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...

Examples

preparation example Construction

[0028] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the concentration of sulfuric acid in the oxidation tank is 170-180g / L, the concentration of aluminum ions is 12-16g / L, the temperature of the oxidation tank is The temperature is 16-17°C, the power supply voltage is 12.0-18.0V, and the anodic oxidation is carried out for 30-60 minutes, and an aluminum product covered with an oxide film on the surface can be obtained.

[0029] The outer surface of the oxide film covering the surface of the aluminum product obtained in step S2 is a porous layer, and the bottom layer of the oxide film is in contact with the aluminum substrate as an active layer. The pore size and distribution of the porous layer are one of the key factors affecting the electrolytic coloring effect on the surface of aluminum products, and the diameter and uniformity of the porous layer are closely related to the temperature of the ox...

Embodiment 1

[0037] A kind of monotin salt electrolytic coloring method that is used for vertical electrolyzer, described method comprises processing steps:

[0038] Step S1. Surface purification treatment of aluminum products: first place the aluminum products in a 13% sulfuric acid bath for 5 minutes to degrease, rinse them with clean water, then place the aluminum products in a 4.0% sodium hydroxide bath for 10 minutes, Then rinse off with plenty of water.

[0039] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the concentration of sulfuric acid in the oxidation tank is 170g / L, the concentration of aluminum ions is 16g / L, the oxidation temperature is 16°C, and the voltage is 18.0V , anodized for 30min;

[0040] Step S3. Electrolytic coloring: the oxidized aluminum product is placed in a vertical electrolytic cell, and the electrolyte is a mono-tin salt electrolyte, including: stannous sulfate 6g / L, free sulf...

Embodiment 2

[0043] A kind of monotin salt electrolytic coloring method that is used for vertical electrolyzer, described method comprises processing steps:

[0044] Step S1. Surface purification treatment of aluminum products: first place the aluminum products in a 15% sulfuric acid bath for 3 minutes to degrease, rinse them with clean water, then place the aluminum products in a 5% sodium hydroxide bath for 5 minutes, Then rinse off with plenty of water.

[0045] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the sulfuric acid concentration in the oxidation tank is 180g / L, the aluminum ion concentration is 12g / L, the oxidation temperature is 17°C, and the voltage is 12.0V , anodized for 60min;

[0046] Step S3. Electrolytic coloring: the oxidized aluminum product is placed in a vertical electrolytic cell, and the electrolyte is a mono-tin salt electrolyte, including: stannous sulfate 10g / L, free sulfuric acid...

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...

Examples

preparation example Construction

[0028] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the concentration of sulfuric acid in the oxidation tank is 170-180g / L, the concentration of aluminum ions is 12-16g / L, the temperature of the oxidation tank is The temperature is 16-17°C, the power supply voltage is 12.0-18.0V, and the anodic oxidation is carried out for 30-60 minutes, and an aluminum product covered with an oxide film on the surface can be obtained.

[0029] The outer surface of the oxide film covering the surface of the aluminum product obtained in step S2 is a porous layer, and the bottom layer of the oxide film is in contact with the aluminum substrate as an active layer. The pore size and distribution of the porous layer are one of the key factors affecting the electrolytic coloring effect on the surface of aluminum products, and the diameter and uniformity of the porous layer are closely related to the temperature of the ox...

Embodiment 1

[0037] A kind of monotin salt electrolytic coloring method that is used for vertical electrolyzer, described method comprises processing steps:

[0038] Step S1. Surface purification treatment of aluminum products: first place the aluminum products in a 13% sulfuric acid bath for 5 minutes to degrease, rinse them with clean water, then place the aluminum products in a 4.0% sodium hydroxide bath for 10 minutes, Then rinse off with plenty of water.

[0039] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the concentration of sulfuric acid in the oxidation tank is 170g / L, the concentration of aluminum ions is 16g / L, the oxidation temperature is 16°C, and the voltage is 18.0V , anodized for 30min;

[0040] Step S3. Electrolytic coloring: the oxidized aluminum product is placed in a vertical electrolytic cell, and the electrolyte is a mono-tin salt electrolyte, including: stannous sulfate 6g / L, free sulf...

Embodiment 2

[0043] A kind of monotin salt electrolytic coloring method that is used for vertical electrolyzer, described method comprises processing steps:

[0044] Step S1. Surface purification treatment of aluminum products: first place the aluminum products in a 15% sulfuric acid bath for 3 minutes to degrease, rinse them with clean water, then place the aluminum products in a 5% sodium hydroxide bath for 5 minutes, Then rinse off with plenty of water.

[0045] Step S2. Preparation of oxide film: place the aluminum product after the surface purification treatment in an oxidation tank, the sulfuric acid concentration in the oxidation tank is 180g / L, the aluminum ion concentration is 12g / L, the oxidation temperature is 17°C, and the voltage is 12.0V , anodized for 60min;

[0046] Step S3. Electrolytic coloring: the oxidized aluminum product is placed in a vertical electrolytic cell, and the electrolyte is a mono-tin salt electrolyte, including: stannous sulfate 10g / L, free sulfuric acid...