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6647950 
Journal Article 
CORROSION-RESISTANCE OF CARBON-STEEL IN HYDROFLUORIC-ACID ALKYLATION SERVICE 
Hashim, HH; Valerioti, WL; , 
1993 
0 
Materials Performance
ISSN: 0094-1492 
NATL ASSN CORROSION ENG 
HOUSTON 
50-54 
WOS:A1993MG04000012 
Carbon steel is the main construction material in hydrofluoric acid (HF) alkylation units and is corrosion resistant to anhydrous HF (AHF) below 71 degrees C. The resistance is a result of the formation of an inorganic iron fluoride scale on the carbon steel surface that protects the steel. However, there were several cases of accelerated and selective corrosion of piping components that were operating within prescribed process conditions. This led to extensive chemical and metallurgical examination of the steel components. Residual chromium, nickel, and copper were found to have pronounced influence on the corrosion resistance of carbon steel.