Study on the mechanism of hydrostatic pressure promoting electrochemical corrosion of pure iron in 3.5% NaCl solution

The mechanisms of hydrostatic pressure promoting the electrochemical corrosion of pure iron in 3.5% NaCl solution were studied using electrochemical measurements and molecular dynamics simulation at different hydrostatic pressures. The main results show that hydrostatic pressure amplifies psi(1) effect by changing the Fe2+ profile at the metal/solution interface and decreasing the Helmholtz layer's thickness. It is the determinant of the enhancement of the iron dissolution rate at hydrostatic pressure. On the contrary, the adsorption of Cl- at the iron surface does not play an important role in the promoted corrosion process by hydrostatic pressure. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

The study found that hydrostatic pressure amplifies the psi(1) effect by changing the Fe2+ profile at the metal/solution interface and decreasing the thickness of the Helmholtz layer, leading to an enhancement of the iron dissolution rate. On the other hand, the adsorption of Cl- at the iron surface does not play a significant role in the corrosion process promoted by hydrostatic pressure.