Comprehensive and Detailed Explanation From Exact Extract:
In HF Alkylation units, API RP 571 identifies certain residual alloying elements in carbon steel that can significantly increase corrosion rates in HF acid service.
The most detrimental residual elements are:
Chromium (Cr)
Copper (Cu)
Nickel (Ni)
These elements:
Disrupt formation of protective iron fluoride films
Increase general and localized corrosion rates
Are tightly controlled in carbon steel specifications for HF service
Referenced Documents (Study Basis):
API RP 571 – Section on Hydrofluoric Acid Corrosion
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