热轧退火钛带酸洗工艺研究

摘要

Pickling is one of the important processes before titanium strip coil cold rolling .Pickling conditions for hot rolled annealed titanium strip coil were first studied in laboratory , including the concentration of acid , pickling time , pickling temperature and so on .The results show that the rate of weight loss will decrease while the pickling time will increase with the decreasing of the ratio of HF∶HNO3 .The best condition for pickling is that the concentration of HF acid is 3%and HNO3 acid is 27%, the pickling temperature is 40 ℃and the pickling time is 240 s.And under this treat condition, the rate of weight loss will only be 1.12%.Besides, the pickling temperature of 25 ℃and 55 ℃are both not benefit for the pickling of titanium strip coil .The industrialized experiment results show that the pickling effect is obvious based on the best treat condition , and the surface oxide layer can be removed thoroughly .%酸洗是钛带冷轧前的重要工序之一，首先从酸的浓度及配比、酸洗时间、酸洗温度等方面对热轧退火后钛带卷的酸洗条件进行了实验室探究。结果表明，随着氢氟酸与硝酸体积比的降低，钛带的酸洗失重率逐渐降低，而酸洗所需时间逐渐增加。综合考虑酸洗的效果、速度及成本认为最佳酸洗工艺条件是：酸洗温度为40℃，酸洗液中氢氟酸体积分数为3％、硝酸体积分数为27％，酸洗时间为240 s时，酸洗效果最佳，此时，钛带试样失重率为1.12％。此外，研究发现，酸洗温度为25℃和55℃皆不利于钛带酸洗。之后，工业化试验表明，按照最佳的酸洗工艺条件对工业纯钛带进行酸洗，酸洗效果较好，表面氧化皮可被彻底洗尽。