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| The anticorrosive performance of two inhibitive pigments, zinc chromate and zinc phosphate, was compared using electrochemical mpedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET) in pigment extracts in 0.1 M NaCl. It was observed hat zinc was protected from corrosion in both extracts. In tests using hot dip galvanised steel painted with an epoxy primer incorporating the pigments, the SVET detected the anodic and cathodic distribution along the scribes, although no significant differences were observed among he various primers. On the contrary, EIS was able to distinguish processes occurring on the metal surface exposed by the scribe in different samples. For primers with anticorrosive pigment, a time constant at high frequencies was attributed to a layer of protective nature, probably formed by metal ions from the substrate and inhibitive ions leached from the anticorrosive pigments. |
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幻雪之恋: 金币+30, 翻译EPI+1, ★★★很有帮助 2014-04-29 09:03:45
幻雪之恋: 金币+30, 翻译EPI+1, ★★★很有帮助 2014-04-29 09:03:45
| 通过电化学阻抗谱（EIS）和扫描振动参比电极（SVET）技术比较研究了两种防锈涂料铬酸锌和磷酸锌在颜料提取物的0.1M NaCl溶液中抗腐蚀性能。研究发现Zn在两种提取液中均不发生腐蚀。对涂有环氧树脂底漆的热镀锌钢进行测试，SVET检测了刮痕处的阳极和阴极分布，并没有观察到不同的底漆间存在明显的差异。相反，EIS能够区分不同样品中划痕处暴露的金属表面的反应过程。对于涂有底漆的抗腐蚀颜料，在高频处的时间常数可归因于基底上金属离子和抗腐蚀颜料中过滤出来的抑制性离子形成的保护层。 |
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