镀铝钢板以其优异的耐蚀性、良好的耐热性(耐高温氧化性)和对光、热的反射性,被广泛应用于汽车、家电和新能源等各个领域。钢板连续热镀铝的生产工艺流程与传统的连续热镀锌基本一样。但由于铝的熔点高、可镀性差以及对钢板和浸入件腐蚀性强等特点,使得钢板连续热镀铝的连续稳定生产面临诸多挑战。还原退火炉气氛控制、镀锅管理技术、镀层控制以及镀后冷却控制技术等是钢板连续热镀铝的关键生产工艺技术,对上述各关键工艺点的技术难点和对策进行详细分析。
Hot-dip aluminized steel sheets are widely used for automotives,appliances and new-energy fields due to its excellent corrosion resistance,high temperature heat resistance,and light and heat reflectivity.The production flow of continuous hot-dip aluminized steel sheet is similar with CGL,but its continuous and stable industrialized production face challenges from the higher bath temperature,poor coating active and strong corrosivity on steel plate and immersion pieces of Al melt.Furnace atmosphere,Aluminum pool management,coating control and cooling af-ter coating are the key techniques for the production of hot dip aluminized steel sheet.Technical difficulties and countermeasures of those key techniques were discussed in detail.
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