Surface treatment composition

A composition and pretreatment technology, applied in metal material coating process, anti-corrosion coating, electrolytic organic material coating, etc., can solve the problems of unsatisfactory appearance and durability of electrocoating, insufficient corrosion resistance, etc., and achieve Improved detergent resistance, enhanced uniformity effects

Active Publication Date: 2018-05-01
ATOTECH DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Corrosion resistance is insufficient when metal-based surfaces, especially ferrous metal surfaces, are treated by one of the aforementioned methods
In particular, when the surface is treated with the aforementioned solution before applying the electrocoat, the appearance and durability of the electrocoat are unsatisfactory

Method used

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  • Surface treatment composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Solution B (step ii.) - acidic aqueous composition according to the invention

[0064] (NH 4 ) 2 ZrF 6 5.0g / L in water

[0065] Cr(NO 3 ) 3 9H 2 O 3.5g / L in water (8.75mmol / L Cr(III) ion)

Embodiment 2

[0066] Example 2: Solution C (step ii.) - trivalent chromium chloride (comparative)

[0067] (NH 4 ) 2 ZrF 6 5.0g / L in water

[0068] CrCl 3 ·6H 2 O 2.3g / L in water (8.75mmol / L Cr(III) ion)

Embodiment 3

[0069] Example 3: Solution D (step ii.) - trivalent chromium sulfate (comparative)

[0070] (NH 4 ) 2 ZrF 6 5.0g / L in water

[0071] Cr 2 (SO 4 ) 3 h 2 O 3.5g / L in water (8.75mmol / L Cr(III) ion)

[0072] After the substrates had been treated with the above solutions according to Table 1, they were subsequently painted with commercially available organic paints of the acrylic type (electrocoating used in the white goods industry). Corrosion resistance and detergent immersion resistance were tested using ASTM B117 (version 11 2011) and ASTM D2248 (version 01a 2007), respectively. Unless otherwise specified, experimental conditions are recommended according to ASTM specifications. For ASTM D2248, choose a detergent solution according to No. 7.2.

[0073] Painted panels were scored according to ASTM 1654 (version-052005) prior to testing. Scribe failure ratings are measured in accordance with Section 7 and Table 1 of D1654-05.

[0074] Table 2: Measurement: ASTM D1654...

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Abstract

The present invention relates to an acidic aqueous composition for treating of zirconium-pretreated metal-based substrate surfaces such as steel metals or aluminium surfaces, a process for treating the substrate surfaces with the composition and the use of the composition as post-treatment of zirconium- pretreated metal-based substrate surfaces for subsequent electrocoating of the surfaces to increase corrosion resistance of said metal-based surfaces prior to electro-coating (e-coat) applications and increases detergent and chemical resistance of treated surfaces used in the white goods industry. The acidic aqueous composition comprising a. trivalent chromium ions; b. hexafluorozirconate ions; characterized in that the source of trivalent chromium ions is a trivalent chromium nitrate salt.

Description

technical field [0001] The present invention relates to an acidic aqueous composition for treating zirconium-pretreated metal-based substrate surfaces, such as steel metal or aluminum surfaces, a method of treating substrate surfaces with said composition, and said combination The use of a material as a post-treatment of the surface of a zirconium-pretreated metal-based substrate in preparation for subsequent electrocoating of the surface. [0002] The method is particularly suitable for increasing the corrosion resistance of said metal-based surfaces used in the white goods industry prior to electro-coating (e-coat) application. The method also increases the detergent and chemical resistance of the treated surface. Background technique [0003] A variety of different methods of treating metal-based surfaces, particularly aluminum surfaces, are known in the art. [0004] WO 03 / 040437 A1 relates to a composition for post-treatment of anodized aluminum and aluminum alloys to...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C23C22/34C23C22/80C23C22/83C09D5/08
CPCC09D5/084C23C22/34C23C22/80C23C22/83C23C2222/10C23C22/73C25D9/02
Inventor阿格尼丝·鲁索斯蒂芬·泰勒
OwnerATOTECH DEUT GMBH