Corrosion device and method for preparing two-color film layer on metal surface

Abstract

The invention discloses a corrosion device for preparing a two-color film layer on a metal surface. The corrosion device comprises a tank mechanism, a liquid drewing mechanism and a control mechanism,a first tank body for containing metal products communicates with the bottom of a second tank body which is pumped with corrosive liquid, an overflow sensor is arranged at the edge of the first tankbody, and the partial surface of the metal products is subjected to corrosion treatment based on a connectivity principle and an overflow control method. The invention further provides a method basedon the corrosion device; the method comprises the steps that the metal products coated with a first color film layer is placed in the first tank body, and the corrosive liquid is entered the first tank body through buffering of the second tank body; a liquid level of the first tank body rises steadily and a rising speed is controllable so as to form a flat and uniform corrosion interface; and thensecond coloring treatment is performed on the corrosion part. The obtained products have a clear color boundary and an attractive appearance, and the method based on the corrosion device is particularly suitable for the production of the two-color film layer on the surface of irregular products or mesh structure products.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to an etching device and method for preparing a two-color film layer on a metal surface. Background technique [0002] The single metallic color or single-color surface of metal products can no longer meet people's needs for diversified product appearances. Therefore, while protecting the surface of metal products, the formation of colorful appearances for logos, aesthetics, etc. has gradually attracted attention. The production process is also growing. [0003] At present, the method of preparing a two-color or multi-color film layer on a metal surface is mainly obtained by machining a part of the area or etching after a mask. Patent application CN102747401A discloses "a processing method for aluminum parts", which mainly obtains different color film layers on the same aluminum part through multiple anodic oxidation dyeing treatments and appearance processing treatments; but f...

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Problems solved by technology

Patent application CN102747401A discloses "a processing method for aluminum parts", which mainly obtains different color film layers on the same aluminum part through multiple anodic oxidation dyeing treatments and appearance processing treatments; but for special-shaped products or nets It is very difficult to process the appearance of the internal and external structure of the porous structure product itself, and it is impossible to form a uniform two-color film layer inside and outside

Patent application CN101096772B discloses "the preparation method of multi-color pattern of anodic oxidation of titanium alloy", which mainly uses another low voltage to electrolyze another color after electrolyzing one color on the titanium alloy and removing part of the pattern by etching. By repeating the above steps many times, colorful patterns can be obtained. However, in the actual coloring process, due to the high control requirements of the etching process and the edges are not easy to control when etching and removing the pattern, there are certain transitional colors or black variegated colors, resulting in the interface between the two-color film layers. Not clear, resulting in a certain degree of poor appearance at the interface

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