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http://dx.doi.org/10.7464/ksct.2013.19.3.257

Preparation and Performance Evaluation of Zinc Phosphate-Coated Mica Anticorrrosive Pigment  

Lee, Yu Jin (Department of Chemical Engineering, Pukyong National University)
Park, Seong Soo (Department of Chemical Engineering, Pukyong National University)
Hong, Seong Soo (Department of Industrial Chemistry, Pukyong National University)
Lee, Seung Ho (Eco Composite Materials Center, Korea Institute of Ceramic Engineering & Technology)
Kim, Dae Sung (Eco Composite Materials Center, Korea Institute of Ceramic Engineering & Technology)
Lee, Gun Dae (Department of Chemical Engineering, Pukyong National University)
Publication Information
Clean Technology / v.19, no.3, 2013 , pp. 257-263 More about this Journal
Abstract
The zinc phosphate-coated mica (ZP/mica) pigments were prepared using phosphoric acid, zinc nitrate and mica as starting materials, and used as anticorrosive pigments. The scanning electron microscopy (SEM) and x-ray diffraction (XRD) techniques were used to observe the morphology and crystal structure of prepared pigments. The prepared pigments were incorporated into an epoxy binder to prepare coating and the corrosion inhibition performance of the pigments was evaluated using electrochemical impedance spectroscopy (EIS). It was found that the anticorrosive performance of the ZP/mica pigment prepared at $70^{\circ}C$ was the better than that prepared at $20^{\circ}C$. The formation of ZnO, in addition to $Zn_3(PO_4)_2{\cdot}2H_2O$, was observed on ZP/mica pigment prepared at $70^{\circ}C$. The excellent anticorrosive performance of ZP/mica pigment could be ascribed to the synergistic effect with electrochemical anticorrosive mechanism from zinc compounds on mica and barrier anticorrosive mechanism from lamellar mica.
Keywords
Zinc phosphate; Mica; Anticorrosive pigment; Electrochemical mechanism; Barrier mechanism;
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