Device for forming photoselective absorbing coating on the surface of wide-format metal substrate

Abstract

The invention provides a device for forming a light-selective absorbing coating on the surface of a wide-format metal base strip, which includes a coating tank with a first aluminum strip inlet and a first aluminum strip exit on opposite sides, and the coating tank is divided into two parts. It is a sub-slot and a mother slot. The sub-slot is placed slightly above the mother slot. On the opposite sides of the sub-slot, corresponding to the first aluminum strip entrance and the first aluminum strip exit, the second aluminum strip entrance and the second aluminum strip entrance are also provided. Two aluminum strip outlets; it also includes a plating solution circulation pump, the suction port of the plating solution circulation pump is placed in the main tank, and the output port is placed in the sub tank; The second aluminum strip inlet and the second aluminum strip outlet naturally overflow into the mother tank, the invention does not need guide rollers, and the metal aluminum plate to be plated does not need to be turned over in the plating tank, and is always in a stable and smooth state, which is convenient The target coating with superior surface deposition performance is especially suitable for the surface coating of wide-format metal substrates, especially the production of light-selective absorption coatings.

Description

technical field [0001] The invention relates to a device for forming a coating on the surface of a metal substrate, in particular to a device for forming a coating or a light-selective absorbing coating on the surface of a wide-format metal substrate through anodic oxidation, electrophoresis or electroplating. Background technique [0002] refer to figure 1 , the traditional device that performs anodic oxidation and electroplating on a wide-format metal baseband, such as a wide-format aluminum strip, to form and deposit a spectral absorption layer or surface coloring on its surface. Its main structure and process principle are as follows: the metal baseband ( That is, the metal aluminum plate) 1 runs slowly, passes through the oxidation plating tank with the plating solution 3, and the plating solution and the metal aluminum plate carry out anodization reaction in the usual way. Under the appropriate conditions of temperature, time, plating solution type and concentration, t...

AI Technical Summary

Problems solved by technology

[0004] However, since the coating deposited on the surface of the metal aluminum plate has just been formed, it is relatively fragile. When the metal aluminum plate runs in a repeated and serpentine manner, the metal aluminum plate itself will repeatedly bend in different directions, which actually affects the stability of the coating, including the coating. Performance indicators such as the degree of compactness and uniformity have adverse effects

[0005] The role of the guide roller is to guide the metal aluminum plate to turn or bend, and to keep the metal aluminum plate in a smooth state when turning or bending. The traditional anodizing and electroplating devices using guide rollers still have these defects: 1. Since the metal aluminum plate needs to be overturned or bent in the coating tank, generally a plurality of guide rollers need to be distributed on the front and back sides of the metal aluminum plate, so that the side with the target coating on the metal aluminum plate will at least have direct contact with one guide roller. Contact, this generally has no obvious impact on the metal aluminum plate with a large target coating thickness, but it will have a greater impact on the heat-collecting aluminum plate used in solar heat-collecting devices, because the light on the heat-collecting aluminum plate Selective absorbing coatings require a large absorption ratio and a small emission ratio, which requires higher coating thickness. For example, in these application fields, the photoselective absorbing coatings generally required The thickness must be very small and thin, but when making the coating, if the guide roller is still used, the contact, rolling, scraping and scratches of the guide roller may directly cause the light selective absorption coating to be fabricated to be damaged. The layer is unqualified and becomes a defective product; 2. The traditional anodic oxidation device for making light selective absorption coating can meet the basic requirements for metal substrates with a width of less than 200mm, but for wider metal aluminum plates , when it passes through the coating tank slowly, the flatness of the surface of the metal aluminum plate is often difficult to meet the process requirements of coating production

[0006] In short, the traditional plating tank device is especially not suitable for making light-selective absorbing coatings on wide-format metal substrates, so further improvement is needed

Images