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Electrophoresis coating technique for fasteners

An electrophoretic coating and fastener technology, applied in electrolytic coatings, electrophoretic plating, coatings, etc., can solve the problems of high cost, no wear resistance, and no environmental protection, and achieve improved corrosion resistance and suitable friction coefficient. Effect

Inactive Publication Date: 2009-03-18
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the passivation treatment solution of electroplating and Dacromet coating contains C r +6 , not environmentally friendly; the corrosion resistance of ordinary electroplating is about 100 hours, and the corrosion resistance of dacromet coating can reach (500-1000) hours, but the cost is relatively high, and the moisture resistance of the film layer is poor (240 hours of heat and humidity resistance), In addition, it is not wear-resistant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Adopt process plan 1: the friction coefficient of the paint film is suitable, and does not affect product assembly; such as: fasteners for engines, gearboxes, and wheels.

[0028] The process steps are:

[0029] 1. Zinc phosphating: carried out in a phosphating tank,

[0030] Process parameters: temperature 35±5°C, time 3-5 minutes, keep shaking the sample, washing with water, drying at 80-100°C for 20 minutes,

[0031] 2. Cathodic electrophoresis: carried out in the electrophoresis tank, the bath temperature is 30±2°C, the electrophoresis time is 2-3 minutes, the coating voltage is 140-180 volts, washed with water,

[0032] 3. Drying: Dry at 170-180°C for 40 minutes;

Embodiment 2

[0034] Adopt process plan 2: Except for fasteners with strict torque requirements, it will not affect product assembly; such as: fasteners for connecting brackets.

[0035] The process steps are:

[0036] 1. Electrogalvanizing: coating thickness 6-8μm, electroplating solution temperature 10-40℃, electroplating time 2-3 minutes, cathode current density: 0.8-3A / dm 2 ,

[0037] 2. Cathodic electrophoresis: carried out in the electrophoresis tank, the bath temperature is 30±2°C, the electrophoresis time is 2-3 minutes, the coating voltage is 100-140 volts, washed with water,

[0038] 3. Drying: Dry at 170-180°C for 40 minutes;

Embodiment 3

[0040] Process plan 3: It is suitable for fasteners without torque requirements, such as: fasteners for connecting glove boxes inside the cab.

[0041] The process steps are:

[0042] 1. Electrogalvanizing: coating thickness 6-8μm, electroplating solution temperature 10-40℃, electroplating time 2-3 minutes, cathode current density: 0.8-3A / dm 2 .

[0043] 2. Zinc phosphating: carried out in a phosphating tank,

[0044] Process parameters: temperature 35±5°C, time 3-5 minutes, keep shaking the sample, washing with water, drying at 80-100°C for 20 minutes.

[0045] 3. Cathodic electrophoresis: carried out in the electrophoresis tank, the bath temperature is 30±2°C, the electrophoresis time is 2-3 minutes, the coating voltage is 140-180 volts, washed with water,

[0046] 4. Drying: Dry at 170-180°C for 40 minutes.

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Abstract

The present invention discloses a process for electrophoretic painting of a fastener, which comprises the following; firstly, a step of phosphatization of zinc series, in which the phosphatization is carried out in a phosphatization tank at a temperature of between 30 and 40 DEG C for 3 to 5 minutes, and the sample piece is subjected to ceaseless shaking, washing, drying for 20 minutes at a temperature between 80 and 100 DEG C; secondly, a step of cathodic electrophoresis, in which the cathodic electrophoresis is carried out in an electrophoresis tank, the tank liquid temperature is between 28 and 32 DEG C, the electrophoresis time is between 2 and 3 minutes and the painting voltage is between 140 and 180 volt, and water washing is adopted; thirdly, a step of drying, in which the surface is dried for 40 minutes at a temperature of between 170 and 180 DEG C. The process solves the problem of processing main Cr6+ pollution in the most universal fastener surface treatment (zinc plating+passivation process, Dacro coating process, darkening process, and the like). The cathodic electrophoretic painting process adopted by the fastener is a novel technology, which improves the corrosion resistance of the fastener and has capacity of protecting environment as well. The composite cost of the process is lower than that of the barrel plating.

Description

technical field [0001] The invention belongs to the technical field of fastener electrophoresis technology, and in particular relates to a fastener electrophoresis coating technology. Background technique [0002] At present, the surface treatment of fasteners on automobiles mainly includes blackening, electroplating (galvanized, zinc-nickel alloy, decorative chrome) Dacromet coating, etc. As we all know, the passivation treatment solution of electroplating and Dacromet coating contains C r +6 , not environmentally friendly; the corrosion resistance of ordinary electroplating is about 100 hours, and the corrosion resistance of Dacromet coating can reach (500-1000) hours, but the cost is relatively high, and the moisture resistance of the film layer is poor (240 hours of heat and humidity resistance), In addition, it is not wear-resistant. Contents of the invention [0003] The object of the present invention is to provide an electrophoretic coating process for fasteners...

Claims

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Application Information

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IPC IPC(8): C25D13/00C25D13/20
Inventor 吴涛宋华高成勇贾立民魏晓川庞虹
Owner CHINA FIRST AUTOMOBILE
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