Alkaline chemical polishing method and adopted alkaline chemical polishing solution thereof

A chemical polishing and alkaline technology, applied in the field of metal surface treatment, can solve problems such as unfriendly environment, achieve the effects of environmental friendliness, improve brightness, and improve flatness

Active Publication Date: 2015-06-10
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the addition of pyrophosphate and hexametaphosphate is still not friendly to the environment

Method used

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  • Alkaline chemical polishing method and adopted alkaline chemical polishing solution thereof
  • Alkaline chemical polishing method and adopted alkaline chemical polishing solution thereof
  • Alkaline chemical polishing method and adopted alkaline chemical polishing solution thereof

Examples

Experimental program
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Embodiment 1）

[0025] The present embodiment carries out alkaline chemical polishing to the surface of 7075 aluminum alloy, and has the following steps:

[0026] ① Soak the 7075 aluminum alloy in absolute ethanol for 5 minutes for pretreatment, and then wash it with deionized water.

[0027] ②Put the pretreated 7075 aluminum alloy into the alkaline chemical polishing solution, and perform alkaline chemical polishing at a temperature of 60°C for 10s.

[0028] The alkaline chemical polishing liquid of the present embodiment is the aqueous solution that is made up of the component of following concentration: sodium hydroxide 200g / L; Sodium nitrate 100g / L; Sodium acetate 200g / L; Sodium bromate 50g / L; Sodium fluoride 10g / L; copper sulfate 1g / L.

[0029] ③Put the polished 7075 aluminum alloy into dilute nitric acid for neutralization, then put it into deionized water for ultrasonic cleaning for 10 minutes, and finally take out the hot air and dry it.

[0030] The metallographic micrograph of the...

Embodiment 2～ Embodiment 5）

[0032] Each example is basically the same as Example 1, except for the composition of the alkaline chemical polishing solution, see Table 1 for details.

[0033] Table 1

[0034] Example 1 Example 2 Example 3 Example 4 Example 5 sodium hydroxide 200g / L 250g / L 200g / L 300g / L 150g / L sodium nitrate 100g / L 150g / L 100g / L 175g / L 75g / L sodium acetate 200g / L 250g / L 200g / L 300g / L 150g / L Sodium bromate 50g / L 75g / L 50g / L 100g / L 25g / L sodium fluoride 10g / L 15g / L 10g / L 17.5g / L 7.5g / L Sulfate Copper sulfate 1g / L Copper sulfate 1g / L Copper sulfate 2g / L Zinc sulfate 2g / L Nickel sulfate 1g / L

Embodiment 6）

[0036] The present embodiment carries out alkaline chemical polishing to the surface of 1060 aluminum alloy, and has the following steps:

[0037] ① Soak the 1060 aluminum alloy in absolute ethanol for 5 minutes for pretreatment, and then wash it with deionized water.

[0038] ②Put the pretreated 1060 aluminum alloy into the alkaline chemical polishing solution, and perform alkaline chemical polishing at a temperature of 50°C for 10s.

[0039] The alkaline chemical polishing liquid of the present embodiment is the aqueous solution that is made up of the component of following concentration: sodium hydroxide 250g / L; Sodium nitrate 150g / L; Sodium acetate 250g / L; Sodium bromate 75g / L; Sodium fluoride 15g / L; zinc sulfate 2g / L.

[0040] ③Put the polished 1060 aluminum alloy in dilute nitric acid for neutralization, then put it in deionized water for ultrasonic cleaning for 10 minutes, and finally take out the hot air and dry it.

[0041] The metallographic microscope photo of the...

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Abstract

The invention discloses an alkaline chemical polishing method and an adopted alkaline chemical polishing solution thereof. The method comprises the steps that aluminum and/or aluminum alloy is put in absolute ethyl alcohol to conduct pretreatment, and then deionized water is utilized to wash the aluminum and/or the aluminum alloy cleanly; the pretreated aluminum and/or the pretreated aluminum alloy is put in the alkaline chemical polishing solution to conduct alkaline chemical polishing; the polished aluminum and/or the polished aluminum alloy is sequentially put in dilute nitric acid to be neutralized and put in the deionized water to conduct ultrasonic cleaning for 5-15 min, and then the treated aluminum and/or the treated aluminum alloy is taken out and dried. The alkaline chemical polishing solution is an aqueous solution composed of the following components, 100-500 g/L sodium hydroxide, 50-200 g/L sodium nitrate, 100-500 g/L sodium acetate, 10-150 g/L sodium bromate, 5-20 g/L sodium fluoride and 0.1-4 g/L heavy-metal sulfate. The alkaline chemical polishing method is friendly to the environment, the brightness and the flatness of polished aluminum alloy surface are both better.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an alkaline chemical polishing method and an alkaline chemical polishing liquid used therein. Background technique [0002] Methods for polishing aluminum and aluminum alloy surfaces mainly include mechanical methods, electrochemical methods and chemical methods. Mechanical polishing and electrochemical polishing have certain requirements on the shape and size of parts, so their use is limited. However, chemical polishing is not limited by the shape and size of parts, and can process more parts at one time. Therefore, it is currently the most commonly used polishing method. [0003] The existing chemical polishing methods mainly use acidic chemical polishing liquid (containing phosphoric acid, sulfuric acid and nitric acid, commonly known as three-acid polishing liquid). The advantages of acidic chemical polishing liquid are: better polishing effect, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F3/02
CPCC23F3/02
Inventor 马迪李树白徐龙贵戈浩
Owner JIANGSU UNIV OF TECH
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