| ZHOU Zhi-cun,WANG Ting-ting,WU Fang,ZHANG Pei-qiang,ZHANG Jing,YU Jin.Effects of Triethanolamine and Composite of Triethanolamine/Carbamide on Zirconia Conversion Film[J],46(7):173-177 |
| Effects of Triethanolamine and Composite of Triethanolamine/Carbamide on Zirconia Conversion Film |
| Received:February 10, 2017 Revised:July 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.07.029 |
| KeyWord:zirconia conversion film triethanolamine carbamide corrosion resistance silanol silane adhesion |
| Author | Institution |
| ZHOU Zhi-cun |
School of Science,Shenyang University of Technology, Shenyang , China |
| WANG Ting-ting |
School of Science,Shenyang University of Technology, Shenyang , China |
| WU Fang |
School of Science,Shenyang University of Technology, Shenyang , China |
| ZHANG Pei-qiang |
School of Science,Shenyang University of Technology, Shenyang , China |
| ZHANG Jing |
1.School of Science,Shenyang University of Technology, Shenyang , China; 2.NFC Shenyang Metallurgical Machinery Co. Ltd, Shenyang , China |
| YU Jin |
School of Science,Shenyang University of Technology, Shenyang , China |
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| Abstract: |
| The work aims to improve corrosion resistance of zirconia conversion film on steel.With Q235 steel sheets were studied as objects of study,a zirconia conversion film was preparedon the steel surface by adding containing different concentrations of triethanolamine or composite of triethanolamine/carbamide to the zirconium solution. Electrochemical behavior of the zirconia conversion film in 5% NaCl corrosive liquidwas discussed with polarization curves and electrochemical impedance spectroscopy. Morphology of the zirconia conversion film was observed with SEM. After coating the films with different primers, properties of zirconia conversion film was assessed by performing adhesion test by scratch. Forthe zirconia conversion film prepared by adding 100mg/L triethanolamine to zirconia basic film-forming liquid in 5% NaCl corrosive liquid, the self-corrosion current was 1.66×10−5 A/dm2, passivation areawaswidest, impedance was the highest and corrosion resistance was the best. However, for the zirconia conversion film made from carbamide instead of 50%triethanolaminein 5% NaCl corrosive liquid, the self-corrosion potential and current changed slightly, the passivation area was wider while impedance arc increased obviously. For the zirconia conversion filmprepared by adding triethanolamine and composite of triethanolamine/carbamide in zirconia basic film-forming liquid treated with 2% silanol confining liquidand 5% silane confining liquid, the adhesion to low-treated surfaceepoxy primer and modified epoxy primer coating was grade 1. The corrosion resistance of Q235 steel can be enhanced by adding triethanolamine or composite of triethanolamine/carbamide to the zirconium solution. After being treatedwith 2% silanol confining liquid and 5% silaneconfining liquid, respectively,the zirconia conversion film keeps good adhesion to low pretreated surface epoxy primer andmodified epoxy primer. |
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