Photochemical treatment solution and chemical cleaning method for surface pretreatment of aluminum or aluminum alloy

An aluminum alloy surface, chemical cleaning technology, applied in the field of photochemical treatment liquid for aluminum alloy surface pretreatment and chemical cleaning, can solve the problems of unsatisfactory corrosion resistance of the coating layer, low production efficiency, pollution of the environment, etc. Friendly, close to aluminum consumption, low aluminum consumption effect

Active Publication Date: 2019-01-01
哈尔滨哈船新材料科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention aims to solve the technical problems of polluting the environment, low production efficiency, high water consumption, and unsatisfactory corrosion resistance of the coating layer in the existing aluminum alloy chemical cleaning; and provides a photochemical treatment liquid for surface pretreatment of aluminum or aluminum alloy and chemical cleaning methods

Method used

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  • Photochemical treatment solution and chemical cleaning method for surface pretreatment of aluminum or aluminum alloy
  • Photochemical treatment solution and chemical cleaning method for surface pretreatment of aluminum or aluminum alloy
  • Photochemical treatment solution and chemical cleaning method for surface pretreatment of aluminum or aluminum alloy

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specific Embodiment approach 1

[0031] Specific embodiment one: In this embodiment, the components in the photochemical treatment solution for surface pretreatment of aluminum or aluminum alloy and the concentration of each component:

[0032]

[0033] Rhine Chemicals water-based aluminum corrosion inhibitor RC5820 is produced by Aobei Technology (Shanghai) Co., Ltd.

[0034] The alloy surface pretreatment chemical cleaning method of the present embodiment is carried out according to the following steps:

[0035] Step 1. Wipe the surface of aluminum or aluminum alloy with gasoline at a temperature of 50°C and a concentration of 25g / 500ml to remove oil, and dry at 50°C for 15 minutes;

[0036] Step 2. Rinse twice with hot water at a temperature of 50°C, each time for 5 minutes;

[0037] Step 3, then wash with alkali at a temperature of 65°C and a concentration of 25g / 500ml NaOH solution for 15 minutes;

[0038] Step 4, then rinse twice with hot water at a temperature of 30°C, each time for 5 minutes;

...

specific Embodiment approach 2

[0041] Specific embodiment two: In this embodiment, the components in the photochemical treatment solution for surface pretreatment of aluminum or aluminum alloy and the concentration of each component:

[0042]

[0043] In this embodiment, the alloy surface pretreatment chemical cleaning method is operated according to Embodiment 1.

[0044] Adopt following test to verify invention effect

[0045] 1. Potentiodynamic polarization curve test, see the results figure 1

[0046] Using the potentiodynamic polarization curve, we can obtain important parameters such as corrosion potential and corrosion current density (for the case of passivation area, there are also passivation current and passivation interval) by fitting the linear part of the cathode and anode Tafel regions. , and the fitting results are shown in Table 1.

[0047] Table 1 Electrochemical parameters of polarization curves of aluminum alloys

[0048]

[0049] Second, scanning electron microscope characteriza...

specific Embodiment approach 3

[0057] Specific embodiment three: In this embodiment, the components in the photochemical treatment liquid for surface pretreatment of aluminum or aluminum alloy and the concentration of each component:

[0058]

[0059] In this embodiment, the alloy surface pretreatment chemical cleaning method is operated according to the first specific embodiment.

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Abstract

A photochemical treating fluid for pretreatment of aluminum or aluminum alloy surface, and a chemical cleaning method belong to the technical field of aluminum alloy surface pretreatment. The invention aims to solve the technical problems of environmental pollution, low production efficiency, high water consumption and unsatisfactory corrosion resistance of coating in the existing aluminum alloy chemical cleaning method. The photochemical treating fluid comprises phytic acid, NaHF<2>, Fe(NO)<3>, RC5820 and triethanolamine oleate. The chemical cleaning method comprises the steps: firstly, wiping the aluminum or aluminum alloy surface with gasoline to remove oil and dry; secondly, washing with hot water; thirdly, alkaline washing; fourthly, washing with hot water; fifthly, photochemical treatment; sixthly, natural drying. In the invention, through treating the aluminum alloy surface with the chemical cleaning method, the corrosion resistance of the aluminum alloy surface is improved, and aluminum consumption is not much different; water consumption is reduced greatly, and the technological process is short; and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface pretreatment; in particular, it relates to a photochemical treatment liquid for aluminum alloy surface pretreatment and a chemical cleaning method. Background technique [0002] Among metal elements, aluminum and its alloys have high application value, such as low density, light weight, good electrical conductivity, and good thermal conductivity. Because of these advantages, aluminum and aluminum alloys have been widely used in industrial production. With the development of modern industry, the requirements for surface treatment of aluminum and aluminum alloys are also increasing. Anodizing and chemical oxidation are two of the most popular surface treatment processes for aluminum alloys. The ease of operation and low cost are the reasons why the chemical conversion method has attracted much attention. The use of aluminum and its alloys in the transportation industry, construction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F3/03C23G1/12C23G1/04
CPCC23F3/03C23G1/04C23G1/125
Inventor 邵亚薇孙艳解光胜吕文静张明明师超郑宏鹏
Owner 哈尔滨哈船新材料科技有限公司
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