Evaluation of protective performance of organic coatings by EIS parameters at high frequency zone

CAO Jingyi; XIONG Jinping; LI Shuibing; ZUO Yu

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Evaluation of protective performance of organic coatings by EIS parameters at high frequency zone

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- Evaluation of protective performance of organic coatings by EIS parameters at high frequency zone
- CIESC Journal Issue 11, Pages: 2851-2856(2008)
- 作者机构：
  
  1. 北京化工大学材料科学与工程学院
  2. 海军涂料分析检测中心
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 November 2008，
  
  Published：05 November 2008
- 稿件说明：
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CAO Jingyi, XIONG Jinping, LI Shuibing, et al. Evaluation of protective performance of organic coatings by EIS parameters at high frequency zone[J]. CIESC Journal, 2008, (11): 2851-2856.
DOI：

CAO Jingyi, XIONG Jinping, LI Shuibing, et al. Evaluation of protective performance of organic coatings by EIS parameters at high frequency zone[J]. CIESC Journal, 2008, (11): 2851-2856. DOI：

摘要

利用10 kHz下的相位角、10 kHz下的相对介电常数和对应于45°相位角的特征频率这3种EIS高频区的参数对两种环氧涂层体系在盐水浸泡+紫外照射的腐蚀条件下的失效过程进行了表征，并与涂层阻抗值进行了对比。测量结果表明，上述3种高频区参数的结果一致，都能够反映涂层性能的变化及相对优劣。当频率10 kHz处的相位角下降到40°，相对介电常数增大到40，或特征频率接近10 kHz时，所研究的两种环氧涂层体系的阻抗值都对应降低到106 Ω8226;cm2左右，涂层保护性能接近失效。由于这几种EIS高频区参数能够很快测得，因此可以利用这些参数快速评价该涂层的保护性能与失效程度。

Abstract

The failure processes of two epoxy coatings exposed in 3.5% NaCl solution and violet light were studied by electrochemical impedance spectrum (EIS) technology.The work was focused on the variations of phase angle at 10 kHz

relative dielectric constant and breakpoint frequency with the decline of coating performance.The results showed that the three parameters from high frequency range of EIS gave similar results and might reflect the variation of coating performance.When the phase angle at 10 kHz decreased to 40°

relative dielectric constant increased to 40

or the breakpoint frequency approached about 10 kHz

the coating resistances of the two epoxy coatings studied decreased to about 106Ω8226;cm2

and the coating performance was very low.Therefore

the parameters may be used as quick methods to evaluate the protective performance of the coatings.

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