Effect of Hydrostatic Pressure on the Corrosion Behavior of Pure Nickel

Abstract

The effect of hydrostatic pressure on the corrosion behavior of nickel in NaCl solution was investigated by electrochemical measurements and OM/SEM observation. The increasing hydrostatic pressure deteriorated the pitting corrosion resistance of nickel, distinguished by the decrease of critical pitting potential (Ecirt) with increasing passive current density. The results also demonstrated that hydrostatic pressure had three effects on the corrosion behavior of nickel: (1) the increasing hydrostatic pressure hindered the passive film formation; (2) the increasing hydrostatic pressure retarded the B1 process (parallel birth and death stochastic model) and accelerated the A3 process (parallel birth stochastic model); (3) the pitting growth probability increased