WO1997003227A1 - Surface treatment of products made of aluminium and aluminium alloys - Google Patents

Surface treatment of products made of aluminium and aluminium alloys Download PDF

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Publication number
WO1997003227A1
WO1997003227A1 PCT/CZ1996/000017 CZ9600017W WO9703227A1 WO 1997003227 A1 WO1997003227 A1 WO 1997003227A1 CZ 9600017 W CZ9600017 W CZ 9600017W WO 9703227 A1 WO9703227 A1 WO 9703227A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminium
products
treated
treatment
surface treatment
Prior art date
Application number
PCT/CZ1996/000017
Other languages
French (fr)
Inventor
Stefan Kalinic
Original Assignee
Kalinic Praha Spol. S.R.O.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kalinic Praha Spol. S.R.O. filed Critical Kalinic Praha Spol. S.R.O.
Priority to AU62974/96A priority Critical patent/AU6297496A/en
Publication of WO1997003227A1 publication Critical patent/WO1997003227A1/en

Links

Classifications

    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/56—Treatment of aluminium or alloys based thereon
    • 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
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium

Definitions

  • the invention concerns a method of surface treatment of products made of aluminium and aluminium alloys, in particular with respect to assuring good adhesion of coating systems - lacquers.
  • the -surface of aluminium and aluminium alloys must be chemically treated.
  • Several different treatment methods are normally used, such as electrolytic oxidation or chromate surface treatment.
  • Electrolytic oxidation of aluminium is performed in a water solution of acid on the plate where the metal is partially dissolved and covered with an insoluble layer of non-metal character, consisting of hydrated aluminium oxides.
  • This layer does not conduct electricity, it is hard and adhere well to the base material. This layer also resists normal corrosion and abrasive wear.
  • Main groups are based on methods using sulfuric, oxalic and monochromic acid. Electrolytic oxidation is an effective treatment, however, it is very demanding for energy and time, especially when surface of larger products needs to be treated.
  • the chromate surface treatment is essentially passivating in monochromic acid or solutions of chromate, usually potassium chromate, which improves protection against atmospheric corrosion.
  • the disadvantage of the chromate surface treatment is the necessity to use expensive chrome compounds which contaminate the environment. Using such compounds means increased demands both for the production technology and its operation.
  • the shortcomings described above are substantially improved by a surface treatment of products made of aluminium and aluminium alloys according to this invention.
  • the invention is based on the following procedure. Products are treated with a solution of sodium hydroxide, concentration from 8% to 10% and temperature from 40°C to 55°C for 10 to 15 minutes. Subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
  • products are treated with a 10% solution of sodium hydroxide at a temperature of 40°C for 10 minutes. Subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
  • Treated products need to be rinsed between individual reactions. Treatment with sodium hydroxide dissolves the material surface which results in widening its physical-chemical grid. This also mean that the ability of the surface to bind to other materials improves.
  • the procedure according to this invention is more advantageous with respect to energy consumption and demand for time, especially in treating larger products. Contrary to the chromate surface treatment, the procedure according to this invention uses less demanding chemical compounds which are less harmful to the environment. The invention decreases demands both for the production technology and its operation.
  • the created protective layer does not contain fragile elements, such as chromate or eloxal coating, and therefore it is not sensitive to under-coat corrosion. This is especially advantageous with respect to durability of the coating - lacquer.
  • the surface treatment of products made of aluminium and aluminium alloys may be used especially in the construction industry as well as in the light industry and jewelry production.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

The invention concerns treatment of products made of aluminium and aluminium alloys. Products are treated with a solution of sodium hydroxide, concentration from 8 % to 10 % and temperature from 40 °C to 55 °C, for 10 to 15 minutes. Subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.

