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通过在45 g/L的硫酸溶液中添加有机酸添加剂及快速成膜缓冲剂,以15~25 V的梯度电压方式对LY12CZ铝合金进行阳极氧化处理,获得一种代替铬酸阳极氧化、硼酸-硫酸阳极氧化工艺的铝合金新型环保快速阳极氧化工艺.对获得的氧化膜进行场发射扫描电子显微镜观察、耐点滴腐蚀试验、膜重试验以及疲劳性能测试.结果表明:有机酸、缓冲添加剂在铝合金硫酸阳极氧化成膜过程中可以缓冲硫酸对膜层的溶解,提高氧化膜层的致密性和耐腐蚀性能,同时降低了氧化过程对铝合金基体的疲劳损伤;另外,在15 V电压下氧化5 min再在25 V电压下氧化5 min,获得的氧化膜层性能与硼酸-硫酸工艺条件下15 V电压氧化20 min所获得的膜层性能相当,其中的有机酸添加剂为YP添加剂,快速成膜缓冲剂为YJ缓冲剂.
The LY12CZ aluminum alloy was anodized by gradient voltage of 15 ~ 25 V by adding organic acid additive and rapid film-forming buffer in 45 g / L sulfuric acid solution to obtain a new method of anodic oxidation of boric acid- Sulfuric acid anodized aluminum alloy new rapid environmental anodic oxidation process.On the oxide film obtained by field emission scanning electron microscopy, resistance to drip corrosion test, the film weight test and fatigue properties of the test results show that: organic acids, buffer additives in the aluminum During the process of anodic oxidation of the alloy sulfuric acid, the dissolution of sulfuric acid can be buffered and the compactness and corrosion resistance of the oxide film layer can be buffered, meanwhile, the fatigue damage to the aluminum alloy matrix during the oxidation process can be reduced. In addition, 5 min and then at 25 V for 5 min, the performance of the obtained oxide film was comparable to that obtained by oxidation of 15 V at 20 V for 20 min in boric acid-sulfuric acid process. The organic acid additive was YP additive, Membrane buffer is YJ buffer.