CN103469209A - Pretreatment technique for lithium aluminum alloying and milling - Google Patents

Pretreatment technique for lithium aluminum alloying and milling Download PDF

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Publication number
CN103469209A
CN103469209A CN2013104267943A CN201310426794A CN103469209A CN 103469209 A CN103469209 A CN 103469209A CN 2013104267943 A CN2013104267943 A CN 2013104267943A CN 201310426794 A CN201310426794 A CN 201310426794A CN 103469209 A CN103469209 A CN 103469209A
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CN
China
Prior art keywords
washing
milling
wash
li alloy
sodium dichromate
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CN2013104267943A
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Chinese (zh)
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CN103469209B (en
Inventor
张燕燕
解二伟
张雪锋
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沈阳飞机工业(集团)有限公司
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Priority to CN201310426794.3A priority Critical patent/CN103469209B/en
Publication of CN103469209A publication Critical patent/CN103469209A/en
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Publication of CN103469209B publication Critical patent/CN103469209B/en

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Abstract

The invention discloses a pretreatment technique for lithium aluminum alloying and milling. The technique comprises the following steps: 1) emitting light; 2) washing by cold water; 3) etching by alkali; 4) washing by warm water; 5) washing by cold water; 6) emitting light; 7) washing by cold water; 8) anodizing by sulfuric acid; 9) washing by cold water; 10) filling by sodium dichromate; 11) washing by warm water; 12) spraying; 13) drying. By adopting the pretreatment technique, the binding force of spare parts and a protecting adhesive is greatly improved after the pretreatment process is improved by leading in a sulfuric acid anodizing process; the milling erosion phenomenon is avoided; the rejection rate is reduced; the product quality is improved.

Description

A kind of Al-Li alloy milling preprocessing technical method

Technical field

The present invention relates to a kind of Al-Li alloy milling preprocessing technical method.

Background technology

Al-Li alloy has the properties such as low density, high elastic coefficient, high specific strength and high specific stiffness, and in industrial sector, application is more and more extensive.In actual milling is produced, because Al-Li alloy material itself and chemical milling protective colloid bonding force are very poor, milling district over etching (claiming again: lick limit) phenomenon often appears in the part after milling, causes parts batch to reprocess, and even scraps.Corrode part and carry out that machinery is added work or new system is the way that current producer is used crossing after milling, this way efficiency is lower, and machinery is added work and delayed work and mistake, and affect quality product, and new workpieces increases production cost especially, and newly workpieces can't be ensured the quality of products.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, a kind of Al-Li alloy milling preprocessing technical method is provided.

The technical solution used in the present invention is:

A kind of Al-Li alloy milling preprocessing technical method, processing method is as follows: 1) bright dipping: remove the heavier greasy dirt of piece surface; 2) cold wash; 3) caustic corrosion: remove part surface oxidized skin; 4) Warm Wash; 5) cold wash; 6) bright dipping: recover part light matrix; 7) cold wash; 8) sulfur acid anodizing; 9) cold wash; 10) sodium dichromate 99 is filled; 11) Warm Wash; 12) spray; 13) drying.

Above-mentioned Al-Li alloy milling preprocessing technical method, described sulfur acid anodizing technique is as follows: sulfuric acid ρ=1.84g/ mL, be mixed with 97 ~ 110mL/L, temperature is 13 ~ 25 ℃, current density 0.8A/dm 3~ 1.5 A/dm 3, voltage 13V ~ 18V, time 10min.

Above-mentioned Al-Li alloy milling preprocessing technical method, described sodium dichromate 99 fill process is as follows: sodium dichromate aqueous solutio (Na 2cr 2o 72H 2o), 45g/L ~ 65 g/L, the pH value is 5.0 ~ 6.0, temperature: 90 ~ 100 ℃, time 10min.

Beneficial effect of the present invention: the present invention, by after introducing sulfur acid anodizing process modification pre-treating technology, has improved the bonding force of part with protection glue greatly, has avoided milling to cross erosion, has reduced condemnation factor, has improved quality product.This overlaps new Al-Li alloy milling pre-treatment flow process, and operation is simple, can be widely used in Al-Li alloy milling and related process.

