Anodic oxidation dyeing process

Abstract

The invention provides an anodic oxidation dyeing process, which comprises a dyeing step and a color fading step: the dyeing step: the surface of a to-be-dyed workpiece is dyed by using an acid dye, and the surface of the to-be-dyed workpiece is an anodic oxidation film layer. A color fading step: soaking the dyed workpiece in a first solution, and setting the soaking time as required; the first solution is a sodium sulfate solution. The acid dye comprises a gray dye, an additive and a second solution; the gray dye comprises a black 420 dye, a black 411 dye and a red 102 dye; the additive comprises nickel-free hole sealing liquid; the second solution is a sodium sulfate solution. The concentration of the first solution is 0.2 g / L + / -0.01 g / L. The anodic oxidation dyeing process disclosed by the invention is simple in steps, can meet design requirements, and meanwhile, ensures the stability of the process.

Description

technical field [0001] The invention relates to the technical field of metal manufacturing and processing, in particular to an anodic oxidation dyeing process. Background technique [0002] Metal products, such as aluminum alloys, magnesium alloys or titanium alloys, are generally anodized to form an anodized film with better wear resistance on their surface. In order to diversify the surface color of the product, the product will be dyed or sprayed after anodizing. [0003] Dyeing is the most critical step in the anode manufacturing process. At the same time, it is also the most unstable and difficult to control station, and it is very dependent on the stability of the oxidation process. At present, there is a project design that has a small range of color difference control after dyeing, and the design requirements have very high requirements for a, b value and L value, not only the color depth should not be too dark, but also the color should not be too light. If the tr...

AI Technical Summary

Problems solved by technology

At present, there is a project design that has a small range of control of color difference after dyeing, and the design requires very high requirements for a, b and L values. It requires that the color depth should not be too deep, and at the same time, the color should not be too light

If the traditional dyeing method is used for fading and trimming, the L value and the a and b values ​​will change greatly at the same time. The traditional dyeing method can hardly meet the design requirements. At present, according to the design requirements, an L value that can reduce the representative depth is required. Range, and at the same time do not greatly affect the coloring method of a and b values

Images