| ZHU Qiang,CHEN Wen-bin,LEI Yu-cheng,ZHAO Jun.Effect of Current Density on Liquid Pb-Bi Corrosion Resistance of Carbon Steel Micro-arc Oxidation Layer[J],48(2):193-199 |
| Effect of Current Density on Liquid Pb-Bi Corrosion Resistance of Carbon Steel Micro-arc Oxidation Layer |
| Received:July 21, 2018 Revised:February 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.02.028 |
| KeyWord:fusion brazing micro-arc oxidation ceramic layer current density liquid Pb-Bi corrosion |
| Author | Institution |
| ZHU Qiang |
Jiangsu University, Zhenjiang , China |
| CHEN Wen-bin |
Jiangsu University, Zhenjiang , China |
| LEI Yu-cheng |
Jiangsu University, Zhenjiang , China |
| ZHAO Jun |
Jiangsu University, Zhenjiang , China |
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| Abstract: |
| The work aims to improve the corrosion resistance of carbon steel in liquid Pb-Bi. The 6061 aluminum alloy and Q235 steel were lap welded by fusion brazing method. After welding, micro-arc oxidation technology was used to prepare mi-cro-arc oxidation ceramic coating on the welded joint. Then the micro-arc oxidation samples were put into 350 ℃ liquid Pb-Bi for 300 h static corrosion test. The tungsten argon arc welding machine was used, and the ER4043 welding wire was selected as the brazing material. By adjusting the welding parameters, the bonding strength of the aluminum layer and the Q235 steel reached 182 MPa and the intermetallic compound thickness was 7.3 μm under the parameters of welding current of 85 A and welding speed of 140 mm/min. Micro-arc oxidation experiments were carried out in 2 g/L KOH and 4 g/L Na2SiO3?9H2O electrolytes. The diameter and number of discharge holes increased with the increase of current density. By comparison, it was found that the thickness of the oxide coating formed at 10 A/dm2 was suitable and the compactness was good. The ceramic coating was composed of γ-Al2O3 and α-Al2O3. After static corrosion, the surface of Q235 carbon steel base material was obviously corroded, while Q235 steel sample after micro-arc oxidation had better corrosion resistance. The corrosion resistance of oxide coating obtained under 10 A/dm2 current density was the best. The micro-arc oxidation ceramic coating can significantly improve the corrosion resistance of the material in high temperature liquid Pb-Bi alloy, and the compactness and thickness of the coating will affect the protective effect on the material. |
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