陈文彬,朱强,雷玉成,赵军.碳钢熔-钎焊层表面微弧氧化陶瓷层的制备[J].表面技术,2018,47(10):269-274.
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].Surface Technology,2018,47(10):269-274 |
| 碳钢熔-钎焊层表面微弧氧化陶瓷层的制备 |
| Preparation of Micro-arc Oxidation Ceramic Layer on the Surface of Carbon Steel Welding-Brazing Layer |
| 投稿时间：2018-02-13 修订日期：2018-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.036 |
| 中文关键词: Q235钢 铝-钢熔钎焊 微弧氧化 陶瓷层 致密性 |
| 英文关键词:Q235 steel aluminum-steel welding brazing micro-arc oxidation ceramic layer density |
| 基金项目:国家自然科学基金（51505197） |
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| 中文摘要: |
| 目的 在碳钢表面制备结合强度较高的微弧氧化陶瓷层。方法 采用铝-钢熔钎焊技术，在Q235钢表面获得具有较高结合强度的铝层，再通过微弧氧化在铝层表面生成氧化物陶瓷层。结果 通过添加ER4043焊丝作为钎料，金属间化合物层主要由[Al,Fe,Si]相、Al8Fe2Si相和少量的Al13Fe4相组成，平均厚度为7 μm，铝层与Q235钢的结合强度达到181 MPa。在2 g/L KOH+4g/L Na2SiO3?9H2O电解液中，陶瓷层由疏松层和致密层组成，主要成分为α-Al2O3和γ-Al2O3，且γ-Al2O3相含量较高，微弧氧化过程中电解液中的氧、硅元素都参与了反应。微弧氧化过程中，陶瓷层厚度随着时间的增加而增加，20 min后，试样表面放电孔洞呈“火山口”状，孔洞孔径随着时间的增加而增加。不同频率下，陶瓷层表面均存在少量裂纹，并且裂纹都产生在“火山口”状放电孔洞附近，同时随着频率的增加，陶瓷层表面孔洞孔径减小，陶瓷层厚度增加，但当频率到达600 Hz后，陶瓷层厚度变化不再明显。结论 采用铝-钢熔钎焊技术，铝层与钢基体结合强度远高于其他复合技术中铝层和钢基体的结合强度，对于解决钢铁材料表面微弧氧化陶瓷层容易剥落的问题具有一定的意义。微弧氧化过程中，陶瓷层厚度不断增加，提高微弧氧化频率，陶瓷层致密性提高。 |
| 英文摘要: |
| 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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