A kind of aluminum and aluminum alloy surface pretreatment neutralizing liquid

An aluminum alloy surface and pretreatment technology, which is applied in the field of aluminum and aluminum alloy surface pretreatment, can solve problems such as nitric acid and hydrofluoric acid pollution of the environment, achieve good social and economic benefits, prevent redeposition of dirt, and reduce corrosion The effect of loss

Active Publication Date: 2018-08-28
FOSHAN RENCHANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it solves the problem that the traditional neutralization solution contains a large amount of nitric acid and hydrofluoric acid and seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for surface treatment of cast aluminum alloy ADC12 provided in this embodiment comprises the following steps:

[0028] (1) Degreasing treatment: use commercially available aluminum alloy degreasing powder or Renchang brand RC-151 zinc aluminum alloy degreasing powder 30 g / L, 50°C, 5 minutes. Wash with water for 15 seconds.

[0029] (2) Alkaline etching treatment: Use a commercially available aluminum alloy alkaline etchant or Renchang brand RC-120 aluminum alloy alkaline weak etchant at 30 g / L, at 45°C, and after 30 seconds, there will be black ash on the surface. Wash with water for 15 seconds.

[0030] (3) Neutralization treatment: The components of the neutralization solution are potassium persulfate 180 g / L, sulfuric acid 20 g / L, acetic acid 10 g / L, sodium fluoride 30 g / L, AE0-91 g / L, Sodium molybdate 1.5 g / L and balance water. The reaction temperature was 20°C, and the reaction time was 120 seconds. After the reaction, wash with water for 15 seconds,...

Embodiment 2

[0033] The method for surface treatment of cast aluminum alloy ADC12 provided in this embodiment comprises the following steps:

[0034] (1) degreasing treatment: with embodiment 1

[0035] (2) alkali etching treatment: with embodiment 1

[0036] (3) Neutralization treatment: The components of the neutralization solution are ammonium persulfate 150 g / L, sulfuric acid 10 g / L, glycolic acid 5 g / L, potassium fluoride 20 g / L, dodecylbenzenesulfonic acid Sodium 2 g / L, iron sulfate 0.5 g / L and balance water. The reaction temperature was 25°C, and the reaction time was 60 seconds. After the reaction, wash with water for 15 seconds, and the surface of the aluminum alloy is uniformly off-white.

[0037] (4) Subsequent treatment: electroplating. Use commercially available aluminum alloy electroplating solution or Renchang brand RC-NCY aluminum cyanide-free zinc dipping solution 250 ml / liter, at room temperature, first dip zinc for 30 seconds, wash with water and then plate cyanide-f...

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PUM

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Abstract

The invention discloses a neutralization solution for surface pretreatment of aluminum and aluminum alloy, and belongs to the technical field of metal surface treatment. The neutralization solution comprises an oxidant, a fluorine-containing compound, a stabilizer, a promoter, acid, a surfactant and water. The neutralization solution can effectively remove various harmful impurities and dirt produced after alkaline etching treatment in a pretreatment process for aluminum and aluminum alloy containing silicon or not containing silicon, is good in neutralization effect, stable in quality and favorable for subsequent treatment, and can form a uniform and activated surface. Meanwhile, a problem that the environment is severely polluted by a large amount of nitric acid and hydrofluoric acid in a conventional neutralization solution is solved.

Description

technical field [0001] The invention belongs to the technical field of surface pretreatment of aluminum and aluminum alloys, which removes various harmful impurities and dirt after alkali etching treatment, and can form a uniform and activated surface, which is beneficial to subsequent treatment. Background technique [0002] Aluminum alloy has low density and high specific strength, and is widely used in aviation, electronics, automobiles, construction, light industry and other fields. Aluminum alloy parts with high precision, complex shapes and light weight can be produced at high speed with die casting technology. Therefore, the use of die-casting aluminum alloys is increasing year by year. Due to the addition of elements such as silicon and copper, the corrosion resistance of die-cast aluminum alloy parts is significantly reduced, and it is difficult to obtain a uniform protective film in anodic oxidation treatment. In addition, its surface hardness is low, it is easy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/12
CPCC23G1/125
Inventor 田长春
Owner FOSHAN RENCHANG TECH
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