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Treating solution for surface treatment of metal and a method for surface treatment

a surface treatment and metal technology, applied in the direction of electrolytic inorganic material coating, solid-state diffusion coating, coating, etc., can solve the problems of material which cannot be treated, and not being able to achieve sufficient corrosion resistance after coating, etc., to achieve excellent corrosion resistance and excellent corrosion resistance

Inactive Publication Date: 2006-08-24
NIHON PARKERIZING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a treating solution for surface treatment of metal materials that form a surface treated film with excellent corrosion resistance. The solution does not contain harmful components to the environment and does not generate sludge. The solution can be used for surface treatment of metal materials simultaneously, and the surface treated film has uniform components. The solution contains a compound of zirconium or titanium, and free fluorine ion. It can also contain calcium, magnesium, or strontium compounds, or polymer compounds. The method for surface treatment involves contacting the metal material with the treating solution and then optionally further treating it with an acidic aqueous solution of compounds containing the elements of cobalt, nickel, tin, copper, titanium, or zirconium, or with a polymer compound or surface active agent. The metal material can also be treated with an electrolytic process. The solution can be used for surface treatment of metal materials that have not been degreased and cleaned. The surface treated film has good adhesion to the metal material.

Problems solved by technology

However, in the zinc phosphate treatment, the generation of sludge, which is the byproduct of the reaction can not be avoided, and depending on the kind of aluminum alloy, the sufficient corrosion resistance after coated can not be obtained.
However, in the case of the method, the metal material which can be treated is limited to aluminum alloys only, and, it is difficult to be applied to a structural construction having complex structure such as car body, because the surface treated film is formed by coating and drying.
However, in any of these methods, the metal material which can be treated is limited to the aluminum alloy only, originally having excellent corrosion resistance; these methods may not deposit a surface treated film on the surface of ferriferous material or zinciferous material.
However, by this method, it is difficult to form a surface treated film on a surface of ferriferous material such as cold rolled steel, and is not possible to treat ferriferous material at the same time.
However, similarly to the invention disclosed in above mentioned JP 2000-204485 A, since the film is formed by coating and drying, it is difficult to form a uniform film on the surface of a structural construction having complex structure such as car body.
As mentioned above, according to the prior arts, it was impossible to perform surface treatment excellent in corrosion resistance and adhesion on car body and the like composed of two to four metal materials of ferriferous material such as cold rolled steel plate, zinciferous material such as zinc plated steel plate, aluminiferous material and magnesiferous material simultaneously with a treating solution containing no harmful component to the environment and not generating waste sludge.

Method used

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Examples

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examples

[0045] The effects of the treating solution for surface treatment of metal and the method for surface treatment of the present invention will be illustrated specifically in accordance with the Examples and Comparative Examples below. And a material to be treated, a degreasing agent and a coating used therein are arbitrarily selected from the materials which are on the market, and not intending to restrict the actual uses of the treating solution for surface treatment of metal and the method for surface treatment of the present invention.

[Test Plate]

[0046] As the test plates, cold rolled steel plates, hot-dip zinc-coated steel plates, aluminum alloy plates and magnesium alloy plates are used in the Examples and Comparative Examples. The abbreviations and specifications of these test plates are shown below. For the evaluation of the appearance after surface treatment, the test plate prepared by joining three metal materials of SPC, GA and Al by a spot welding was used. For the evalu...

examples 1-4 , example 7

Examples 1-4, Example 7 and Comparative Examples 1-4: alkali degreasing→rinsing by water→film forming treatment→rinsing by water→rinsing by pure water→drying

Example 5: alkali degreasing→rinsing by water→electrolysis formation treatment→rinsing by water→rinsing by Pure water→drying

Example 6: film formation treatment (used both as degreasing)→rinsing by water→rinsing by pure water→drying

Example 8: alkali degreasing→rinsing by water→film formation treatments→rinsing by water→after treatment→rinsing by pure water→drying

Example 9: film formation treatment (and degreasing)→rinsing by water→after treatment→rinsing by pure water →drying

Comparative Example 5: alkali degreasing→rinsing by water→surface conditioning→zinc phosphate treatment→rinsing by water→rinsing by pure water→drying

[0052] In above mentioned processes for Examples and Comparative Examples, alkali degreasing was carried out as follows. That is, Fine Cleaner L4460 (Trade Mark: Product of Nihon Parkerizing) was dilute...

example 1

[0053] Aqueous solution of zirconium with concentration of 200 ppm was prepared using zirconium oxynitrate reagent and nitric acid. After heating the aqueous solution to 45° C., the pH was adjusted to 3.0 using sodium hydroxide reagent and hydrofluoric acid, and the concentration of free fluorine ion measured by a fluorine ion meter (IM-55G; product of Toa Denpa Industries Co., Ltd) was adjusted to 1 ppm, thus obtaining the treating solution for surface treatment of metal. The total fluorine concentration in the treating solution for surface treatment of metal after adjusting free fluorine ion was 50 ppm.

[0054] The test plate rinsed by water after degreasing was immersed into the treating solution for surface treatment of metal for 120 seconds so as to carry out the surface treatment.

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Abstract

Treating solution for surface treatment of metal to treat one metal material selected from the group consisting of ferriferous material, zinciferous material, aluminiferous material and magnesiferous material or to treat two or more metal materials selected from the group consisting of ferriferous material, zinciferous material, aluminiferous material and magnesiferous material at the same time, wherein the aqueous surface treating solution contains from 5 to 5000 ppm of at least one compound selected from the group consisting of zirconium compound and titanium compound by the metal element, and from 0.1 to 100 ppm of free fluorine ion, further the pH of the treating solution is from 2 to 6. To the treating solution, calcium compound, magnesium compound, strontium compound, nitric acid group, oxygen acid and / or salt of oxygen acid, polymer compound and surface active agent can be added.

Description

TECHNICAL FIELD [0001] The present invention relates to the treating solution for surface treatment of metal which may deposit a surface treated film having excellent corrosion resistance after being coated on the surface of a metal material of a structural construction such as car body consisting of a single material or two to four materials selected from the group consisting of ferriferous material, zinciferous material, aluminiferous material and magnesiferous material independently or simultaneously. BACKGROUND ART [0002] As the method to form on metal surface a surface treated film having excellent corrosion resistance after coated, a zinc phosphate treatment and a chromate treatment are currently used as ordinary methods. According to the zinc phosphate treatment, it is possible to deposit a film having excellent corrosion resistance on the surface of steel such as cold rolled steel plate, zinc plated steel plate and some of aluminum alloys. However, in the zinc phosphate trea...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C22/34C23C22/40C23C22/44C25D11/08C23C22/66C23C22/72C23C22/83C25D9/08C25D11/30C25D11/34
CPCC23C22/34C25D9/08C23C22/83C23C22/44C23C22/76
Inventor NAKAYAMA, TAKAOMISATO, HIROYUKIAISHIMA, TOSHIYUKIOKADA, EISAKUYOSHIDA, FUMIYASHIOTA, KATSUHIRO
Owner NIHON PARKERIZING
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