| CHEN Yu,PAN Zheng-kai,CHEN Jun.Waterborne Polyaniline/Sepiolite/Acrylic Emulsion Composite Anticorrosive Coating[J],46(7):26-31 |
| Waterborne Polyaniline/Sepiolite/Acrylic Emulsion Composite Anticorrosive Coating |
| Received:March 20, 2017 Revised:July 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.07.005 |
| KeyWord:polyaniline sepiolite acrylic emulsion anti-corrosion coating |
| Author | Institution |
| CHEN Yu |
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan , China |
| PAN Zheng-kai |
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan , China |
| CHEN Jun |
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan , China |
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| Abstract: |
| The work aims to study anti-corrosion effects of waterborne polyaniline/sepiolite/acrylic emulsion composite coatings on tinplate in sodium chloride medium. Waterborne polyaniline/sepiolite/acrylic emulsion composite anti-corrosive coating was prepared by blending polyaniline/sepiolite composite synthesized in the method of in-situ chemical oxidization polymerization with acrylic emulsion as film-forming material. Structure and morphology of the polyaniline/sepiolite composite were characterized using scanning electron microscopy and EDX. Effects of sepiolite/aniline feed ratio, polyaniline/sepiolite composite consumption and phosphoric acid concentration on corrosion resistance of composite coating were studied using electrochemical impedance-spectra, Tafel curve and copper sulfate dripping test. SEM indicated that polyaniline/sepiolite composite had fibrous structure. Electrochemical test and copper sulfate dripping test showed that polyaniline/sepiolite/acrylic emulsion composite coating exhibited the best anticorrosive performance. Provided with sepiolite/aniline feed ratio of 6:10, polyaniline/sepiolite composite consumption of 0.2% and phosphoric acid concentration of 0.1 mol/L, the corrosion current was 1.013106 A/cm2, corrosion potential was 0.385 V and polarization resistance was 14 350.8 Ω. Polyaniline/sepiolite/acrylic emulsion composite coating has the best anti-corrosion effect on tinplate provided with sepiolite/aniline feed ratio of 6:10, polyaniline/ sepiolite composite consumption of 0.2% and phosphoric acid concentration of 0.1 mol/L. |
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