Effect of ammonium bifluoride on the corrosion rates of some common chemical cleaning solvents
Results are given for elevated temperature tests of the effects of ammonium bifluoride on corrosion rates of 5 and 10% solutions of inhibited citric, sulfamic, hydrochloric, and phosphoric acid scale solvents. Mild steel coupons were evaluated for weight loss after 12 hr exposures. The rate of attack for citric and sulfamic acid systems on steel decreased as concentration of ammonium bifluoride increased. The attack rate of HCL increased at lower ammonium bifluoride concentrations, but at higher concentrations tended to stabilize at a rate equivalent to that from 5% acid without ammonium bifluoride. The rate of 5% phosphoric acid attack decreased with increased concentration of ammonium bifluoride, but in 10% phosphoric acid, the rate increased with increased concentration of ammonium bifluoride. It is hypothesized that in citric and sulfamic acids the ammonium ion is inhibitive, but that in the more aggressive hydrochloric and phosphoric acids, the corrosion rates do not hold a relationship with ammonium bifluoride concentrations.
- OSTI ID:
- 6684121
- Journal Information:
- Mater. Performance; (United States), Vol. 17:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMMONIUM FLUORIDES
CORROSIVE EFFECTS
CITRIC ACID
CORROSION INHIBITORS
PERFORMANCE TESTING
PHOSPHORIC ACID
STEELS
CORROSION
SULFAMIC ACID
CHEMICAL REACTION KINETICS
CLEANING
QUANTITY RATIO
SCALING
ALLOYS
AMMONIUM COMPOUNDS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
ORGANIC ACIDS
ORGANIC COMPOUNDS
REACTION KINETICS
TESTING
360105* - Metals & Alloys- Corrosion & Erosion