Below you can find possible alternatives for sodium chromate as an anticorrosion agent of the carbon steel in sealed circuit of gas absorption appliances.
Sodium Chromate
- EC-number: 231-889-5
- CAS-number: 7775-11-3
- Use: Sodium chromate as an anticorrosion agent of the carbon steel in sealed circuit of gas absorption appliances up to 0.70% by weight (as Cr6+) in the refrigerant solution
- Technical function: Anticorrosion agent
Alternatives:
Different (groups of) companies have researched possible alternatives to replace chromium trioxide. Even if these alternatives may not have been chosen for their particular case, they may still be an appropriate option for other cases.
- Soluble silicon compounds
- Rare earth metal salts (REMS)
- Molybdate
- Nitrite
- Zinc containing corrosion inhibitors
- Strong alkaline solutions
- Phosphates and phosphonate compounds
- Inhibitor 7 (cfr. Dometic GmbH application)
- Technical alternative: Replacement of GAHP technology – Electrical heat pumps
- Technical alternative: Replacement of GAHP technology: Condensing boiler
More detailed information
All research efforts by companies have been documented in reports. The following ECHA-dossiers are available about possible alternatives for sodium chromate as an anticorrosion agent of the carbon steel:
