TITANIUM-ZIRCONIUM COLOURED CHROMIUM-FREE PASSIVATION SOLUTION FOR SURFACE TREATMENT OF ALUMINIUM ALLOY, METHOD FOR TREATING ALUMINIUM ALLOY SURFACE USING SAME, AND USE THEREOF

摘要

Provided is a titanium-zirconium coloured chromium-free passivation solution for surface treatment of an aluminium alloy, which comprises the following components in a mass volume concentration: 0.01-80 g/L of a main film-forming agent, 0.01-80 g/L of an oxidizing agent, 0.01-50 g/L of a film-forming accelerator, 0.01-50 g/L of an inorganic film-forming auxiliary, 0.01-50 g/L of an organic film-forming protective agent, a pH regulator in an amount that the pH value of the solution is adjusted to 2-6, and water as a solvent. A method for treating an aluminium alloy surface comprises the following steps: firstly, diluting the coloured chromium-free passivation solution by 1 to 80 times; then impregnating an aluminium alloy subjected to a degreasing pretreatment in the passivation solution or spraying the passivation solution onto the surface of the aluminium alloy, wherein the operating temperature is 0°C-40°C; and reacting for 10-500 s, then taking out the aluminium alloy workpiece, washing same with water and drying same. Also disclosed is the use of the titanium-zirconium coloured chromium-free passivation solution.