论文部分内容阅读
用电化学阻抗技术研究了环氧富锌底漆、环氧云铁中间漆和氟碳面漆构成的多层复合涂层在四种不同腐蚀环境中的失效过程.涂层在四种环境中的失效速率按下列顺序降低:3.5%NaCl浸泡+紫外照射,45℃湿热环境,35℃盐雾试验,3.5%NaCl浸泡.尽管涂层在四种不同环境中失效速率差别很大,但不同环境中阻抗中频区的相角,尤其是10Hz频率的相角,与涂层的低频阻抗值变化趋势非常接近.由于中频区的相角可以快速测量,因此可以作为在工程现场定性评价涂层保护性能的参数.
Electrochemical impedance spectroscopy was used to study the failure process of multi-layer composite coatings composed of epoxy zinc-rich primer, epoxy-iron-iron intermediate coat and fluorocarbon top coat in four different corrosive environments. Of the failure rate decreased in the following order: 3.5% NaCl immersion + UV irradiation, 45 ° C hot and humid environment, 35 ° C salt spray test, 3.5% NaCl immersion Although the coating in four different environments failure rate varies widely, The phase angle of the mid-impedance mid-frequency region, especially the phase angle of 10 Hz, is very close to the trend of the low frequency impedance of the coating. Since the phase angle of the mid-frequency region can be quickly measured, it can be used as a qualitative assessment of coating protection performance The parameters.