With the increasing use of aluminum and aluminum alloys, and the increasing demand for its decoration and functionality, various requirements for electrolytic coloring have been proposed in production. The color film obtained by the electrolytic coloring skills of aluminum and aluminum alloys has excellent abrasion resistance, light resistance, heat resistance and corrosion resistance of various chemical media. It is more used for the decoration and protection of various profiles. . Because of the development and application of solar energy, the diversification of daily commodities, and the popularization of skilled arts, the color and luster of aluminum and aluminum alloy finished products have set very clear goals and requirements. For example, if the curtain wall of a large building in the city is silver-white and the reflection is too strong, it will affect the senses of pedestrians and affect air traffic, and it will briefly form optical pollution. Therefore, it is expected to use darker and softer bronze or other colors.
The decoration of indoor utensils or ordinary aluminum products is more gold, bronze or bronze, and more colors are expected. The solar water heater's heat sink needs dark black. All in all, with the continuous increase of the types of aluminum and aluminum alloy parts and the continuous increase in output, the aluminum electrolytic coloring skills will surely be more widely developed and used.
(I) Electrolytic coloring method According to the characteristics of its color, electrolytic coloring method can be divided into two types: one-step hair color and two-step hair color. One-step color development is also called overall color development or natural color development. It is a method of anodizing aluminum and aluminum alloy parts in organic acids to obtain a colored oxide film. There are also specific aluminum alloys that develop color during ordinary anodization. This method has three conditions: one is anodic oxidation coloring in organic acid electrolytic solution, one is alloy electrolytic coloring method, also known as natural coloring method, and the other is aluminum alloy organic acid solution cathode electrolysis. Color. No matter how you color it, the aluminum alloy is electrolyzed and developed in one step in various electrolyte solutions. The one-step electrolytic coloring skill scale is narrow, the operating conditions are strict and messy, and the color of the film layer is greatly affected by the type of data, the composition of the electrolyte and the operating skills, so it is bound to be limited.
The two-step coloring method is the treatment of aluminum anodizing and coloring. The first step is to oxidize aluminum and aluminum alloy parts into a film by ordinary anodizing. Then coloring, the coloring methods are divided into two methods: adsorption coloring and electrolytic coloring.
Therefore, the electrolytic coloring treatment of aluminum and aluminum alloys is divided into coloring methods, and is divided into three categories, namely, adsorption coloring, electrolytic coloring, and natural coloring.