钢丝连续热浸镀铝的工艺、组织及性能-材料加工工程专业论文.docxVIP

钢丝连续热浸镀铝的工艺、组织及性能 摘 要 钢丝热浸镀铝是把经过预处理的钢丝浸入熔融的铝液中，使钢丝表面镀上 一层纯铝，通过扩散反应生成的Fe—A1合金层使纯铝层与钢丝基体实现牢固的 冶金结合，从而制备铝钢复合导线。 论文研究了钢丝热浸镀铝的工艺及组织性熊，主要包括：钢丝预处理、助 镀剂的选择、镀层厚度变化动力学分析、镀层组织结构、复合导线的力学性能、 耐蚀性能和导电性等几方面的内容。 通过试验选择了6％KF+4％NaCl水溶液作为钢丝镀铝的助镀剂，分别用10 和20钢丝(含C分别为0．14％和0．21％)进行了V形引镀工艺的研究，得出较理 想的镀铝工艺参数为：铝液温度680—710℃，钢丝运行线速度20m／min。还 得出纯铝层厚度变化、合金层厚度变化与钢丝线速度之间的动力学规律。对镀 层的组织结构、镀铝层形成机理及电性能和力学性能进行了研究，得出复合导 线的导电性能、耐腐蚀性能均好于镀锌钢丝和裸钢丝。 钢丝热浸镀铝的研究为铝钢复合导线迸一步的开发应用提供了必要的试验 数据，同时对开发新的复合材料制各工艺具有指导意义。 关键词：热浸镀铝、助镀剂、电阻率、耐腐蚀性  钢丝连续热浸镀铝的工艺、组织及性能 Abstract Hot．dip Aluminizing(HDA)iS one of the most economical techniques for coating large tonnage of steel wires．In the process，the pretreated steel wire was dipped in the molten metal of aluminum and passed thtough the coating bath．Then the wire was coated with aluminurn．nle intermetallic compounds of aluminum and iron formed at the interface layer between the coating and the substrate．，j，g thin diffusion layer gave a s臼ong metallurgical bond between the coating and the steel wire． In this thesis，preliminary a=ctenfion has been paid on the surface pretreatment of the steel wire and the optimum selection of promotion flux．The kinetics of the tiffckness change during HDA，the formation mechanism of tb．e coating，its microstructure and properties had been investigated． A kind of flux of 6％KF+4％NaCl solution was used．Hot dipped 0．14％C steel wire and 0，2}％C steel wire were studied through V-shaped procedure．The results shOW that the best parameter of hot dip aluminizing are the temperatures of the bath between 680—710℃and the travelling speed20trdmin ofsteel wire．It alSO show that the thickness of aluminum layer and the diffusion layer are changed with the speed of steel wire．The corrosion resistance Was investigated by compared the aluminized wire with the galvanized wire and the steel wire．The electrical and corrosion resistance ofaluminized wire are better． The research of the hot—dip aluminizing provides the necessary information for the fLwther development of A