| WANG Hua,SONG Hang.Electrochemical Synthesis and Properties of Polyaniline on Aluminum Surface[J],45(4):46-52 |
| Electrochemical Synthesis and Properties of Polyaniline on Aluminum Surface |
| Received:November 16, 2015 Revised:April 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.008 |
| KeyWord:polyaniline electrochemical synthesis potentiostatic method cyclic voltammograms aluminum corrosion |
| Author | Institution |
| WANG Hua |
School of Chemical Engineering, Dalian University of Technology, Dalian , China |
| SONG Hang |
School of Chemical Engineering, Dalian University of Technology, Dalian , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To improve the anti-corrosion performance of aluminum in medium containing chloride ion. Methods Polyaniline was electrochemically synthesized on aluminum in the solution of 1 mol/ L sulfuric acid containing 0. 4 mol/ L aniline by potentiostatic method and cyclic voltammograms. The structure and morphology of polyaniline were characterized by the infrared spectrum (IR), UV-VIS spectra and scanning electron microscope (SEM). The anticorrosion performance was tested by the polarization curves and electrochemical impedance in four kinds of corrosive medium including 0. 6 mol/ L NaCl, 0. 6 mol/ L HCl、0. 3 mol/ L H2SO4 and 0. 3 mol/ L H2SO4+0. 6 mol/ L NaCl. Results IR and UV-Vis spectra showed that polyaniline synthesized by different electrochemical methods was SO42- -doped structure and had similar absorption peak position. SEM indicated polyaniline had a structure of granular, nano-short rod. Polyaniline coatings shifted the corrosion potential to more positive values in all kinds of corrosive medium, the corrosion potentials of polyaniline prepared by potentiostatic method and cyclic voltammograms in 0. 3 mol / L H2 SO4 were positively shifted by 769 mV and 894 mV, respectively. Compared to the potentiostatic potential method, the polyaniline coating prepared by cyclic voltammetry had better anticorrosion performance, its protection efficiency was as high as 91. 69% in 0. 3 mol / L H2 SO4 + 0. 6 mol / L NaCl, and its protection efficiencies in 0. 6 mol / L HCl and in 0. 6 mol / L NaCl solution were 80. 40% and 6. 54% , respectively. Conclusion The corrosion protection effect of polyaniline for Al in the acidic solution was more obvious than in the neutral solution; the polyaniline coating on aluminum could play a good corrosion protection role in the aggressive environment of 0. 3 mol / L H2 SO4 + 0. 6 mol / L NaCl. |
| Close |
|
|
|