通过测量开路电位?时间曲线,研究了单宁酸、钼酸铵、氟硼酸铵和氟锆酸的含量以及pH对1050铝合金化学转化的影响.得到最佳工艺条件为:单宁酸0.6 g/L,钼酸铵3.0 g/L,氟硼酸铵4.0 g/L,氟锆酸4 mL/L,pH 4,室温,时间15 min.成膜过程分为表面活化、成膜反应和膜层沉积3个阶段.在最佳工艺条件下所得膜层的厚度为2.5 μm,附着力为0级,抗冲击能力为50 kg·cm,耐中性盐雾试验时间为180 h.%The effects of the contents of tannic acid, ammonium molybdate, ammonium fluoroborate, and fluorozirconic acid, as well as pH on chemical conversion for 1050 aluminum alloy were studied by measuring the open circuit potential vs. time curves. The optimized process conditions are: tannic acid 0.6 g/L, ammonium molybdate 3.0 g/L, ammonium fluoroborate 4.0 g/L, fluorozirconic acid 4 mL/L, pH 4, room temperature, and treatment time 15 min. There are three stages for the film forming process, i.e. surface activation, film forming reaction, and film deposition. The conversion film obtained under the optimal conditions features a thickness of 2.5 μm, an adhesion strength of 0 grade, a shock resistance up to 50 kg·cm, and a neutral salt spray corrosion resistance up to 180 h.
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