A new perspective on the corrosion of carbon steels in H2SO4 acid environments: Statistical analysis of corrosion mechanisms by response surface modeling

This study investigated synergistic effect of temperature, solution velocity, and sulphuric acid concentration on corrosion behaviour of carbon steel using response surface methodology. Electrochemical and surface charac-terisation techniques were employed. A statistically significant mathematical model was obtained, correlating corrosion rate to the environmental parameters. Temperature affected anodic reactions, while solution velocity influenced cathodic reactions. Acid concentration profoundly influenced corrosion mechanisms by altering deposition, dissolution, and properties of FeSO4 surface layer. The lowest corrosion rate was 0.546 mm/year at 35 degrees C, 98.5 wt%, 0 rpm, and the highest was 368.223 mm/year under 70 degrees C, 49 wt% and 500 rpm.

Automated summary

This study investigated the synergistic effect of temperature, solution velocity, and sulphuric acid concentration on the corrosion behavior of carbon steel using response surface methodology. The results showed that temperature affected anodic reactions, solution velocity influenced cathodic reactions, and acid concentration altered the corrosion mechanisms by changing the properties of the surface layer.