Die-casting aluminum chromium-free phosphating agent and preparation method thereof

The invention discloses a die-casting aluminum chromium-free phosphating agent. The die-casting aluminum chromium-free phosphating agent comprises, by weight, 100 parts of deionized water, 2-20 partsof phosphoric acid, 1-10 parts of zinc nitrate, 0.5-5 parts of zinc oxide, 1-10 parts of manganous dihydrogen phosphate, 0.1-1 part of sodium gluconate and 0.1-1 part of urotropine. The prepared die-casting aluminum chromium-free phosphating agent can be used for low-temperature phosphating, is high in phosphating efficiency and friendly to environment and has good market prospects. 本发明公开了种压铸铝无铬磷化剂，按重量份计，其制备原料包括：去离子水100份、磷酸2-20份、硝酸锌1-10份、氧化锌0.5-5份、马日夫盐1-10份、葡萄糖酸钠0.1-1份及乌洛托品0.1-1份。本发明所得压铸铝无铬磷化剂可低温磷化、磷化效率高且绿色环保，具有很好的市场前景。