Effect of Surface Roughness on the Corrosion of HP-13Cr Stainless Steel in the Dynamic Aggressive Oilfield Environment

Abstract

The effects of surface roughness on the corrosion mechanism of HP-13Cr stainless steel in the dynamic aggressive oilfield environment were investigated through surface analysis, weight-loss measurements, and computational fluid dynamics simulations. The results showed that the surface roughness mainly changed the fluid state at the metal/solution interface. With the increase in the surface roughness, the vortex was more likely to form at the trough of the waves. The vortex could result in the deposition process and inhomogeneity in the thickness of the oxide film. The pitting corrosion occurred more easily. Furthermore, the temperature and CO2 pressure obviously facilitated the corrosion rate.

Keywords

• surface roughness
• flow-accelerated corrosion
• computational fluid dynamics
• temperature
• CO₂ pressure