The role of hydrostatic pressure on the metal corrosion in simulated deep-sea environments — a review

This paper reviewed the corrosion behavior of metals in simulated deep-water environments and briefly discussed the effect of hydrostatic pressure on the different corrosion types for the active and the passive alloys. A consensus on the corrosion mechanism is that hydrostatic pressure accelerates the dissolution kinetics, changes the chemical compositions of the product layer or passive films, and promotes the adsorption of Cl− on the metal surface. In addition, a newly-developed mechanism that hydrostatic pressure facilitates the dissolution process by thinning the electric double layer was reviewed, the synergistic effect of hydrostatic pressure and tensile stress on the stress corrosion cracking was discussed, and the modified coating with chemical bonding interface to prolong the service life in this environment was introduced.