热镀锌汽车钢表面气刀飞溅缺陷分析与控制  

Analysis on Defects on Surface of Hot-dip Galvanized Automobile Steels Caused by Air Knife Splashing and Countermeasures

作　　者：孙旭东 郭强 彭彪 SUN Xudong;GUO Qiang;PENG Biao(Ansteel and Thyssenkrupp Joint Venture Company,Dalian 116650,Liaoning,China)

机构地区：[1]鞍钢蒂森克虏伯汽车钢有限公司,辽宁大连116650

出　　处：《鞍钢技术》2024年第5期26-32,共7页Angang Technology

摘　　要：针对热镀锌汽车板表面亮点和白点缺陷,利用扫描电镜(SEM)对其组织成分和微观形貌进行分析。分析结果表明,上述缺陷是锌颗粒和锌皮子缺陷,均为气刀飞溅导致。采取稳定控制生产线速度,优化气刀压力、高度及角度等工艺参数,严格管理气刀的维护与检查等措施后,气刀飞溅引起的带钢锌颗粒缺陷降级率由0.23%降至0.11%,锌皮子缺陷降级率由0.11%降至0.06%,满足了用户对汽车钢板表面质量的要求。Aiming at the bright spot defects and white spot defects on the surface of hot-dip galvanized automobile steel sheets,their microstructures and structural constituents were analyzed by scanning electron microscopy(SEM).The analytical results showed that the above defects belonged to zinc particle defects and zinc skin defects,which were caused by air knife splashing.Therefore,after taking such countermeasures as stably controlling the production line speed,optimizing the process parameters including air knife pressures,air knife heights and air knife angles,and strictly managing the maintenance and inspection for the air knife,the downgrade rate of zinc particle defects caused by air knife splashing was decreased to 0.11%from 0.23%,the downgrade rate of zinc skin defects was reduced to 0.06%from 0.11%,which met the requirements on the surface quality of automobile steel sheets asked by users.

关 键 词：热镀锌 汽车钢 气刀飞溅 气刀压力 气刀角度 气刀高度 

分 类 号：TG173[金属学及工艺—金属表面处理]