Single tin salt electrolytic coloring method for vertical hanging type electrolytic cell

Abstract

The invention discloses a single tin salt electrolytic coloring method for a vertical hanging type electrolytic cell. The method comprises the following process steps of step S1, surface purificationtreatment of an aluminum product; step S2, preparation of an oxidation film: placing the aluminum product subjected to surface purification treatment in an oxidation tank, wherein the concentration ofsulfuric acid in the oxidation tank is 170-180 g / L, the concentration of aluminum ions is 12-16 g / L, the oxidation temperature is 16-17 DEG C, the voltage is 12.0-18.0V, and anodic oxidation is carried out for 30-60min; step S3, electrolytic coloring: placing the oxidized aluminum product in the electrolytic cell, wherein the pH of a single tin salt electrolyte is 0.5-0.8, the electrolysis temperature is 18-20 DEG C, the voltage of an alternating current power supply is 16-18V, and electrolytic coloring of the aluminum product in the circulating single tin salt electrolyte is carried out for200-250S; and step S4, water washing post-treatment. According to the single tin salt electrolytic coloring method for the vertical hanging type electrolytic cell, the champagne-color aluminum productwith bright and uniform color and strong metal texture can be obtained, the emission of nickel-containing wastewater and waste residues is greatly reduced, and the pollution discharge cost of enterprises is reduced.

Description

technical field [0001] The invention relates to the technical field of surface treatment of aluminum products, in particular to a single tin salt electrolytic coloring method used in a vertically suspended electrolytic cell. Background technique [0002] Electrolytic coloring is a common method for surface treatment of aluminum products. Electrolytic coloring can not only make aluminum products have a decorative effect, but also improve the corrosion resistance of aluminum products. In the existing electrolytic coloring process of aluminum products, a vertical-hanging oxidation electrophoresis coloring production line is usually used. The electrolytic cell body of the vertical-hanging oxidation electrophoresis coloring production line is 7 meters high, 9 meters long, and 3 meters wide, and its volume is generally about 200 cubic meters. It is difficult to ensure that the color of aluminum alloy profiles is uniform and stable in the electrolytic coloring production of the ver...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a single-tin salt electrolytic coloring method for a vertically suspended electrolytic cell, aiming to solve the problem of using vertical tin salt in the coloring and oxidation process of aluminum products in the prior art In the hanging electrolytic cell, the coloring of the single-tin salt electrolyte has the defects of uneven coloring, unstable product quality, and poor corrosion resistance of aluminum products.