| HAN Xiao-xia,WANG Ying-ying,LIU Xiang-ming,WANG Zhen-yuan,,LI Yi-ran,WANG Hu,TANG Jun-lei.Corrosion Protection of TiO2/PVB-PANI/PVB Hybrid Coating on Stainless Steel[J],47(12):238-245 |
| Corrosion Protection of TiO2/PVB-PANI/PVB Hybrid Coating on Stainless Steel |
| Received:July 14, 2018 Revised:December 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.032 |
| KeyWord:stainless steel polyaniline polyvinyl butyral nano-titanium dioxide corrosion-resistant coating photocathodic protection photoelectric response |
| Author | Institution |
| HAN Xiao-xia |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| WANG Ying-ying |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| LIU Xiang-ming |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| WANG Zhen-yuan, |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| LI Yi-ran |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| WANG Hu |
b.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| TANG Jun-lei |
a.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| The work aims to prepare a new type of green TiO2/PVB-PANI/PVB hybrid coating to study the anti-corrosion mechanism of hybrid coating on stainless steel in NaCl solution. Polyaniline (PANI) was synthesized by in-situ chemical oxidation. PVB was used as binder and methanol was used as solvent. The TiO2/PVB-PANI/PVB hybrid coating was prepared on the surface of stainless steel by dip-coating method and knife coating method. Functional groups, light absorption properties, structure and microstructures were analyzed by Fourier transform infrared (FT-IR), UV-vis diffuser reflectance (UV-Vis DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The anti-corrosion mechanism and corrosion resistance of TiO2/PVB-PANI/PVB hybrid coating and PANI/PVB coating were compared and analyzed by electrochemical method and scratch immersion test. The photoresponse current of TiO2/PVB-PANI/PVB hybrid coating was 250 nA/cm2, and its photovoltage decreases by 0.12 V compared with stainless steel. From the electrochemical tests, compared with stainless steel, the self-corrosion potential of the TiO2/PVB-PANI/PVB hybrid coating rose, the self-corrosion current density decreased and the radius of the capacitive anti-arc increased. The electrochemical reaction rate at the interface obviously increased during illumination. The scratch immersion test showed that the corrosion resistance of the TiO2/PVB-PANI/PVB hybrid coating was better than that of the PANI/PVB coating in the presence or absence of light. The contrast between the two coatings in the light was more obvious. TiO2/PVB-PANI/PVB hybrid coating provided excellent corrosion protection for stainless steel by virtue of physical shielding, anti-corrosion of PANI and photocathodic protection. |
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