Description

Surface treatment of products made of aluminium and aluminium alloys.
Technical field
The invention concerns a method of surface treatment of products made of aluminium and aluminium alloys, in particular with respect to assuring good adhesion of coating systems - lacquers.
Background of the invention
To attain good adhesion of coating systems - lacquers, the -surface of aluminium and aluminium alloys must be chemically treated. Several different treatment methods are normally used, such as electrolytic oxidation or chromate surface treatment.
Electrolytic oxidation of aluminium, so-called elox treatment, is performed in a water solution of acid on the plate where the metal is partially dissolved and covered with an insoluble layer of non-metal character, consisting of hydrated aluminium oxides. This layer does not conduct electricity, it is hard and adhere well to the base material. This layer also resists normal corrosion and abrasive wear. There are a number of various methods based on this procedure. They differ mainly in the composition of the oxidation bath. Main groups are based on methods using sulfuric, oxalic and monochromic acid. Electrolytic oxidation is an effective treatment, however, it is very demanding for energy and time, especially when surface of larger products needs to be treated. The chromate surface treatment is essentially passivating in monochromic acid or solutions of chromate, usually potassium chromate, which improves protection against atmospheric corrosion. The disadvantage of the chromate surface treatment is the necessity to use expensive chrome compounds which contaminate the environment. Using such compounds means increased demands both for the production technology and its operation.
Sumarv of the invention
The shortcomings described above are substantially improved by a surface treatment of products made of aluminium and aluminium alloys according to this invention. The invention is based on the following procedure. Products are treated with a solution of sodium hydroxide, concentration from 8% to 10% and temperature from 40°C to 55°C for 10 to 15 minutes. Subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
In optimal conditions, products are treated with a 10% solution of sodium hydroxide at a temperature of 40°C for 10 minutes. Subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
Treated products need to be rinsed between individual reactions. Treatment with sodium hydroxide dissolves the material surface which results in widening its physical-chemical grid. This also mean that the ability of the surface to bind to other materials improves. In comparison to electrolytic oxidation, the procedure according to this invention is more advantageous with respect to energy consumption and demand for time, especially in treating larger products. Contrary to the chromate surface treatment, the procedure according to this invention uses less demanding chemical compounds which are less harmful to the environment. The invention decreases demands both for the production technology and its operation. The created protective layer does not contain fragile elements, such as chromate or eloxal coating, and therefore it is not sensitive to under-coat corrosion. This is especially advantageous with respect to durability of the coating - lacquer.
Detailed description of the preffered embodiments
The invention and its advantages will be explained in detail on a specific example of treatment of a product made of aluminium and aluminium alloys. The product was treated with 10% sodium hydroxide at a temperature of 45°C for 10 minutes. After a surface structure similar to the structure of chromate surface was created, the product was thoroughly rinsed and treated with nitric acid to oxidize the remaining alloyed elements. Subsequently, the product was again thoroughly rinsed and passivated in order to stabilize the surface layer with sulfuric acid. The treatment with sodium hydroxide caused dissolving of the product surface which resulted in widening its physical-chemical grid. This also increased the ability of the surface to bind to other components. Industrial applicability
The surface treatment of products made of aluminium and aluminium alloys may be used especially in the construction industry as well as in the light industry and jewelry production.
Ve claim:

Claims

C L A I M S
1. Sur ace treatment of products made of aluminium and aluminium alloys c h a r a c t e r i z e d b y a treatment with a solution of sodium hydroxide, concentration from 8% to 10% and temperature from 40°C to 55°C for 10 to 15 minutes, subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
2. Surface treatment of products made of aluminium and aluminium alloys according to claim 1 c h a r a c t e ¬ r i z e d b y a treatment with a 10% solution of sodium hydroxide at a temperature of 45°C for 10 minutes, subsequently, products are treated with nitric acid and finally passivated with sulfuric acid.
PCT/CZ1996/000017 1995-07-13 1996-07-11 Surface treatment of products made of aluminium and aluminium alloys WO1997003227A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62974/96A AU6297496A (en) 1995-07-13 1996-07-11 Surface treatment of products made of aluminium and aluminium alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ951820A CZ182095A3 (en) 1995-07-13 1995-07-13 Surface treatment process of products made of aluminium and alloys thereof
CZPV1820-95 1995-07-13

Publications (1)

Publication Number Publication Date
WO1997003227A1 true WO1997003227A1 (en) 1997-01-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CZ1996/000017 WO1997003227A1 (en) 1995-07-13 1996-07-11 Surface treatment of products made of aluminium and aluminium alloys

Country Status (3)

Country Link
AU (1) AU6297496A (en)
CZ (1) CZ182095A3 (en)
WO (1) WO1997003227A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100501310B1 (en) * 2002-10-30 2005-07-18 최용태 A scissors

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137988A (en) * 1936-10-21 1938-11-22 Heresite & Chemical Company Adherent aluminum compound
FR1480356A (en) * 1966-03-31 1967-05-12 Diversey France New deoxidizing-neutralizing composition for the treatment of aluminum alloys
US3692583A (en) * 1971-03-01 1972-09-19 Fmc Corp Desmutting etched aluminum alloys
JPS5035033A (en) * 1973-08-02 1975-04-03
FR2395304A1 (en) * 1977-06-24 1979-01-19 Polychrome Corp AGENT FOR THE ELIMINATION OF DEPOSITS OF METALLIC OXIDES AND HYDROXIDES FROM THE SURFACE OF ALUMINUM SHEETS OR ALUMINUM ALLOYS
JPS61258255A (en) * 1985-05-13 1986-11-15 Fuji Photo Film Co Ltd Positive type photosensitive lithographic printing plate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137988A (en) * 1936-10-21 1938-11-22 Heresite & Chemical Company Adherent aluminum compound
FR1480356A (en) * 1966-03-31 1967-05-12 Diversey France New deoxidizing-neutralizing composition for the treatment of aluminum alloys
US3692583A (en) * 1971-03-01 1972-09-19 Fmc Corp Desmutting etched aluminum alloys
JPS5035033A (en) * 1973-08-02 1975-04-03
FR2395304A1 (en) * 1977-06-24 1979-01-19 Polychrome Corp AGENT FOR THE ELIMINATION OF DEPOSITS OF METALLIC OXIDES AND HYDROXIDES FROM THE SURFACE OF ALUMINUM SHEETS OR ALUMINUM ALLOYS
JPS61258255A (en) * 1985-05-13 1986-11-15 Fuji Photo Film Co Ltd Positive type photosensitive lithographic printing plate

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7542, Derwent World Patents Index; Class M12, AN 75-69627W, XP002018287 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 109 (P - 564) 7 April 1987 (1987-04-07) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100501310B1 (en) * 2002-10-30 2005-07-18 최용태 A scissors

Also Published As

Publication number Publication date
AU6297496A (en) 1997-02-10
CZ182095A3 (en) 1997-04-16

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