Effect of hydrostatic pressure on the nature of passive film of pure nickel

Abstract

The effect of hydrostatic pressure on the nature of passive film of nickel in 3.5% NaCl solution was investigated by means of polarization curves, electrochemical impedance spectroscopy (EIS), and Mott-Schottky measurement. The experimental results revealed that hydrostatic pressure had two opposite effects on passive film of nickel. On one hand, hydrostatic pressure improved the corrosion resistance of passive film of nickel such as the decreased acceptor density. On the other hand, the passive film became unstable and showed a higher diffusivity of acceptor density with the increasing of hydrostatic pressure, which deteriorated the corrosion resistance of passive film of nickel. The deterioration effect had greater influence on the passive film than the improvement effect, which led to the decreasing corrosion resistance of passive film with the increasing of hydrostatic pressure.

Passivity of Spring Steels with Compressive Residual Stress

“…Extensive experimental results apparently agree with this opinion [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Other researchers have reported a high corrosion rate or a low corrosion resistance for the metals or alloys with passive films with low point defect density [38][39][40][41][42], corresponding to the results drawn from this work. Another group has proposed no clear dependence of corrosion resistance on the point Previous reports about the relationship between the corrosion resistance and the point defect density fall into three categories.…”

Taking account of hydrostatic pressure in the modeling of corrosion of thick spherical shells

“…It should be noted, that higher hydrostatic pressure may lead to an increase in a corrosion pitting growth probability [13]. Some results concerning the stress distribution near corrosion pits in a spherical shell are given in [14].…”

Comment on “New understanding of the effect of hydrostatic pressure on the corrosion of Ni–Cr–Mo–V high strength steel”

“…The effect of hydrostatic pressure on the corrosion behaviour of alloys can be quite different and can change the properties of passive film, the rate of pit generation and pit growth, etc. [2][3][4][5][6].…”