Automobile body-coating method

a body coating and automobile technology, applied in the direction of fluid pressure measurement, liquid/fluent solid measurement, peptide measurement, etc., can solve the problems of vibration and noise, difficult to obtain uniform coating film thickness, and inability to form a coating film showing good finished appearance and good coating film performan

Inactive Publication Date: 2003-10-30
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, application of the conventional coating method to an automobile body part comprising the aluminum material makes it impossible to form a coating film showing good finished appearance and good coating film performances.
A use of an aluminum material in a part of the automobile body, for example, hood, roof, bonnet and the like, may produce such problems that vibration may produce noises while the automobile is running.
However, the direct coating onto the automobile body produces such problems that a selection of an optimum coating method is troublesome, that a uniform coating film thickness is difficult to obtain, that coating drawbacks due to coating, for example, cissing, spitting, foreign particles and the like, may develop, that the coating composition necessary for coating may be consumed in an excess amount, that safe performances of a working environment for coating and controls of safety and health are difficult, that difficulties of recovering used coating films are undesirable from the standpoint of environmental pollution, that use of the spray coating as usual is unable to provide a wide application in appearance, that finishing is planar and short of steric feeling, and the like.
The above setting or predrying means drying under essentially non-curable conditions when heat-curable.
On the other hand, a Ra less than 0.01 .mu.m may result poor adhesion properties between a cationic electrodeposition coating film and the aluminum material.
When the Tg is higher than 0.degree. C., a finally formed coating film show poor properties in anti-chipping properties, corrosion resistance, physical performances and the like.
On the other hand, when lower than -75.degree. C., a finally formed coating film shows poor properties in water resistance, adhesion properties and the like.

Method used

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  • Automobile body-coating method

Examples

Experimental program
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Effect test

example 1

[0247] A 0.8 mm thick aluminum plate material (JIS A6061) was subjected to a degreasing washing, followed by subjecting to a surface treatment with a zinc phosphate based treating agent, coating a cationic electrodeposition coating composition Elecron GT-10 (blocked polyisocyanate-curing epoxy resin electrodeposition coating composition, trade name, marketed by Kansai Paint Co., Ltd.), heat-curing at 170.degree. C. for 20 minutes so as to obtain an electrodeposition coating plate having a dry coating film thickness of about 20 .mu.m, spray coating the following heat-curable water based intercoat coating composition so as to be a film thickness of 30 .mu.m heat-curing at 140.degree. C. for 20 minutes, spray coating a heat-curable topcoat coating composition (Neoamilac #6000 white, trade name, marketed by Kansai Paint Co., Ltd. organic solvent based) so as to be a dry film thickness of about 80 .mu.m, and heat-curing at 140.degree. C. for 20 minutes to obtain respective test coating p...

examples 2-26

[0248] Respective test coating plates of Examples 2-26 were prepared by the methods as described in Tables 1 and 2.

examples 27-38

[0249] A 0.8 mm thick aluminum plate material (JIS A6061) was subjected to a degreasing washing, followed by subjecting to a surface treatment with a zinc phosphate treating agent to obtain a surface-treated aluminum material, separately a zinc-iron alloy molten zinc-plated steel plate was subjected to a surface treatment with a zinc phosphate treating agent, coating a following cationic electrodeposition coating composition so as to be a film thickness of 20 .mu.m, washing with water, heat-curing at 170.degree. C. for 20 minutes to obtain an electrodeposition coating-treated steel plate, welding the surface-treated aluminum material and the coating-treated steel plate so that both coating surfaces are in the same side, subjecting both aluminum plate material and steel plate material to coating under the coating conditions as described in Tables 1 and 2.

[0250] In Tables 1 and 2, the anodized treatment was carried out as follows.

[0251] A 0.8 mm thick aluminum plate material (JIS A606...

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Abstract

An automobile body-coating method which comprises optionally subjecting an aluminum material in the automobile body to a surface treatment, followed by subjecting to an oxidizing film treatment, essentially or optionally, respectively and successively forming a curable electrodeposition coating film, a water based chipping primer coating film, an intercoat coating film, and a curable topcoat coating film, or comprises applying a film racing material onto an aluminum material or coating film-coated aluminum material, and comprises forming respective multi-layer coating films onto the steel material in the automobile body respectively.

Description

[0001] (1) Field of the Invention[0002] The present invention relates to a coating method of an automobile body partly or wholly consisting of an aluminum material or an oxidized aluminum material, which method is capable of forming a coating film showing good coating film finished appearance in definition properties, smoothness and the like, and good coating film performances in corrosion resistance, fabrication properties and the like.[0003] The present invention also relates to an automobile body-coating method comprising applying a film facing material onto the surface of an aluminum material or an aluminum-material-coated steel material in an outer plate area and / or an inner plate area-of an automobile body comprising an aluminum material, an aluminum material-coated steel material or an aluminum material and steel material-combined metal material, and capable of forming a coating film showing good coating film finished appearance in definition properties, smoothness and the li...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05D1/00B05D3/10B05D7/00B05D7/14B29C63/02B29C63/48B32B15/08
CPCB05D1/007C04B2237/402B05D7/14B05D7/50B05D7/546B05D7/577B05D7/582B05D7/586B05D7/587B05D2202/10B05D2202/25B32B15/08B32B2311/24C04B35/62821C04B2235/3427B05D3/102
Inventor NAKAMURA, SHIGERUSUGAI, HIDEO
Owner KANSAI PAINT CO LTD
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