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基于统计学方法和随机理论,利用动电位极化曲线和恒电位测试技术研究静水压力对Fe-20Cr合金点蚀行为的影响。随着静水压力的增加,Fe-20Cr合金的击破电位降低,维钝电流密度减小,耐蚀性能变差。静水压力对Fe-20Cr合金点蚀产生和点蚀生长的研究表明:高的静水压力下,亚稳态点蚀发生的频率加快且向稳态点蚀发展的倾向增大,从而导致点蚀的产生速度加快,点蚀的孕育期缩短,但点蚀的产生机制并没有发生改变;静水压力的增加增大了点蚀的生长概率,高压下产生的点蚀更容易成长为大的腐蚀坑。
Based on the statistical method and the stochastic theory, the influence of hydrostatic pressure on the pitting corrosion behavior of Fe-20Cr alloy was studied by potentiodynamic polarization curve and potentiostatic test. With the increase of hydrostatic pressure, the rupture potential of Fe-20Cr alloy decreases, the blunted current density decreases, and the corrosion resistance deteriorates. The hydrostatic pressure on the pitting corrosion and pitting growth of Fe-20Cr alloy shows that under high hydrostatic pressure, the frequency of metastable pitting increases and the propensity to steady-state pitting corrosion increases, resulting in pitting corrosion The production rate of pitting corrosion is shortened, but the mechanism of pitting corrosion does not change. The increase of hydrostatic pressure increases the growth probability of pitting corrosion. The pitting corrosion caused by high pressure is more likely to grow into large corrosion pits.