Waterborne anti-corrosion coating method for hot-galvanized U-shaped pre-buried channel and fitting
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A technology of pre-embedded channels and coating methods, which is applied in the chemical field, can solve problems such as poor performance and serious environmental pollution by heavy metals, and achieve the effects of excellent impact resistance, no heavy metal pollution, and reduced energy consumption
Inactive Publication Date: 2019-03-26
XUANCHENG BODI NEW MATERIALS CO LTD
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[0012] The present invention provides a U-shaped pre-embedded channel and accessories that have been hot-dip galvanized for the existing problems of heavy metal pollution, poor performance, etc. Water-based anti-corrosion coating method
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Embodiment 1
[0044] Apply water-based anti-corrosion coating to the hot-dip galvanized U-shaped embedded channel, the specific steps are as follows:
[0045] S1: Mechanical surface treatment, shot blasting treatment, select 150-mesh metal shot, enter the shot blasting machine by the method of passing through at 2000 speed, the shot blasting time is 0.1-15 minutes, remove all zinc slag, and make the surface The roughness reaches 10-25 microns;
[0046] S2: chemical surface treatment, use alkaline cleaning agent, spray for 1-3 minutes at 60-90 ℃, wash with water for 1-3 minutes, and then coat a layer of chromate-free passivation film, the coating temperature is 20-100 ℃, the coating time is 1-30 minutes, and the total film weight of the plated chromate-free passivation film is 0.2-10 grams per square meter;
[0047] S3: Electrodeposition primer coating, using epoxy cathodic electrodeposition coating, the composition is: resin 20%, resin includes epoxy, epoxy ester and polyurethane, pigment ...
Embodiment 2
[0051] Carry out water-based anti-corrosion coating on the pre-embedded channel support that has been hot-dip galvanized, and the specific steps are as follows:
[0052] S1: Mechanical surface treatment, shot blasting treatment, select 120-mesh metal shot material, adjust the speed by frequency conversion, let the shot material be thrown to the support at a speed of 30-60 m / s, and the shot blasting time is 0.1-15 minutes to remove all zinc slag Sag, make the surface roughness reach 10-25 microns;
[0053] S2: chemical surface treatment, use alkaline cleaning agent, spray for 1-3 minutes at 60-90 ℃, wash with water for 1-3 minutes, and then coat a layer of chromate-free passivation film, the coating temperature is 20-100 ℃, the coating time is 1-30 minutes, and the total film weight of the plated chromate-free passivation film is 0.2-10 grams per square meter;
[0054] S3: Electrodeposition primer coating, using epoxy cathodic electrodeposition coating, the composition is: res...
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Abstract
The invention discloses a waterborne anti-corrosion coating method for a hot-galvanized U-shaped pre-buried channel and fitting. The waterborne anti-corrosion coating method comprises the following steps: S1 of performing mechanical surface treatment, wherein shot-blasting treatment is performed on the substrate surface of the hot-galvanized U-shaped pre-buried channel and fitting to remove zinc slag, attachment and oxide parts on the surface of the hot-galvanized layer; S2 of performing chemical surface treatment, wherein the substrate surface is chemically degreased and cleaned, and then issubjected to environment-friendly sealing pre-treatment; S3 of dip-coating and electro-depositing primer; S4 of spraying or dip-coating waterborne finishing coat; and S5 of performing coating maintenance. The waterborne anti-corrosion coating method can meet performance requirements of the existing U-shaped pre-buried channel and fitting, enables the existing U-shaped pre-buried channel and fitting to have excellent impact resistance, salt mist resistance and acid and alkaline resistance, can achieve anti-corrosion technical requirements of the pre-buried channel; and meanwhile, in a processing and producing process, heavy metal pollution is avoided, energy consumption is reduced, volatilization of a great deal of VOCs is avoided, harm on environment and health is avoided, and the anti-corrosion effect and the environment-friendly technical problem, which are not solved for a long time in the industrial application field, are solved.
Description
technical field [0001] The invention belongs to the field of chemical technology, relates to plating of metal materials, in particular to a water-based anti-corrosion coating method for hot-dip galvanized U-shaped pre-embedded channels and fittings. Background technique [0002] Because of its advantages such as adjustable position, strong dynamic and static load, labor-saving installation, short construction period, environmental protection and safety, the pre-embedded channel has been used in China's high-speed rail since 2005, and the 2013 Shenzhen Metro Line 9# line uses the German Harbin Starting from pre-buried channels such as Fen, the technology of pre-buried channels is becoming more and more popular, and its application range in subways, high-speed rails, tunnels, elevateds, buildings and other fields continues to expand. [0003] After 2005, China's urban high-speed rail and other rail transits showed explosive growth. With the development of rail transit, the pr...
Claims
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Application Information
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