宋木清,王少峰,袁玮,何龙,黄峰.不同除鳞工艺对热轧带钢热镀锌质量的影响[J].表面技术,2024,53(14):116-127.
SONG Muqing,WANG Shaofeng,YUAN Wei,HE Long,HUANG Feng.Effect of Different Descaling Processes on Hot-dip Galvanizing Quality of Hot Rolled Strip[J].Surface Technology,2024,53(14):116-127 |
| 不同除鳞工艺对热轧带钢热镀锌质量的影响 |
| Effect of Different Descaling Processes on Hot-dip Galvanizing Quality of Hot Rolled Strip |
| 投稿时间：2024-01-28 修订日期：2024-01-31 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.14.010 |
| 中文关键词: 除鳞工艺 EPS技术 热轧带钢 热镀锌 |
| 英文关键词:descaling process Eco-Pickled Surface technology hot rolled strip hot-dip galvanizing |
| 基金项目:国家自然科学基金(U21A20113) |
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| Author | Institution |
| SONG Muqing | Hangzhou Taien Intelligent Equipment Tech Co., Ltd., Hangzhou 311400, China |
| WANG Shaofeng | Hangzhou Taien Intelligent Equipment Tech Co., Ltd., Hangzhou 311400, China |
| YUAN Wei | State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
| HE Long | Hangzhou Taien Intelligent Equipment Tech Co., Ltd., Hangzhou 311400, China |
| HUANG Feng | State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
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| 中文摘要: |
| 目的 研究酸洗、湿法抛丸技术(Eco-Pickled Surface，EPS)、EPS+纤维刷工艺(EPS+plus)和干抛丸4种不同除鳞工艺对Q235B热轧带钢热镀锌质量的影响机理和规律，并将EPS和EPS+plus工艺处理后的热轧带钢在带钢热镀锌生产线上试制，实现大规模生产。方法 采用粗糙度轮廓仪测量4种表面除鳞处理后的Q235B钢板表面粗糙度，利用扫描电镜分析表面形貌及氧化皮残留情况。通过实验室热镀锌实验，观察镀锌层表面形貌，利用场发射电子探针(EF-EPMA)分析锌层截面形貌及成分面分布;通过折弯实验评定锌层结合力;去除表面镀锌层，计算锌消耗量，观察脱锌后表面抑制层形貌，并用能谱对其进行成分分析。将Q235B热轧带钢在鞍钢金固EPS生产线上进行EPS和EPS+plus处理后，分别在热镀锌生产线进行镀锌和镀锌铝镁工业试制，并对生产试制卷进行力学、折弯及杯突检测，以评定质量。结果 酸洗、EPS、EPS+plus和干抛丸4种工艺处理后钢板表面粗糙度分别为1.444 2、3.330 5、2.396 4、4.338 8 μm。EPS处理试样表面未发现有氧化铁皮的残留，EPS+plus处理试样仅有极少量的氧化铁皮残留。EPS和EPS+plus工艺处理钢板热镀锌试样基体与锌层之间均能形成连续较致密的抑制层，锌层结合力评为1级，且锌消耗量较小，分别为148.3、123.5 g/m2。结论 EPS和EPS+plus工艺处理后钢板镀锌质量优于酸洗和干抛丸工艺，EPS和EPS+plus工艺处理后在热镀锌生产线上试制的实验卷满足镀锌质量要求。 |
| 英文摘要: |
| The oxide scale on the surface of the hot rolled strip must be removed before hot-dip galvanizing, and this descaling process can also affect the surface quality of the galvanized plate. Acid pickling is currently the most widely used descaling process, but the acid mist discharge during this process seriously pollutes the environment. In the process of seeking a new environmentally friendly descaling technology, Eco-Pickled Surface (EPS) has emerged, but its application in continuous hot rolled strip plating production has certain difficulties. The work aims to study the effect and mechanism of four different descaling processes, namely acid pickling, EPS, EPS+plus and dry shot blasting, on the surface and hot-dip galvanizing quality of Q235B hot rolled strip. The surface roughness of Q235B steel plate after descaling process was measured by roughness profilometer and the surface morphology and oxide scale residue were analyzed by scanning electron microscopy. Hot-dip galvanizing experiment was carried out, the zinc consumption was calculated, and the zinc layer adhesion was evaluated by bending experiment. Scanning electron microscopy was used to observe the surface morphology of the zinc layer, and the surface morphology and composition analysis of the inhibition layer between the zinc layer and the substrate interface were observed and analyzed. Electron probe microanalyzer was used to analyze the cross-sectional morphology and composition distribution of the zinc layer. Also, EPS and EPS+plus treatment were carried out on the EPS production line of Angang Steel Group Limited built by Jingu Co., Ltd. and the galvanized layer quality of the product was evaluated by mechanics, bending and cupping tests. The results showed that the surface roughness of the steel plate after pickling, EPS, EPS+plus and dry shot blasting was 1.444 2, 3.330 5, 2.396 4 and 4.338 8 μm respectively. There was obvious oxide scale residue on the surface of dry shot blasting treated sample. No residual oxide scale was found on the surface of acid pickling treated sample and EPS treated sample, but there were obvious acid-washed corrosion grain boundaries on the surface of the acid pickling treated sample. Although there was only a very small amount of residual oxide scale found on the surface of EPS+plus treated sample, the adverse effect on the galvanizing quality can be ignored. The zinc layer adhesion of the acid pickling treated sample was rated as grade 1, but the flatness of the interface between the zinc layer and the substrate was poor, and the zinc consumption was also more, which was 176.2 g/m2. The quality of the zinc layer of the dry shot blasting treated sample was poor, with obvious cracks and dezincification, which was rated as grade 3. During the hot-dip galvanizing process of the steel plates treated by EPS and EPS+plus process, a continuous and denser inhibition layer was formed between the substrate and the zinc layer. The adhesion of zinc layer was rated as grade 1, and the zinc consumption was less, which was 148.3 and 123.5 g/m2, respectively. The quality of galvanized steel plate treated by EPS and EPS+plus process is better than that of pickling and dry shot blasting process treated samples, and the EPS and EPS+plus process can fully meet the galvanizing quality requirements of hot rolled strip in actual production. |
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