含Nb和不含Nb低合金钢在模拟500m深海环境下充氢前后的电化学测试结果:(a)极化曲线;(b)Nyquist图;(c)Bode图。
Electrochemical test results of the Nb-bearing and Nb-free HSLA steels in simulated 500m deep-sea environment before and after hydrogen charging:(a) polarization curves;(b) Nyquist plot and (c) Bode plot.