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Trivalent chromium-conversion processing solution containing aluminum-modified colloidal silica

一种胶态氧化硅、转化处理的技术，应用在氧化硅、二氧化硅、防腐涂料等方向，能够解决不利影响等问题

Inactive Publication Date: 2015-02-04
DISPOL CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in recent years, studies have pointed out that hexavalent chromium will cause adverse effects on the human body and the environment, so the use of hexavalent chromium has been restricted.

Method used

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  • Trivalent chromium-conversion processing solution containing aluminum-modified colloidal silica

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Experimental program
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Effect test

Embodiment 1

[0023]The bolts obtained by zincate Zn plating with a thickness of 8 μm obtained by using the NZ-100 plating solution produced by Deepsol Co., Ltd. were immersed in the following trivalent chromium conversion treatment solution (put the bolts into a basket made of stainless steel stirring in). The treatment temperature was 35° C., and the treatment time was 40 seconds.

[0024] A trivalent chromium conversion treatment liquid was prepared by adding LUDOX AM produced by DuPont of the United States as colloidal silica in an amount of 30 g / L to 70 mL / L of ZT-444CS produced by Deepsol Co., Ltd. The pH of the treatment solution was adjusted to pH 2.7 with NaOH.

Embodiment 2

[0026] The bolts obtained by zincate Zn plating with a thickness of 8 μm obtained by using the NZ-110 plating solution produced by Deepsol Co., Ltd. were immersed in the following trivalent chromium conversion treatment solution (put the bolts into a basket made of stainless steel stirring in). The treatment temperature was 30° C., and the treatment time was 25 seconds.

[0027] Preparation of trivalent chromium conversion treatment by adding SNOWTEX CXS produced by Nissan Chemical Industries Co., Ltd. as colloidal silica to 100 mL / L of ZT-444A produced by Deepsol Co., Ltd. liquid. The pH of the treatment solution was adjusted to pH 3.0 with NaOH.

Embodiment 3

[0029] Immerse the bolts obtained by using the NZ-200 plating solution produced by Deepsol Co., Ltd. to obtain a zincate Zn coating with a thickness of 8 μm in the following trivalent chromium conversion treatment solution (put the bolts into a basket made of stainless steel stirring in). The treatment temperature was 30° C., and the treatment time was 40 seconds.

[0030] Trivalent chromium conversion treatment was prepared by adding SILICADOL 20AL produced by Nippon Chemical Industry Co., Ltd. as colloidal silica to 75 mL / L of ZT-444DSM1 produced by Deepsol Co., Ltd. liquid. The pH of the treatment solution was adjusted to pH 2.5 with NaOH.

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Abstract

The present invention provides a trivalent chromium-conversion processing solution characterized by containing aluminum-modified colloidal silica.

Description

technical field [0001] The invention relates to a trivalent chromium conversion treatment solution for forming a corrosion-resistant trivalent chromium conversion treatment layer on a metal surface, especially a zinc or zinc alloy coating, and is used to form a trivalent chromium conversion treatment on a zinc or zinc alloy coating Method for treating layer and trivalent chromium conversion treating layer formed on zinc or zinc alloy coating. Background technique [0002] Methods for preventing metal surface corrosion include methods such as electroplating zinc or zinc alloys, etc. However, the corrosion resistance obtained by electroplating alone is not enough, and in the industry, chromic acid treatment containing hexavalent chromium after electroplating is widely used, that is, So-called chromate chrome plating. However, in recent years, studies have pointed out that hexavalent chromium will cause adverse effects on the human body and the environment, so the use of hexav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53C23C22/30
CPCC23C22/53C23C2222/10C01B33/18C08K3/08C08K3/36C09D5/08C23C22/30
Inventor 山口慎司
Owner DISPOL CHEMICALS CO LTD
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