Embodiment

A kind of Al-Li alloy milling preprocessing technical method, processing method is as follows:

1) bright dipping: the part dress immerses bright dipping in salpeter solution after hanging, and removes the heavier greasy dirt of piece surface, technology controlling and process: get the nitric acid of ρ=1.42g/ mL, be mixed with the aqueous nitric acid of 210 ~ 360mL/L, under room temperature condition, soak 2 ~ 5min;

2) cold wash: part cleans in cold water;

3) caustic corrosion: remove part surface oxidized skin, technology controlling and process: aqueous sodium hydroxide solution, 20g/L ~ 35g/L, 40 ~ 55 ℃ of temperature, time 0.5 ~ 2min;

4) Warm Wash: part cleans in the warm water of 40 ~ 60 ℃;

5) cold wash: part cleans in cold water;

6) bright dipping: recover part light matrix, technology controlling and process: get the nitric acid of ρ=1.42g/ mL, be mixed with the aqueous nitric acid of 210 ~ 360mL/L, under room temperature condition, soak time is to till part gloss;

7) cold wash: part cleans in cold water;

8) sulfur acid anodizing: sulfuric acid ρ=1.84g/ mL, be mixed with 97 ~ 110mL/L, temperature is 13 ~ 25 ℃, current density 0.8A/dm 3~ 1.5 A/dm 3, voltage 13V ~ 18V, time 10min;

9) cold wash: part cleans in cold water;

10) sodium dichromate 99 is filled: sodium dichromate 99 (Na 2cr 2o 72H 2o) aqueous solution, 45g/L ~ 65 g/L, the pH value is 5.0 ~ 6.0, temperature: 90 ~ 100 ℃, time 10min;

11) Warm Wash: part cleans in the warm water of 40 ~ 60 ℃;

12) spray: room temperature water spray 1 ~ 2min;

13) drying: seasoning or pressurized air dry up.

Claims (3)

1. an Al-Li alloy milling preprocessing technical method, is characterized in that processing method is as follows: 1) bright dipping: remove the heavier greasy dirt of piece surface; 2) cold wash; 3) caustic corrosion: remove part surface oxidized skin; 4) Warm Wash; 5) cold wash; 6) bright dipping: recover part light matrix; 7) cold wash; 8) sulfur acid anodizing; 9) cold wash; 10) sodium dichromate 99 is filled; 11) Warm Wash; 12) spray; 13) drying.
2. a kind of Al-Li alloy milling preprocessing technical method as claimed in claim 1, it is characterized in that: described sulfur acid anodizing technique is as follows: sulfuric acid ρ=1.84g/ mL, be mixed with 97 ~ 110mL/L, temperature is 13 ~ 25 ℃, current density 0.8A/dm 3~ 1.5 A/dm 3, voltage 13V ~ 18V, time 10min.
3. a kind of Al-Li alloy milling preprocessing technical method as claimed in claim 1 or 2, it is characterized in that: described sodium dichromate 99 fill process is as follows: sodium dichromate aqueous solutio 45g/L ~ 65 g/L, the pH value is 5.0 ~ 6.0, temperature: 90 ~ 100 ℃, time 10min.
CN201310426794.3A 2013-09-18 2013-09-18 A kind of Al-Li alloy milling preprocessing technical method CN103469209B (en)

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CN201310426794.3A CN103469209B (en) 2013-09-18 2013-09-18 A kind of Al-Li alloy milling preprocessing technical method

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Application Number Priority Date Filing Date Title
CN201310426794.3A CN103469209B (en) 2013-09-18 2013-09-18 A kind of Al-Li alloy milling preprocessing technical method

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CN103469209B CN103469209B (en) 2015-10-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1006000B (en) * 1985-04-23 1989-12-06 东北工学院 Method to produce white film on surface of aluminum or aluminum alloys
CN1089668A (en) * 1993-01-16 1994-07-20 成都科技大学 The composite coloration method of aluminium and aluminium alloy
JP2001049492A (en) * 1999-08-11 2001-02-20 Nippon Alum Co Ltd Anodizing treating method
CN1303957A (en) * 2000-01-13 2001-07-18 沈阳黎明铝门窗工程公司 Artificial stainless steel colour electro-colour process for aluminium sections
CN103173833A (en) * 2013-03-07 2013-06-26 洛阳伟信电子科技有限公司 Anodization closing method for improving corrosion resistance of aluminum alloy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1006000B (en) * 1985-04-23 1989-12-06 东北工学院 Method to produce white film on surface of aluminum or aluminum alloys
CN1089668A (en) * 1993-01-16 1994-07-20 成都科技大学 The composite coloration method of aluminium and aluminium alloy
JP2001049492A (en) * 1999-08-11 2001-02-20 Nippon Alum Co Ltd Anodizing treating method
CN1303957A (en) * 2000-01-13 2001-07-18 沈阳黎明铝门窗工程公司 Artificial stainless steel colour electro-colour process for aluminium sections
CN103173833A (en) * 2013-03-07 2013-06-26 洛阳伟信电子科技有限公司 Anodization closing method for improving corrosion resistance of aluminum alloy

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