Aluminum alloy wheel coating process

A coating process, aluminum alloy technology, applied in metal material coating process, device for coating liquid on the surface, coating and other directions, can solve the problems of uneven curing effect and unstable passivation effect, and achieve wheel coating. The effect of improved installation performance and uniform film thickness

Inactive Publication Date: 2011-05-18
TIANJIN DAIKA WHEEL HUB MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the coating process of aluminum alloy wheels is generally: pretreatment-drying-dusting-curing-spraying paint-spraying lacquer-curing, in which the pretreatment process is chrome-free passivation, generally using 16-22 points, passivation The curing effect of paint and powder is generally heated by gas hot air circulation, and the temperature in the furnace is set at 170-175°C, so the curing effect is uneven; the paint spraying process generally adopts air spraying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] The main parameters of the process implementation of the present invention are as follows, the workpiece is pre-degreased-degreasing-washing-washing-surface adjustment-pure water washing-pure water washing-passivation-pure water washing-pure water washing-drying paint surface treatment, wherein passivation adopts Chromium-free passivation, the number of points is 24, the pH value is 3.5, and the fluoride ion potential is -60kv; drying and cooling are carried out after surface treatment, the temperature of the drying furnace is set at 90°C, and the holding time is 15 minutes; natural cooling is used for cooling; the treated workpiece Automatic electrostatic spray gun is used for powder coating, the construction voltage is controlled at 70kv, and the powder output is 175m 3 / h; when the powder is solidified, the surface temperature of the workpiece is 180°C, and the holding time is 12 minutes; the paint spraying uses an electrostatic rotary cup spray gun to spray paint on ...

example 2

[0022] Pre-degreasing-degreasing-water washing-water washing-surface adjustment-pure water washing-pure water washing-passivation-pure water washing-pure water washing-drying surface treatment before paint, in which passivation adopts chromium-free passivation, point 26, PH The value is 3.8, the fluoride ion potential is -70kv; drying and cooling are carried out after surface treatment, the temperature of the drying furnace is set at 100°C, the holding time is 15 minutes, and natural cooling is used for cooling; the processed workpiece is powder sprayed with an automatic electrostatic spray gun, and the construction voltage Controlled at 75kv, powder output is 185m 3 / h; the surface temperature of the powder coating curing workpiece is 185°C, and the holding time is 13min; the paint spraying uses an electrostatic rotary cup spray gun to spray paint on the workpiece, the construction voltage of the rotary cup is controlled at -70kv, and the rotational speed of the electrostatic ...

example 3

[0025] Pre-degreasing-degreasing-washing-washing-surface adjustment-pure water washing-pure water washing-passivation-pure water washing-pure water washing-drying paint surface treatment, chrome-free passivation point 27, PH value 3.9, fluoride ion Potential -75kv; drying and cooling after surface treatment, drying furnace temperature is set at 100°C, holding time 15min, natural cooling is used for cooling; automatic electrostatic spray gun is used for powder coating after treatment, construction voltage is controlled at 78kv, powder output 189m 3 / h; the surface temperature of the powder coating curing workpiece is 188 ° C, and the holding time is 14 minutes; the workpiece is sprayed with paint, and the electrostatic rotary cup spray gun is used to spray the paint on the workpiece. The construction voltage of the rotary cup is controlled at -70kv, and the rotation speed of the electrostatic rotary cup is controlled at 30kr / min, the paint output of the rotary cup spray gun is...

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PUM

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Abstract

The invention provides an aluminum alloy wheel coating process, which ensures that wheels produced with the coating process have the characteristics of uniform thickness of paint films and good corrosion resistance. The coating process comprises the following steps of: front surface treatment, powder spraying, powder curing, paint spraying, paint curing and cooling, wherein the chromium-free passivation is utilized, an electrostatic rotary bell spray gun is used to spray paint on work-pieces, the construction voltage of a rotary bell is controlled between -50kV and -60kV, the rotation number of the electrostatic rotary bell is controlled at 25-32 kr/min, the paint spraying quantity of the rotary bell spray gun is 70-100cc/min, the pressure of forming air is controlled at 0.1-0.5MPa, and the distance from the spray gun to the work-piece is between 150mm and 180mm. Because of the optimization of the technological parameters of the processes of chromium-free passivation, curing and paint spraying, the coating performance of the wheels is improved, the unilateral corrosion in a salt spray test does not exceed 2mm, and the thickness of the paint film is uniform.

Description

technical field [0001] The invention relates to a coating process, in particular to an aluminum alloy wheel coating process. Background technique [0002] At present, the coating process of aluminum alloy wheels is generally: pretreatment-drying-dusting-curing-spraying paint-spraying lacquer-curing, in which the pretreatment process is chrome-free passivation, generally using 16-22 points, passivation The curing effect of paint and powder is generally heated by gas hot air circulation, and the temperature in the furnace is set at 170-175°C, so the curing effect is uneven; the paint spraying process generally adopts air spraying or electrostatic spraying, and the process parameters of the spray gun are generally gun The distance is 15cm±2, the amount of spraying paint is 30-50cc / min, the atomization pressure is 0.05-0.25Mpa, and the forming pressure is 0.1-0.2Mpa; for the wheels produced by the existing coating process, the corrosion width of the salt spray test is generally ...

Claims

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Application Information

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IPC IPC(8): B05D1/04B05D1/06B05D3/00C23C22/34
Inventor 臧立根
Owner TIANJIN DAIKA WHEEL HUB MFG
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