| CHEN Wen-bin,ZHU Qiang,LEI Yu-cheng,ZHAO Jun.Preparation of Micro-arc Oxidation Ceramic Layer on the Surface of Carbon Steel Welding-Brazing Layer[J],47(10):269-274 |
| Preparation of Micro-arc Oxidation Ceramic Layer on the Surface of Carbon Steel Welding-Brazing Layer |
| Received:February 13, 2018 Revised:October 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.036 |
| KeyWord:Q235 steel aluminum-steel welding brazing micro-arc oxidation ceramic layer density |
| Author | Institution |
| CHEN Wen-bin |
Jiangsu University, Zhenjiang , China |
| ZHU Qiang |
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 prepare a micro-arc oxidation ceramic layer with high bonding strength on the surface of carbon steel. The aluminum-steel welding-brazing method was used to obtain an aluminum layer with a high bond strength on the surface of Q235 steel. Then, an oxide ceramic layer was fabricated on the surface of the aluminum layer through micro-arc oxidation. ER4043 welding wire was added as the brazing filler metal and the intermetallic compound layer was mainly composed of [Al,Fe,Si] phase, Al8Fe2Si phase and a few Al13Fe4 phase with an average thickness of 7 μm. The bonding strength between the aluminum layer and the Q235 steel was 181 MPa. In the electrolyte of 2 g/L KOH and 4 g/L Na2SiO3?9H2O, the ceramic layer was composed of loose layer and dense layer with main components of α-Al2O3 and γ-Al2O3, and the content of γ-Al2O3 was higher. Oxygen and silicon in the electrolyte were all involved in the reaction during the micro-arc oxidation process. In the micro-arc oxidation process, the thickness of the ceramic layer increased with the increase of time. The discharge holes on the surface were "crater"-like after micro-arc oxidation process for 20 min, and the size of "crater"-like holes increased with time. At different frequencies, there were a few cracks on the surface of the ceramic layer, and the cracks were generated near the "crater"-like discharge hole. At the same time, as the frequency increased, the hole size of the ceramic layer decreased, but the thickness increased. However, when the frequency reached 600 Hz, the thickness of ceramic layer did not change obviously. The bonding strength between aluminum layer prepared by the aluminum-steel welding brazing technology and the steel substrate is much higher than that between those made by other composite surface technology, which has a certain significance to solve the problem about the easy spalling of ceramic coating on steel materials. During the micro-arc oxidation process, the thickness of the ceramic layer increases continuously and the density of ceramic layer increases with the increase of micro-arc oxidation frequency. |
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