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Anti-corrosion technology for metal sheet hollow cavity of car body

A metal sheet and plate technology, applied in electrolytic coatings, electrophoretic plating, coatings, etc., can solve problems such as perforation and corrosion resistance of automobile bodies, improve perforation corrosion resistance, reduce coating consumption, and reduce coating costs. Effect

Inactive Publication Date: 2009-11-11
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of electrophoretic paint penetration, the paint film on some cavity parts of the car body is often very thin or has no film at all, which seriously affects the ability of the car body to resist piercing and corrosion. Although many paint suppliers and A lot of efforts have been made in the manufacture of coating equipment, but the problem of corrosion in the cavity of the automobile body still cannot be completely solved

Method used

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  • Anti-corrosion technology for metal sheet hollow cavity of car body

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Effect test

Embodiment 1

[0015] For the two car doors with the same coating process, the metal sheet used for one door is a cold-rolled sheet, and the metal sheet used for the other door is a galvanized sheet. After being placed in the open air in the seaside area of ​​​​Qingdao, the corrosion situation appeared. obvious difference. It can be seen that there is no obvious difference between the two in the upper part of the outer surface of the car door, but in the lower part, due to the sandwich structure of the door panel, the cavity formed at the inner bottom cannot form a coating film of sufficient thickness in the electrophoretic coating. Therefore, the rust is from the inside to the outside until the rust wears through. At present, the protection of the inner surface of the car door generally adopts the method of wax injection, which increases the cost of wax injection materials, increases the equipment investment and manual operation costs of the wax injection process, and also increases the sel...

Embodiment 2

[0017] For two truck doors using the same metal sheet and the same painting process, because the opening positions and numbers of the inner door panels are different in structural design, the corrosion resistance effect after electrophoretic painting is obviously different. After the panel was cut open, there was no paint film attachment part, and yellow rust appeared on the surface, while the other door was completely coated with cathodic electrophoretic paint, and there was no rust after cutting. Therefore, optimizing the structural design of automobile products to make the paint film of each part complete is also one of the effective ways to improve the anti-corrosion performance of the whole vehicle.

Embodiment 3

[0019] During the electrophoretic coating process, under the action of an electric field, the ability of the electrophoretic paint to coat the part of the object to be coated away from the corresponding electrode, that is, the ability to paint on the weld and inner cavity of the coated workpiece, is called electrophoretic paint. penetration. At present, the 4-box method (4-box method) is generally used to evaluate the throwing power of cathodic electrophoretic coatings, which is closer to simulating the actual throwing performance of the interior of the car body than the steel pipe method and the volt box method. In this method, the film thickness of each part of the four boxes is used as the evaluation object, and the four test boards are arranged vertically, and the order is as follows: figure 1 shown. The distance between the boards is 20mm, and the painted surfaces of the test boards are recorded in order from left to right: A-side / B-side-C / D-side-E-side / F-side-G-side / H-s...

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Abstract

The invention relates to an anti-corrosion technology for a metal sheet hollow cavity of a car body, which is characterized by enhancing the anti-corrosion performance of the metal sheet hollow cavity of the car body through adopting electrophoretic materials with high throwing power, optimized structural design and optimally selecting metal sheets. The process comprises the following steps: optimally selecting the metal sheets which comprise cold-rolled sheets, galvanized sheets, pre-phosphide sheets and organic coating sheets; optimizing product structure, adopting appropriate opening holes to the hollow cavity of the car body by combining with corresponding metal members through welding, riveting, and the like, solving the problem of no coating adhesion by making hole pitch be 2 times of hole diameter or keeping clearance and making the clearance of the hollow cavity with depth of 200mm be 5mm; and selecting and applying electrophoretic paint with high throwing power for coating materials, thereby enhancing the coating thickness of the hollow cavity part of the car body, the part of the inner part departing from electrodes and the slit part to be more than 8 microns, and controlling electrophoretic coating thickness of the outer surface to be 10 to 15 microns. When a 4-box method is adopted to measure throwing power, the thickness ratio of the innermost surface and the outermost surface is more than 0.53, thereby enhancing perforation corrosion resistance performance of the car body, reducing the coating consumption and hollow cavity wax injection amount of the coating of the outer surface, and reducing the coating cost.

Description

technical field [0001] The invention relates to an anti-corrosion technology for a metal plate cavity of a car body, which is a new process method that comprehensively considers the anti-corrosion performance of the metal plate itself, the structural design of the product and the anti-corrosion function of the cathodic electrophoretic primer. Background technique [0002] With the continuous development of my country's automobile industry and the introduction of foreign models and technologies, higher requirements have been put forward for automobile metal sheets and coating anticorrosion, and the requirements for anti-piercing corrosion of automobile bodies have been increased from 5 years to more than 10 years. Therefore, cathodic electrophoretic coating has become the main means to improve the corrosion resistance of automobile body. However, due to the characteristics of electrophoretic paint penetration, the paint film on some cavity parts of the car body is often very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/00
Inventor 王路路朱士凤田富国高成勇刘柯军吴涛田喜迎李文刚宫金宝宋华
Owner CHINA FIRST AUTOMOBILE
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