乘用汽车车身铝合金薄板生产工艺

Production technology of aluminum sheet used for passenger-automobile body

对乘人汽车车身铝合金薄板(ABS,Auto Body Sheet)生产工艺作了全面的阐述,特别是对热处理工艺中的双级时效(预时效与喷漆后的烘烤时效)作了重点介绍,这是6×××系合金ABS特有的时效处理;化学转化膜处理也是宜在铝加工厂进行的ABS带材生产中特有的工艺之一。ABS的预时效(pre-aging)温度为80℃,时间为15 min左右;第二阶段时效即烘烤温度为170℃,保温30 min左右,具体时间决定于漆膜固化所需的时间。无铬的锆/钛盐类转化膜处理也是ABS生产的关键工艺之一。中国在2013年前还不具备批量生产ABS的条件,必须建设这类产品生产项目,为汽车的轻量化与国家节能减排政策的推广提供充分的物质基础。

The production technology of auto-body sheet （ABS） has been discussed comprehensively. The double-step aging process （pre-aging and baking aging behind spry painting） have been introduced with emphasis ,which is the only special technology used for ABS of 6xxx aluminium alloy. The chemical conversion of coating treatment is one of the special technology as well which is suitably used in the aluminium fabrication plant. The pre-aging of the auto body sheet is treated at 80℃ with 15 min; the second ageing step is baked at 170 ~C with about 30 min holding. The holding time is depended on the solidifying time of the blackened coating. The non-chromium conversion of zirconium /titanium salt is a key technology of ABS process. China has no condition to produce the ABS yet before 2013. So China has to build up suitable production line for producing ABS and to afford material base for lightening the automobiles, saving energy and cutting carbon emission, in order to make a contribution for increasing domestic demands and expanding exports.