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采用动电位极化测定方法,在测得钢筋的阴极极化曲线之后,通过对其进行一阶微分分析,确定了钢筋的临界析氢电位及相应的析氢电流密度,之后采用稳态测量法获得钢筋析氢稳态临界电流密度。结果表明,动电位极化曲线能够记录阴极电化学反应的变化过程,一阶微分曲线出现突变点之前,阴极反应以耗氧反应控制为主,突变点之后以析氢反应控制为主;并可以测定钢筋混凝土中钢筋析氢稳态临界电流密度,从而判断氢脆发生的可能性。采用该方法测得钢筋混凝土试件的析氢稳态临界电流密度约为0.355 A/m2。
Using the method of potentiodynamic polarization, after the cathodic polarization curve of the steel was measured, the critical hydrogen evolution potential of the steel and the corresponding hydrogen evolution current density were determined by the first-order differential analysis. Then, the steady state measurement method was used to obtain the reinforcement Hydrogen Steady State Critical Current Density. The results show that the kinetic potentiodynamic polarization curve can record the change process of cathodic electrochemical reaction. Before the first derivative curve appears, the cathodic reaction takes the control of oxygen consumption as the main reaction and the hydrogen evolution reaction as the main control point after the mutation point. Reinforced concrete reinforced concrete steady-state critical current density, in order to determine the possibility of hydrogen embrittlement. Using this method, the steady-state critical current density of hydrogen evolution test is about 0.355 A / m2.