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Citation: GAO Yan-Min, CHEN Li-Zhuang, WANG Shao-Ming. Effect of Talcum Powder Filler Coated by Stearic Acid on Diffusion Behavior of Water Through Epoxy Coatings[J]. Chinese Journal of Applied Chemistry, ;2006, 23(8): 927-929. shu

Effect of Talcum Powder Filler Coated by Stearic Acid on Diffusion Behavior of Water Through Epoxy Coatings

1.
Jiangsu Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang 212003

Corresponding author: GAO Yan-Min,
Received Date: 8 October 2005
Available Online: 21 February 2006
Fund Project: 江苏高校基金资助项目(03KJD430006) (03KJD430006)

By means of electrochemical impedance spectroscopy(EIS),the impedance variation of epoxy coatings with talcum powder filler coated by stearic acid was studied. The diffusion coefficients of water through epoxy coatings with talcum powder filler coated by stearic acid with different concentrations were calculated. The experimental results show that the stearic acid-coated talcum powder filler in the epoxy coatings has a function of decreasing water diffusion coefficient.In this epoxy coating system,the talcum powder filler coated by stearic acid has a critical coating concentration(0.5%).When the coating concentration is less than the concentration,the diffusion coefficient decreases with the increase of coating concentration,while when the coating concentration is higher than the concentration,the filler influences adhesion between the coating and substrate,as a result,stearic acid can cause the loss of corrosion protection.Meanwhile,the calculations show that without coating the filler,the diffusion coefficient of water is 3.01×10¹⁰/(cm²·s^-1). However,when coating concentration is 0.5%,a minimum diffusion coefficient 0.89×10¹⁰/(cm²·s^-1) of water could be achieved.
- epoxy resin,
- stearic acid,
- inhibitor,
- coating,
- EIS
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