protect metal surfaces against oxidation during storage and transit. This ensures the integrity of the metal before it reaches the end user. Chromic acid is supplied as an aqueous solution, with chromium trioxide dissolved in water to produce the active acid. Technical grade is the standard commercial form for most industrial applications.

Concentration is typically specified by the buyer according to specific process requirements. Industrial supply is subject to regulatory controls in many jurisdictions due to hexavalent chromium content. Buyers should confirm compliance documentation alongside standard quality specifications. Proper handling and storage protocols must be maintained to ensure safety and environmental protection during use.