Steel tube solvent-free resistance-reducing internal layer coating method
A coating method and solvent-free technology, which can be applied to devices for coating liquid on surfaces, coatings, pretreatment surfaces, etc. The effect of high corrosion resistance and high hardness
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Embodiment 1
[0021] 1. Steel pipe preheating: use a 20kw high-pressure hot air unit to preheat the inner wall of the steel pipe to be coated to 40°C;
[0022] 2. Derusting and degreasing: Use a shot blasting machine to remove rust on the inner wall of the steel pipe. The speed of the shot blasting machine is 2800 rpm, the mixing ratio of steel shot and steel sand is 5:1, and the rust removal level reaches GB / T The Sa2.5 grade specified in 8923, the inner surface roughness of the steel pipe is 30-50μm, the steel grit and steel shot used for shot blasting should meet the requirements of the ISO11124-3 standard, the steel shot model is S280, and the steel grit model is G25, If there is oil pollution on the surface of the steel pipe, use alkali cleaning equipment to clean the oil on the surface of the steel pipe;
[0023] Referring to the GB / T 18570.3 standard, the surface cleanliness of the steel pipe is tested with pressure-sensitive tape, and the dust on the inner surface of the steel pipe ...
Embodiment 2
[0042] 1. Steel pipe preheating: use a 20kw high-pressure hot air unit to preheat the inner wall of the steel pipe to be coated to 45°C;
[0043] 2. Derusting and degreasing: use a shot blasting machine to remove rust on the inner wall of the steel pipe, the speed of the shot blasting machine is 2900 rpm, the mixing ratio of steel shot and steel sand is 5:1, and the rust removal level reaches GB / T The Sa2.5 grade specified in 8923, the inner surface roughness of the steel pipe is 30-50μm, the steel grit and steel shot used for shot blasting should meet the requirements of the ISO11124-3 standard, the steel shot model is S280, and the steel grit model is G25, If there is oil pollution on the surface of the steel pipe, use alkali cleaning equipment to clean the oil on the surface of the steel pipe;
[0044] Referring to the GB / T 18570.3 standard, the surface cleanliness of the steel pipe is tested with pressure-sensitive tape, and the dust on the inner surface of the steel pipe ...
Embodiment 3
[0062] 1. Steel pipe preheating: use a 20kw high-pressure hot air unit to preheat the inner wall of the steel pipe to be coated to 50°C;
[0063] 2. Derusting and degreasing: Use a shot blasting machine to remove rust on the inner wall of the steel pipe. The speed of the shot blasting machine is 3100 rpm, the mixing ratio of steel shot and steel sand is 5:1, and the rust removal level reaches GB / T The Sa2.5 grade specified in 8923, the inner surface roughness of the steel pipe is 30-50μm, the steel grit and steel shot used for shot blasting should meet the requirements of the ISO11124-3 standard, the steel shot model is S280, and the steel grit model is G25, If there is oil pollution on the surface of the steel pipe, use alkali cleaning equipment to clean the oil on the surface of the steel pipe;
[0064] Referring to the GB / T 18570.3 standard, the surface cleanliness of the steel pipe is tested with pressure-sensitive tape, and the dust on the inner surface of the steel pipe ...
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