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采用动电位极化、电化学阻抗和电容测量等方法研究了P110钢在0.5 mol/L Na2CO3+1 mol/L NaHCO3缓冲溶液中生成的钝化膜的电化学性能。结果表明,P110钢在-0.2 V~0.8 V发生了明显的钝化现象;随着成膜电位的正移,钝化膜更加致密和稳定,耐蚀性更好;P110钢在该缓冲溶液中生成的钝化膜是n型半导体,随着成膜电位的正移,施主密度更低,对基体的保护作用增强。
The electrochemical performance of the passivation film of P110 steel in 0.5 mol / L Na2CO3 + 1 mol / L NaHCO3 buffer solution was investigated by potentiodynamic polarization, electrochemical impedance and capacitance measurement. The results show that the passivation of P110 steel is obvious at -0.2 V ~ 0.8 V; the passivation film is more compact and stable with better corrosion resistance as the film formation potential is shifted; and P110 steel is in the buffer solution The resulting passivation film is an n-type semiconductor. With the positive shift of the film formation potential, the donor density is lower and the protective effect on the substrate is enhanced.