Rustproofing agent for zinc plated steel sheet

a technology of zinc plated steel and rustproofing agent, which is applied in the direction of solid-state diffusion coating, coating, metallic material coating process, etc., can solve the problems of affecting the environment and humans, the level of corrosion resistance cannot be considered adequate, and the difficulty of white rust over less than 3% of the surface area

Inactive Publication Date: 2004-09-09
HENKEL KGAA
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  • Application Information

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Problems solved by technology

However, this chromating involves the use of hexavalent chromium, which is harmful to both the environment and humans.
Moreover, this level of corrosion resistance can hardly be considered adequate, and it is difficult to achieve a level at which white rust occurs over less than 3% of the surface area after 120 hours of saltwater spray.
With this method, the solution still contains hexavalent chromium, albeit very little, and the resulting corrosion resistance does not even reach the level of temporary rustproofing.
The level of corrosion resistance will be unacceptable if the weight ratio of chromium in component A with respect to a total solids content of 100 wt % in the rustproofing agent is either less than 1 wt % or over 30 wt %.
Examples of metal salts other than a nitric acid metal salt include sulfuric acid metal salts and metal halides, but since it is

Method used

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Embodiment Construction

[0024] The present invention will now be described in specific terms through examples and comparative examples. These examples are only given for the purpose of describing the present invention, and do not serve to limit the present invention in any way.

[0025] Production of Test Sheet

[0026] (1) Test Materials

[0027] The following commercially available materials were used as test materials.

[0028] Electrogalvanized steel sheet (EG)

[0029] thickness: 0.8 mm, plating basis weight: 20 / 20 (g / m.sup.2)

[0030] Hot galvanized steel sheet (GI)

[0031] thickness: 0.8 mm, plating basis weight: 60 / 60 (g / m.sup.2)

[0032] 5% aluminum-containing hot galvanized steel sheet (GF)

[0033] thickness: 0.8 mm, plating basis weight: 90 / 90 (g / m.sup.2)

[0034] (2) Degreasing

[0035] Each of the above test materials was degreased with a silicate-based alkali degreaser called FINE CLEANER 4336 (trade name of Nihon Parkerizing) (concentration: 20 g / L, temperature: 60.degree. C., 20 seconds of spraying), after which the mate...

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Abstract

A rustproofing agent for a zinc plated steel sheet is provided which contains (A) a chromium aqueous solution containing an organic substance and (B) an acid metal such as a metal salt of nitric acid or phosphoric acid. All of the chromium in the chromium aqueous solution of component. A is trivalent chromium. It is preferable if the organic substance in component A contains at least one type of oxy acid or oxide thereof. The metal in the acid metal salt of component B is an alkaline earth metal, cobalt, nickel, iron, zirconium, titanium, etc. It is also preferable if (C) a water-dispersible silica is contained as an additional component. The present invention also provides a zinc plated steel sheet, in which at least one side of the surface of a zinc plated steel sheet is coated with the zinc plated steel sheet rustproofing agent and the rustproofing agent dried to form a coating with a dry coating weight of 0.01 to 3 g/m<2>.

Description

[0001] The present invention relates to a rustproofing agent for zinc plated steel sheet, which contains no hexavalent chromium (a hazardous substance) whatsoever, and has excellent corrosion resistance, fingerprint resistance, and blackening resistance. The invention also relates to a zinc plated steel sheet that has undergone a rustproofing treatment with this agent.DISCUSSION OF THE RELATED ART[0002] Steel sheets used in the fabrication of consumer electrical products and for construction materials are often subjected to a chromating treatment for the purpose of improving the corrosion resistance of the surface of zinc plated steel sheets. However, this chromating involves the use of hexavalent chromium, which is harmful to both the environment and humans. Consequently, there has been an urgent need in recent years for a chemical conversion treatment that does not make use of hexavalent chromium, and even for a chemical conversion treatment that does not involve the use of chromi...

Claims

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Application Information

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IPC IPC(8): C23C22/53C23C22/74
CPCC23C22/53C23C2222/10C23C22/74
Inventor KINOSHITA, YASUHIROKUMAGAI, MANABUKOZAKI, TAKUMI
Owner HENKEL KGAA
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