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Acid washing process for aluminum alloy profiles

An aluminum alloy and material acid technology, which is applied to the field of pickling process before spray painting of aluminum alloy profiles, can solve the problems of difficult elimination, easy peeling of the paint surface, preventing the effective combination of the paint surface and the aluminum alloy profiles, etc., so as to avoid chromatic aberration and avoid yellowing effect

Inactive Publication Date: 2020-03-13
湖州织里宝丰铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After pickling, the aluminum alloy profile is prone to "hanging dust", that is, the reaction product of the acid solution and the aluminum alloy profile is deposited on the surface of the aluminum alloy profile, and the reaction product has a certain adhesion with the aluminum alloy profile, which is difficult to remove Eliminate it in the subsequent steps, and prevent the effective combination of the paint surface and the aluminum alloy profile, causing the paint surface of the aluminum alloy profile to peel off easily after painting
Therefore, the aluminum alloy profiles processed by the existing pickling process have the disadvantage that the paint surface is easy to peel off after painting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1. A pickling process for aluminum alloy profiles, comprising the following steps,

[0017] a. Soak the aluminum alloy profile in acid solution for ultrasonic pickling, the ultrasonic frequency is 55KHz, and the pickling time is 2min, to obtain product A.

[0018] b. Rinse product A with high-pressure water flow at a flow rate of 35m / s to obtain product B.

[0019] c. Dry product B to obtain a finished product.

[0020] In the step a, in parts by weight, the acid solution is composed of 65 parts of dilute nitric acid, 10 parts of hydrogen peroxide and 1 part of sodium bifluoride, the concentration of nitric acid solution is 3mol / L, and the concentration of hydrogen peroxide is 30%.

[0021] In the step a, the pickling temperature is 55°C.

[0022] In the step b, the temperature of the high-pressure water flow is 70°C.

Embodiment 2

[0023] Example 2. A pickling process for aluminum alloy profiles, comprising the following steps,

[0024] a. Soak aluminum alloy profiles in acid solution for ultrasonic pickling, ultrasonic frequency 50KHz, pickling time 3min, to obtain product A,

[0025] b. Rinse product A with high-pressure water flow at a flow rate of 30m / s to obtain product B.

[0026] c. Dry product B to obtain a finished product.

[0027] In the step a, in parts by weight, the acid solution is composed of 80 parts of dilute nitric acid, 10 parts of hydrogen peroxide and 1 part of sodium bifluoride, the concentration of the nitric acid solution is 3mol / L, and the concentration of the hydrogen peroxide is 30%.

[0028] In the step a, the pickling temperature is 50°C.

[0029] In the step b, the temperature of the high-pressure water flow is 80°C.

Embodiment 3

[0030] Example 3. A pickling process for aluminum alloy profiles, comprising the following steps,

[0031] a. Soak aluminum alloy profiles in acid solution for ultrasonic pickling, ultrasonic frequency 60KHz, pickling time 1min, to obtain product A,

[0032] b. Rinse product A with high-pressure water at a flow rate of 40m / s to obtain product B.

[0033] c. Dry product B to obtain a finished product.

[0034] In the step a, in parts by weight, the acid solution is composed of 50 parts of dilute nitric acid, 10 parts of hydrogen peroxide and 1 part of sodium bifluoride, the concentration of nitric acid solution is 3mol / L, and the concentration of hydrogen peroxide is 30%.

[0035] In the step a, the pickling temperature is 60°C.

[0036] In the step b, the temperature of the high-pressure water flow is 60°C.

[0037] The aluminum alloy profiles processed by the invention have the advantage that the paint surface is not easy to peel off after spraying.

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PUM

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Abstract

The invention discloses an acid washing process for aluminum alloy profiles. The process includes the following steps: a, immersing the aluminum alloy profiles in an acid solution, and performing ultrasonic acid washing to obtain an A product, wherein the ultrasonic frequency is 50-60 kHz, and the acid washing time is 1-3 min; b, washing the A product by using a high-pressure water stream at a flow rate of 30-40 m / s to obtain a B product; and c, drying the B product to obtain a finished product, wherein in the step a, the acid solution is composed of the following materials in parts by weight:50-80 parts of dilute nitric acid, 10 parts of hydrogen peroxide and 1 part of sodium bifluoride, the concentration of the nitric acid solution is 3 mol / L, and the concentration of the hydrogen peroxide is 30%. The aluminum alloy profiles processed by the process have the advantage that a paint surface is not easy to peel off after paint spraying.

Description

technical field [0001] The invention belongs to the field of pickling technology of aluminum alloy profiles before painting. Background technique [0002] Aluminum alloy profiles generally need to be pickled before painting to remove stains and oxide layers on the surface of aluminum alloy profiles and improve the bonding strength of the paint surface. The existing pickling process is to soak the aluminum alloy profile in acid solution for pickling; the aluminum alloy profile is pickled and then washed with water to remove the residual acid solution on the surface; the aluminum alloy profile is washed with water and dried to avoid aluminum alloy The profile will further oxidize in the presence of moisture. After pickling, the aluminum alloy profile is prone to "hanging dust", that is, the reaction product of the acid solution and the aluminum alloy profile is deposited on the surface of the aluminum alloy profile, and the reaction product has a certain adhesion with the alu...

Claims

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Application Information

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IPC IPC(8): C23G1/12
CPCC23G1/125
Inventor 倪寿宝
Owner 湖州织里宝丰铝业有限公司
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