【摘要】 通过电化学阻抗技术研究了环氧防锈底漆/环氧云铁中间漆/丙烯酸聚氨酯面漆(P1)和环氧防锈底漆/氯化橡胶面漆(P2)两种复合涂层体系在60℃、3.5%Na Cl溶液中恒温浸泡失效过程,得到不同浸泡时期的电化学阻抗谱,分析了电化学阻抗谱中Bode图、涂层电阻、高频电容及特征频率的变化特征。结果表明:在浸泡初期,复合涂层体系低频阻抗值和涂层电阻下降较快,而后下降速率减缓,浸泡中期出现小幅度波动现象;高频电容和特征频率前期增大缓慢,后期增大速率加快,浸泡中期出现小幅度波动。更多还原

【Abstract】 The failure process of two composite coatings: epoxy-antirust primer/ epoxy-MIO(micaceous iron oxide)/acrylic polyurethane(P1) and epoxy- antirust primer/ chlorinated rubber(P2) in3.5%(mass fraction) Na Cl solution at 60 ℃ was investigated by electrochemical impedance spectroscopy. The variation of EIS Bode plot, electrical resistance, high-frequency capacitors and characteristic frequency of the coatings was monitored and analyzed. Results showed that: in the early immersion period, low-frequency impedance and coating resistance decreased rapidly, but they declined slowly in the later immersion period and fluctuated in a small range in the mid-term. In addition, high-frequency capacitance and characteristic frequency increased slowly in the early immersion period and increased rapidly in the later immersion period, in the mid-term, they also fluctuated in a small range.更多还原