Hub coating process

A wheel and coating technology, applied in the direction of coating, electrolytic coating, electrophoretic coating, etc., can solve the problems of technical parameters to be explored, border crossing and mutual dissolution of color paint, etc., to meet the appearance requirements and achieve the effect of good appearance

Inactive Publication Date: 2016-11-16
KAIPING ZHONGLV IND
4 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

When different paints are applied to the surface of the wheel hub, there may be undesired cross-border and miscible phenomena at the edge of the paint due to the miscibility of the paint applied first and the solvent of the paint applied later
[0004] The electrophoresis process has already been maturely applied in the field...
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Abstract

The invention discloses a hub coating process. The hub coating process comprises the following steps: 1, degreasing; 2, washing with water; 3, pickling; 4, washing with water; 5, passivating; 6, washing with water; 7, spraying bottom powder; 8, drying; 9, spraying colored paint; 10, carrying out electrophoresis; and 11, drying. After being subjected to electrophoresis, the product is good in appearance, does not have defects such as shrinkage cavities or a rough paint film, and can meet requirements of automobile manufacturers to appearances of electrophoresis hubs, and therefore, promotion of the product is facilitated.

Application Domain

Electrophoretic coatings

Technology Topic

ChemistryElectrophoresis +1

Examples

  • Experimental program(1)

Example Embodiment

[0023] The best embodiment of the present invention will be described in further detail below.
[0024] The specific steps of the coating process of the wheel hub are:
[0025] 1. Degreasing: Using alkaline degreasing agent, spray degreasing treatment on the hub for 2 minutes at 50°C; spray pressure 0.1-0.15MPa, alkali point: 6-8;
[0026] 2. Water washing: immerse the hub of No. 1 in clean water, the temperature of the water is 40~50℃, the time is 7~8 minutes, the conductivity <700μs/cm, pH:> 7.0;
[0027] 3. Pickling: using the tank immersion method, the formula of pickling rust removal solution: industrial hydrochloric acid with a concentration of 31%, corrosion inhibitor 3%, temperature: 40~50℃, treatment time 3~8 minutes;
[0028] 4. Water washing: Immerse the 3 wheel hubs in clean water, the temperature of the water is 40~50℃, and the conductivity <600μs/cm;
[0029] 5. Passivation: Passivation: using chromium-free passivation agent, immerse the hub in step 4 in the chromium-free passivation agent for 7-8 minutes; conductivity 150-350μs/cm, pH: 3.8-4.2 activation point : 1.5-2.5;
[0030] 6. Water washing: Immerse the hub of 5 in clean water, the temperature of the water is 40~50℃, and the time is 7~8 minutes;
[0031] 7. Spraying powder: use a spray gun, the spraying range includes front, side and back, and the thickness is controlled within 100-120μm;
[0032] 8. Drying: heating by natural gas, the baking temperature of the workpiece is 180℃×20min;
[0033] 9. Spray color paint: use the spray gun, the spraying range includes the front and side, and the thickness is controlled at 8-12μm;
[0034] 10. Electrophoresis: mix the electrophoretic paint and water evenly, immerse the spokes under the surface of the electrophoretic paint, and keep the bolt holes and center holes outside the electrophoretic paint;
[0035] 11. Drying: baking the obtained wheel hub after electrophoresis to obtain a finished product.
[0036] The electrophoresis power supply voltage is 80V, the electrophoresis time is 120s, and the electrophoresis paint temperature is 25°C.
[0037] The electrophoretic paint is acrylic; the ratio of the electrophoretic paint to water is 1:2-15, and the conductivity of the pure water used for the paint is not greater than 10 μs/cm.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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