Oxidizers & Peroxides
REACH
Chromic acid
CAS Number
7738-94-5
EC Number
231-801-5
What is Chromic acid?
Chromic acid (CAS 7738-94-5) is a strong inorganic oxidizing acid used primarily in metal surface treatment and industrial finishing operations.
Where is Chromic acid used?
- Metal finishing and electroplating: active constituent of hard chrome and decorative chrome plating baths
- Anodizing: electrolyte processes for aluminum where a thin, corrosion-resistant oxide layer is required
- Textile and leather: oxidizing bleach and surface modifier that improves dye uptake
- Mining and metals: passivation treatments that protect metal surfaces against oxidation during storage and transit
- It produces wear-resistant and corrosion-inhibiting coatings on various industrial components.
Good to know: 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.
Commercial specifications
- Technical grade
- Concentration typically specified by the buyer according to process requirements
Other Names (Synonyms)
Tetraoxochromic acid|Chromic(VI) acid|[CrO2(OH)2]|H2CrO4|Chromic acid (H2CrO4)|Acide chromique|SA8VOV0V7Q|dihydrogen(tetraaoxidochromate)
What are the physical properties of Chromic acid?
Melting Point 196 °C
Boiling Point 250 °C (decomposes)
Density 1.67-2.82 g/cm³
Appearance Chromic acid is a dark purplish-red odorless flakes or crystalline powder
Color Clear, orange
Odor Odorless
Form Liquid
Water Solubility HIGHLY Soluble
pH 3.03(1 mM solution);2.33(10 mM solution);2.06(100 mM solution)
How is Chromic acid classified and handled safely? Learn More
Danger
GHS03· Oxidizing GHS05· Corrosive GHS06· Toxic GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard
Hazard Statements
H271 May cause fire or explosion; strong Oxidizer
H300 Fatal if swallowed
H301 Toxic if swallowed
H310 Fatal in contact with skin
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P220 Keep away from clothing and other combustible materials.
P233 Keep container tightly closed.
Which trade and regulatory codes apply to Chromic acid?
UN Number 1463