Research and Production Application of High Corrosion Resistance Anodizing Process for Red Copper and Aluminum Bronze Alloy

To improve the appearance and corrosion resistance of T1 red copper and QAl9-4 aluminum bronze alloys， an aqueous solution of sodium hydroxide and ammonium molybdate was used as the working solution to anodize T1 red copper and QAl9-4 aluminum bronze alloys.The microstructure， primary composition，and metallographic structure of the anodic oxide film on both materials were characterized using scanning electron microscopy， energy-dispersive spectroscopy， and metallographic microscopy， facilitating the optimization of anodic oxidation process parameters.The comprehensive performance of the anodic oxide film was assessed through appearance inspection， adhesion strength testing， high-temperature resistance， and neutral salt spray tests.Results indicated that under conditions of an anodic oxidation current density of 1.0 A/dm2， duration of 25～30 min，and a temperature range of 80～90 °C，a black oxide film of 1～3 μm thickness capable of withstanding temperatures up to 400 °C was achieved.Properly sealed anodic oxide f