Pretreatment process for electrophoresis coating

An electrophoretic coating and pre-treatment technology, applied in electrolytic coatings, electrophoretic plating, coatings, etc., to achieve the effect of smaller investment, shorter process, and reduced water consumption

Inactive Publication Date: 2010-09-15
SHANDONG KAMA AUTOMOBILE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned existing problems caused by the use of phosphating solution in the existing electrophoretic coating pretreatment process of vehicle frames and cargo boxes, the present invention provides a kind of electrophoretic coating pretreatment process, which can not only reduce costs and improve quality , but also can solve the problem of phosphorus-rich pollution

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  • Pretreatment process for electrophoresis coating
  • Pretreatment process for electrophoresis coating
  • Pretreatment process for electrophoresis coating

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Experimental program
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Effect test

Embodiment 1

[0046]Embodiment 1, the pretreatment process of electrophoretic coating, comprises the following steps: first put the workpiece to be treated in a high-pressure water washing tank for high-pressure water washing; during high-pressure water washing, the temperature of the tank liquid is 35 ° C, and the washing time is 3′05″, free The alkalinity is 5 points, and the spray pressure is 0.35MP. Put the workpiece after washing with water into the degreasing tank for degreasing. During the degreasing process, the temperature of the tank solution is 50°C, the degreasing time is 2′48″, and the free alkalinity At 8:00, put the workpiece after degreasing into the clear water tank for washing. The time for washing is 50″. Put the workpiece after washing into the pickling tank for pickling treatment. , the bath temperature is 55°C, the pickling time is 2'38", and the total acid point is 550 points. Put the workpiece after pickling into the clear water tank for water washing, and the time fo...

Embodiment 2

[0057] Embodiment 2, the pretreatment process of electrophoretic coating, comprises the following steps: first put the workpiece to be treated into a high-pressure water washing tank for high-pressure water washing; during high-pressure water washing, the bath temperature is 40°C, and the washing time is 3′20″, free The alkalinity is 5.5 points, the spray pressure is 0.38MP, and the workpiece after washing is put into the degreasing tank for degreasing. During the degreasing process, the temperature of the tank solution is 55°C, the degreasing time is 3′, and the free alkalinity is 11 point, put the workpiece after degreasing into the clear water tank for water washing, the time for washing is 1′, put the workpiece after water washing into the pickling tank for pickling treatment, during pickling, the tank The liquid temperature is 60°C, the pickling time is 2′50″, and the total acid point is 600 points. Put the workpiece after pickling into the clear water tank for water washi...

Embodiment 3

[0069] Embodiment 3, the pretreatment process of electrophoretic coating, comprises the following steps: first put the workpiece to be treated in a high-pressure water washing tank for high-pressure water washing; during high-pressure water washing, the bath temperature is 45°C, and the washing time is 3′35″, free The alkalinity is 6 points, and the spray pressure is 0.4MP. Put the workpiece after washing with water into the degreasing tank for degreasing. During the degreasing process, the temperature of the tank solution is 60°C, the degreasing time is 3′12″, and the free alkalinity At 14:00, put the workpiece after degreasing into the clear water tank for washing. The washing time is 1′10″. Put the workpiece after washing into the pickling tank for pickling treatment. When washing, the bath temperature is 65°C, the pickling time is 3′2″, and the total acid point is 650 points. Put the workpiece after pickling into the clear water tank for washing, and the washing time is 1′ ...

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Abstract

The invention discloses a treatment process before electrophoretic coating, which includes the following steps: a workpiece to be treated is put into a hyperbaric rinsing bowl for hyperbaric water washing firstly, then the water-washed workpiece is put into a degreasing tank for degreasing, the degreased workpiece is then put into the rinsing bowl again for water washing, then the water-washed workpiece is put into a pickling tank for acid washing treatment, the acid-washed workpiece is put into the rinsing bowl once again for water washing, then the water-washed workpiece is put into a lye tank for neutralizing treatment of surface acid of the workpiece, at last the neutralized workpiece is put into a 704A liquid for film treatment of the workpiece surface. Compared with the phosphating film layer, the treated workpiece film layer by adopting the treatment process has greatly improved binding force and appearance effect after being bended.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to a pre-treatment process for electrophoretic coating of vehicle frames and cargo boxes. Background technique [0002] At present, the phosphating process commonly used in the known electrophoretic coating pretreatment of vehicle frames and cargo boxes contains inorganic phosphorus, which is difficult to neutralize. Therefore, it is one of the phosphorus-rich pollution of the water system caused by discharge, and phosphating is a medium-strong acid that has strong corrosion hazards to equipment. After phosphating treatment, the weld seam returns to acid and rusts, which is caused by the acidity of the phosphating solution contained in the weld seam. Phosphating solution is an acidic corrosive liquid. The phosphating solution before electrophoresis is a medium-strong acid etching process. The corrosive phosphating solution hidden in the pores of the weld cannot be completely w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/20
Inventor 董宜顺孙金龄桑明智桑庆烈陈伟曹怀亮
Owner SHANDONG KAMA AUTOMOBILE MFG
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