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Agent for reducing coating film overall friction coefficient for trivalent chromate treating solution, trivalent chromate treating solution and method for production thereof, and trivalent chromate co

A technology of trivalent chromate and treatment solution, applied in the direction of metal material coating process, etc., to achieve the effect of safe fastening strength, excellent corrosion resistance, and maintaining productivity

Inactive Publication Date: 2007-04-18
DISPOL CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, conversion coatings obtained by one-step trivalent chromate treatment generally result in a higher overall coefficient of friction than conventional hexavalent chromate conversion coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 18

[0067] Zinc (zincate bath (NZ-87, available from Dipsol Chemicals Co., Ltd.), cyanide bath (L-800, available from Dipsol Chemicals Co., Ltd.), chloride M6 bolts (S45C material, strength division 8.8) in a bath (EZ-988, available from Dipsol Chemicals Co., Ltd.) were immersed in trivalent chromic acid having the compositions shown in Tables 1 and 2 below Salt treatment solution, then rinse with water.

[0068] Example number

[0069] Example number

[0070] In Tables 1 and 2, the Cr 3+ Source is CrCl 3 (in Examples 1, 3, 5, 8, 10, 15 and 18) and Cr(NO 3 ) 3 (in Examples 2, 4, 6, 7, 9, 11 to 14, 16 and 17); the oxalic acid used was dihydrate; the Co source used was Co(NO 3 ) 2 . In addition, the Si source used is silica gel; the V source used is VOSO 4 ; The Ni source used was NiSO 4 . Further, the NO used 3 - Source is HNO 3 (in Examples 2, 3, 4, 9 to 11, 14, 15 and 18) and NaNO 3 (in Examples 1, 5 to 7, 12, 13, 16 and 17). Further, the Cl used...

Embodiment 19 to 22

[0072] Alkaline Zn-Ni alloys ((IZ-262 (Ni: 7%), available from Dipsol Chemicals Co., Ltd., IZ-252 (Ni: 14%), available from Dipsol Chemicals Co., Ltd., each plated with a thickness of 8 μm, were M6 bolts (S45C material, strength scale 8.8) obtained from Chemicals Co., Ltd.)) were dipped in a trivalent chromate treatment solution having the composition shown in Table 3 below, and then washed with water.

[0073] Example number

[0074] In Table 3, the Cr 3+ The source is Cr(NO 3 ) 3 (in Examples 15 and 17) and CrCl 3 (in Examples 16 and 18); the oxalic acid used was dihydrate; the Co source used was Co(NO 3 ) 2 . Furthermore, the Si source used was silica gel; the Ni source used was NiSO 4 . Further, NO 3 - Source is NaNO 3 ;Cl used - The source is NaCl; the PO used 4 - Source is NaH 2 PO 4 . The balance of each treatment solution was water. In addition, the pH of each solution was adjusted using NaOH.

Embodiment 23

[0100] When the conversion coating was formed on the bolts using the trivalent chromate treatment solution of Example 1, the resulting overflow was transferred to a backup tank. The pumping speed is 800L / hour. Next, quinallidinic acid was added to the treatment solution in the spare tank so that its concentration in the treatment solution was 8 g / L, and then the resulting treatment solution was returned through a filter (K-05, available from Kizai Company) into the treatment tank. Therefore, the concentration of quinaldicic acid in the treatment solution present in the treatment tank can be kept constant.

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PUM

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Abstract

An agent for reducing a coating film overall friction coefficient for a trivalent chromate treating solution, characterized in that it comprises a quinoline based compound or a derivative thereof. A coating film formed by the contact of a zinc or zinc alloy plating with the trivalent chromate treating solution containing no hexavalent chromium and containing the above agent on the surface of the plating exhibits a corrosion resistance equivalent to that of a coating film formed by a chromate treatment with a treating solution having a conventional hexavalent chromium as a main component, and also exhibits an overall friction coefficient equivalent to or less than that of a coating film formed by a conventional hexavalent chromate.

Description

technical field [0001] The present invention relates to a technique for reducing the overall coefficient of friction of a hexavalent chromium-free and corrosion-resistant trivalent chromate conversion coating on a zinc or zinc alloy plating layer where fastening ability is required. More specifically, the present invention relates to an agent for reducing the overall coefficient of friction of a conversion coating of a trivalent chromate treatment solution, a trivalent chromate treatment solution for reducing the overall coefficient of friction of a trivalent chromate conversion coating And its preparation method, and the trivalent chromate conversion coating with reduced total friction coefficient and its preparation method. Background technique [0002] As a method for preventing rusting of metal surfaces, chromate treatment containing hexavalent chromium on zinc or zinc alloy plating has been used in this industrial field. In recent years, increased control of substances...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47C23C22/13C23C22/17C23C22/18C23C22/20C23C22/53C23C22/42
CPCC23C22/47C23C22/17C23C22/46C23C22/53C23C2222/10C23F11/149
Inventor 山本富孝吉田道正岛宗乡司
Owner DISPOL CHEMICALS CO LTD
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