EP4242346A1 - Solution de brillantage pour aluminium ou alliage d'aluminium et procédé de brillantage d'aluminium ou d'alliage d'aluminium - Google Patents

Solution de brillantage pour aluminium ou alliage d'aluminium et procédé de brillantage d'aluminium ou d'alliage d'aluminium Download PDF

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Publication number
EP4242346A1
EP4242346A1 EP22161155.1A EP22161155A EP4242346A1 EP 4242346 A1 EP4242346 A1 EP 4242346A1 EP 22161155 A EP22161155 A EP 22161155A EP 4242346 A1 EP4242346 A1 EP 4242346A1
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EP
European Patent Office
Prior art keywords
brightening
aluminium
solution
brightening solution
aluminum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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EP22161155.1A
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German (de)
English (en)
Inventor
Pinar Afsin
Guney Akdas
Can Akyil
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Politeknik Metal Sanayi Veticaret AI
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Politeknik Metal Sanayi Veticaret AI
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Publication date
Application filed by Politeknik Metal Sanayi Veticaret AI filed Critical Politeknik Metal Sanayi Veticaret AI
Priority to EP22161155.1A priority Critical patent/EP4242346A1/fr
Publication of EP4242346A1 publication Critical patent/EP4242346A1/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F3/00—Brightening metals by chemical means
    • C23F3/02—Light metals
    • C23F3/03—Light metals with acidic solutions

