Lanthanum-organic acid composite sealing technique of aluminum alloy anodized film at room temperature
Studied the rapid sealing technology of aluminum alloy anodizing film at room temperature.Lanthanum sulfate was mixed with tannic acid,tartaric acid,boric acid and citric acid respectively,and the anodic oxide film was sealed by these four sealing methods.The element composition of surface and cross section was analyzed by X-ray photoelectron spectroscopy(XPS)and energy dispersive X-ray spectrometer(EDS)spectrum.Electrochemical impedance spectroscopy and Tafel test were used to analyze the corrosion resistance performance.The results showed that using 1 g/L lanthanum sulfate and 5 g/L tannic acid,a flat and dense sealing effect can be achieved under 25℃and 25 min.The corrosion resistance of the sample has significantly improved.Based on the above results,the mechanism of lan-thanum organic acid composite sealing was analyzed.
aluminium alloyanodic oxidationseal at normal temperaturenickel free sealing
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