Preparation technology of high-hardness color aluminum alloy oxidation layer

Abstract

The invention discloses a preparation technology of a high-hardness color aluminum alloy oxidation layer. The preparation technology comprises the steps that S01, pretreatment is conducted, specifically, 6063 aluminum alloy is subjected to degreasing, alkaline cleaning, neutralizing and water cleaning; S02, active oxidation is conducted, specifically, the aluminum alloy treated through the step S01 is put into active oxidation liquid to be subjected to electrolysis active oxidation; and S03, secondary electrolysis treatment is conducted, specifically, the pretreated aluminum alloy is subjectedto electrolytic oxidation in electrolyte which comprises 6-8 g / L of sodium silicate, 12-15 g / L of citric acid, 1.5-1.8 g / L of sodium tungstate, 0.2-0.3 g / L of EDTA, 0.6-0.7 g / L of ammonium phosphotungstate and the balance water, the voltage is 280-285 V, oxidation treatment lasts for 30-35 min, and a blue-green oxidation film which is 150-155 [mu]m thick is prepared. According to the preparationtechnology, the electrolysis technology of the preparation technology conducts adaptive configuration on the pretreatment technology and the active technology, so that the pretreatment technology andthe active technology are more reasonable, micro-arc oxidation is facilitated, and a ceramic layer generated through electrolysis is uniform, compact, abrasion resistant and unfading.

Description

technical field [0001] The invention belongs to the aluminum alloy surface processing technology, and in particular relates to a preparation process of a high-hardness colored aluminum alloy oxide layer. Background technique [0002] Aluminum alloy surface color plasma electrolytic oxidation (Plasma Electrolytic Oxidation), also known as Microarc Discharge Oxidation or Microarc Oxidation, is through the combination of electrolyte and corresponding electrical parameters, on the surface of aluminum alloy Relying on the instantaneous high temperature and high pressure generated by arc discharge, the surface treatment technology grows a ceramic film layer mainly composed of aluminum alloy oxide. Plasma electrolytic oxidation technology can be used to grow and produce oxide ceramic film with good wear resistance and corrosion resistance in situ on the surface of aluminum alloy. The bonding force between the ceramic film and the aluminum alloy substrate is strong, the film thickne...

AI Technical Summary

Problems solved by technology

In order to obtain a beautiful appearance, eliminate or reduce reflection, and improve wear resistance and corrosion resistance, in many applications, it is necessary to prepare 6063 deformed aluminum alloys into oxide films with different tones such as black, blue, and yellow. Ordinary anodic oxidation Although the technology can realize film formation and coloring, the coloring layer is thin, especially the impurity elements such as silicon and magnesium in the 6063 aluminum alloy composition make the coloring layer quality of the anodic oxidation film low, the coloring layer is thin and easy to fall off, and it is easy to fall off under ultraviolet light. It is easy to fade and change color under the irradiation of sunlight, which is far behind the plasma electrolytic oxide film