Definitions

  • the present invention refers to a pretreatment bath for anodizing aluminum or aluminum alloys and a process for anodizing aluminum or aluminum alloys on a substrate.
  • Aluminum can be polished to a high gloss, but it must be fully decontaminated before this is possible.
  • An aluminum brightener is a product that will remove vast amounts of contamination from aluminum and remove the outer most layer of the aluminum. As soon as it meets oxygen again, the protective layer will be re-created again. It will improve the aspect of the aluminum and shorten the amount of time needed to clean it prior to polishing.
  • the bright dip (Chemical Brightening) bath functions by levelling the microscopic roughness of the aluminium surface, thus reducing the amount of light that is scattered and increasing the specularity of the surface.
  • the other two methods to obtain a bright aluminium finish are mechanical polishing and electrochemical polishing. Mechanical polishing produces a flowed amorphous surface under the influence of pressure and local high temperatures which may cause problems for sequential operation. Additionally, the labour cost of such a mechanical treatment is higher than chemical applications. By using e-brightening a high gloss mirror finish can be achieved. However, the initial investment cost of the e-brightening procedure is higher than a chemical version.
  • the phosphoric acid, nitric acid and sulphuric acid based chemical polishing baths are widely used to produce specular finishes on a variety of aluminium alloys used for the automotive, appliance, and architectural trim.
  • the classical bright dip contains nitric acid which increases 1400-800 the surface gloss at geometric angles of 20°- 60° respectively.
  • nitric acid based chemical polishing solutions produce nitrous gases which are highly carcinogenic and environmentally hazardous. Because of that, usage of nitric acid should be eliminated.
  • the nitric acid-free version of brightening baths includes a high amount of (>50% Phosphoric acid). This kind of brightening bath is called a semi-bright chemical brightening bath and the highest gloss that can be achieved is around 500.
  • CN106521507A discloses an aluminum alloy chemical polishing additive, comprising phosphoric acid, sulphuric acid, brightener, inhibitor, complexing agent and water.
  • CN101476126A discloses a chemical polishing liquid composition of aluminum products, wherein said composition is free from nitric acid and takes sulphuric acid and phosphoric acid as basis solution, and additive thereof is composed of aluminum sulphate (or aluminum nitrate), potassium permanganate, sodium nitrate, diphenylamine sulphuric acid sodium salt, tartaric acid, and zinc sulphate.
  • polishing temperature is 110-150 degrees centigrade
  • polishing time is 10-120 S.
  • the invention can ensure free the harm of yellow fume of nitrogen oxide during the treatment process of aluminum material, and further can supply excellent polishing effect for the aluminum material, such that the aluminum material can be provided with mirror brightness and low weightlessness rate.
  • CN107488857A discloses a polishing solution of aluminum product, comprising the following raw materials in terms of parts by weight: 30-65 of phosphoric acid, 55-85 of sulphuric acid, 0.2-2.5 parts of aluminium salt, persulphate 0.05-0.2 parts, 0.04-0.18 parts of sodium silicate, 0.01-0.3 parts of thiourea, dithiodi-propanol 0.05-0.5 parts, ethylenediamine tetramethylene phosphonic acid 0.02-0.2 parts, 0.01-0.1 parts of oil hydroxyethyl imidazoline.
  • the polishing step is as follows: preparing polishing liquid; the polishing liquid is heated to 75 degrees centigrade to 110 degrees centigrade; the drying product to be polished is soaked into the polishing liquid, soaking for 20S to 150S; after taking out the aluminum product, washing by de-ionized water of 50 degrees centigrade; blowing to dry.
  • the polishing solution of the invention uses phosphoric acid, sulphuric acid, aluminum ion, strong oxidizer, corrosion inhibitor and brightener for cooperation, it can effectively avoid the problem of corrosion of aluminum material, and the polishing effect is good, and the efficiency is high.
  • CN108914130A discloses an environment-friendly aluminum product chemical polishing liquid and its preparation method and polishing method; the environment-friendly aluminum product chemical polishing liquid, comprising the following raw materials by weight percentage: 38-52 % of phosphoric acid, sulphuric acid, 5-13 % of aluminum salt, 0.05-0.5 % of organic acid, 3-10 % of polyethylene glycol, 5-15 % of sodium dodecyl sulphate, 1-3 % of thiourea, 0.5-1.5 % of coconut oleic acid diethanolamide 1.0-3.0 %, and the rest is water.
  • the chemical polishing solution does not harm human body in the using process, no air pollution, good aluminum material surface brightness and surface smoothness after polishing, can be industrially produced in large scale.
  • CN110438508A discloses a chemical polishing liquid, wherein it comprises the following materials according to weight parts: 52-60 parts of phosphoric acid, 31-41 of sulphuric acid, 0.21-0.31 parts of copper sulphate, 0.03-0.07 parts of oxalic acid, sodium tungstate, 0.54-0.7 parts of ferric sulphate, 0.13-0.17 parts of titanium, 0.06-0.1 parts of glycol, 1.1-1.5 parts of chemical polishing liquid of the invention is not limited by the product shape, uniformly polishing the surface of aluminum, the same; the aluminum product glossiness after chemical polishing liquid of the present invention processing is high, no flow trace, chemical polishing liquid of the invention when processing the aluminum product has enough detention time, can meet the requirement of automatic production.
  • CN111020590A discloses an environment-friendly aluminum alloy chemical polishing solution, the formulation comprising 25 to 40wt % of organic acid, 30 to 50 wt % of sulfuric acid, 0.15 to 0.5wt % of sulfate. 15 to 20wt % of fluorinecontaining brightener, 0.1 to 0.2wt % of polyethylene glycol 6000, 0.15 to 0.3wt % of fatty acid derivatives, 0.01 to 0.1wt % of corrosion inhibitor, and the rest of de-ionized water.
  • the fatty acid derivative is saponification or esterification products of fatty acid with diethanolamine, triethanolamine, glycerol, isopropanol or sorbitol, and molecular carbon 12-28.
  • the environment-friendly aluminum alloy chemical polishing solution not only environment-friendly, but also can make the plate surface with a high gloss, can solve the swash surface flower, and marks many problems.
  • CN111996533A discloses an environment-friendly aluminum alloy chemical polishing solution and preparation method and polishing method thereof, wherein the chemical polishing solution comprises the following parts by weight: phosphoric 85 % 40- 90 parts, 98 % acid 10-50 parts, ammonium polyphosphate 0.1- 1 parts, nitrate 0.1 ⁇ 2.5 parts, sulphate 0.02 ⁇ 0.07 parts, chloride 0.00003 ⁇ 0.00004 parts.
  • the chemical polishing solution of the invention mainly uses phosphoric acid, sulphuric acid, nitrate, sulphate, chloride, ammonium polyphosphate as auxiliary, realizing the wide phosphorus-sulphur ratio, changing the traditional" three acid " chemical polishing need according to different material aluminum alloy light condition two frequently adjusting polishing liquid phosphorus-sulphur ratio mode, and completely avoiding the risk of " triacid " chemical polishing crystallization, simple operation, improved production efficiency, good polishing effect, the production cost is greatly reduced.
  • a brightening solution for aluminium or aluminium alloys comprising
  • the brightening solution comprises at least one wetting agent.
  • the brightening solution comprises at least one corrosion inhibitor.
  • the brightening solution comprises 0,05 wt.-% to 2 wt.-%, preferably 0,1 wt.-% to 1 wt.-% of the at least one metal ion.
  • the brightening solution comprises 0,001 wt.-% to 1,2 wt.-%, preferably in an amount of 0,005 wt.-% to 0,58 wt.-% of the at least one wetting agent.
  • the brightening solution is comprised from 0,01 to 25,0 wt.-% of phosphoric acid.
  • the weight ratio between the sulphuric acid and the phosphoric acid is from 1,2:1 to 3:1, preferably from 1,5:1 to 2,5:1.
  • the at least one metal ion is iron.
  • the brightening solution comprises 0,001 wt.-% to 2 wt.-%, preferably in an amount of 0,01 wt.-% to 1 wt.-% of at least one corrosion inhibitor.
  • the brightening solution comprises less than 0,1 wt.-% of copper, and preferably the brightening solution is free of copper.
  • a process for brightening an aluminium or aluminium alloy substrate including the following steps:
  • the temperature of the solution is from 50 to 150°C, preferably from 60 to 140°C, more preferably from 80 to 130°C.
  • the duration of step c) is from 1 second to 600 seconds, preferably from 5 seconds to 300 seconds, more preferably from 10 seconds to 200 seconds.
  • the step c) is followed by a deoxidizing step of the substrate.
  • the step c) is followed by a desmutting step of the substrate.
  • step c there is a deoxidizing step of the substrate before step c).
  • step c there is a desmutting step of the substrate before step c).
  • the comparative examples were realized using a solution of 70% of H 3 PO 4 and 20% of H 2 SO 4 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
EP22161155.1A 2022-03-09 2022-03-09 Solution de brillantage pour aluminium ou alliage d'aluminium et procédé de brillantage d'aluminium ou d'alliage d'aluminium Pending EP4242346A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22161155.1A EP4242346A1 (fr) 2022-03-09 2022-03-09 Solution de brillantage pour aluminium ou alliage d'aluminium et procédé de brillantage d'aluminium ou d'alliage d'aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22161155.1A EP4242346A1 (fr) 2022-03-09 2022-03-09 Solution de brillantage pour aluminium ou alliage d'aluminium et procédé de brillantage d'aluminium ou d'alliage d'aluminium

