Effect of ammonium adipate on properties of hard oxide films prepared on aluminum alloy
Hard oxide films were prepared on 2024 aluminum alloy matrix from the sulfuric acid elec-trolyte with and without ammonium adipate, and the effect of ammonium adipate concentration on the microstructure, chemical composition, thickness, hardness, wear resistance and corrosion resistance of the hard oxide film was studied. The results show that adding appropriate amount of ammonium adi-pate promote the formation of dense and thicker hard oxide film, the hardness increased, and the wear resistance and corrosion resistance improved significantly. The hard oxide film prepared by adding 20 g/L ammonium adipate has the best surface uniformity and densification, the thickness and hardness reach 21.2 μm and 380.8 HV, respectively. The friction coefficient and wear loss are only 0.52 mg and 0.87 mg, and the corrosion current density is decreased by more than one order of magnitude compared with aluminum alloy matrix, indicating that the hard oxide film prepared by adding 20 g/L ammonium adipate possesses better comprehensive performance. However, adding ammonium adipate does not change the elemental composition of the hard oxide film. The improvement of overall performance of the hard oxide film is mainly due to adding appropriate amount of ammonium adipate participates in the formation of hard oxide film and affects the aluminum ion conduction process, and then promotes the hard oxide film thickening and gradually improve the densification.
hard oxide filmaluminum alloyammonium adipatehardnesswear resistancecorrosion resistance
万方数据
维普