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EP4242346A1 true EP4242346A1 (fr) 2023-09-13

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970529A (en) * 1975-04-30 1976-07-20 Oxy Metal Industries Corporation Electropolishing aluminum and aluminum alloys
GB1582134A (en) * 1977-04-29 1980-12-31 British Aluminium Co Ltd Brightening of aluminium and aluminium alloy surfaces
JP2002285360A (ja) * 2001-03-23 2002-10-03 Mitejima Kagaku Kk 化学研磨液
US20040129574A1 (en) * 2003-01-06 2004-07-08 Sheila Farrokhalaee Kia Color finishing method
CN101476126A (zh) 2009-01-19 2009-07-08 山西大学 一种铝制品化学抛光液及其抛光方法
CN104164671B (zh) * 2014-08-12 2016-05-04 瓮福（集团）有限责任公司 一种铝合金两酸无烟抛光添加剂及制备方法
CN106521507A (zh) 2016-12-09 2017-03-22 江美丽 铝合金化学抛光添加剂
CN107488857A (zh) 2017-09-30 2017-12-19 徐州轩辕铝业有限公司 一种铝制品的抛光液及其抛光方法
CN108914130A (zh) 2018-08-30 2018-11-30 白强 一种环保型铝材抛光液及其制备和抛光方法
CN110438508A (zh) 2018-05-04 2019-11-12 上海澳崎化工科技有限公司 一种化学抛光液及采用该化学抛光液的抛光工艺
CN111020590A (zh) 2019-11-25 2020-04-17 昆山兰博旺新材料技术服务有限公司 环保型铝合金化学抛光液
CN111996533A (zh) 2020-07-23 2020-11-27 黄珊珉 环保型铝合金化学抛光液及其制备方法和抛光方法

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970529A (en) * 1975-04-30 1976-07-20 Oxy Metal Industries Corporation Electropolishing aluminum and aluminum alloys
GB1582134A (en) * 1977-04-29 1980-12-31 British Aluminium Co Ltd Brightening of aluminium and aluminium alloy surfaces
JP2002285360A (ja) * 2001-03-23 2002-10-03 Mitejima Kagaku Kk 化学研磨液
US20040129574A1 (en) * 2003-01-06 2004-07-08 Sheila Farrokhalaee Kia Color finishing method
CN101476126A (zh) 2009-01-19 2009-07-08 山西大学 一种铝制品化学抛光液及其抛光方法
CN104164671B (zh) * 2014-08-12 2016-05-04 瓮福（集团）有限责任公司 一种铝合金两酸无烟抛光添加剂及制备方法
CN106521507A (zh) 2016-12-09 2017-03-22 江美丽 铝合金化学抛光添加剂
CN107488857A (zh) 2017-09-30 2017-12-19 徐州轩辕铝业有限公司 一种铝制品的抛光液及其抛光方法
CN110438508A (zh) 2018-05-04 2019-11-12 上海澳崎化工科技有限公司 一种化学抛光液及采用该化学抛光液的抛光工艺
CN108914130A (zh) 2018-08-30 2018-11-30 白强 一种环保型铝材抛光液及其制备和抛光方法
CN111020590A (zh) 2019-11-25 2020-04-17 昆山兰博旺新材料技术服务有限公司 环保型铝合金化学抛光液
CN111996533A (zh) 2020-07-23 2020-11-27 黄珊珉 环保型铝合金化学抛光液及其制备方法和抛光方法

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