Aluminized steel fastener type scaffolding steel pipe and preparation method thereof
A technology of scaffolding and aluminized steel, which is applied in the field of scaffolding steel pipes, can solve the problems that the corrosion of scaffolding steel pipes has not been detected and prevented in time, the surface roughness of anti-rust paint is small, and the strength of scaffolding steel pipes is affected, so as to achieve excellent antirust ability and eliminate Surface brittle zone, effect of improving thermal shock resistance and thermal fatigue resistance
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Embodiment 1
[0073] 1. Cut Q235 ordinary steel pipe with a diameter of 48.3mm, a wall thickness of 3.6mm and a length of 4m;
[0074] 2. Baking and degreasing, put the workpiece in an environment of 420 ° C for 10 minutes;
[0075] 3. Pickling and rust removal, the workpiece is placed in 2.5% wt98H by mass 2 SO 4 , 16% wt36HCI aqueous solution, the time is 3min; the alternating current in the pickling tank is 40A, the power frequency is 9kHz, and the pickling time is 2min;
[0076] 4. Washing with water, place the workpiece in high-pressure water for 5 minutes;
[0077] 5. Activation, the workpiece is placed with a mass percentage of 1.8%Na 2 B 4 o 7 , 2%NaNO 2 , 30%NaOH aqueous solution, the time is 30s;
[0078] 6. To aid infiltration, the workpiece is placed with a mass percentage of 0.3%ZrF 4 , 0.12%Na 2 ZrF 6 , 0.05%ZrO 2 , 0.05%KMnO 4 In the aqueous solution, the time is 5min;
[0079] 7. Drying, the workpiece is dried in an environment of 300 ° C for 3 minutes;
[0080...
Embodiment 2
[0082] 1. Cut Q235 ordinary steel pipe with a diameter of 48.3mm, a wall thickness of 3.6mm and a length of 4m;
[0083] 2. Baking and degreasing, chemically degreasing the workpiece, and baking and degreasing treatment in the temperature range of 425°C for 10 minutes until the surface is clean and oil-free.
[0084] 3. Pickling and derusting, the workpiece after degreasing is immersed in the pickling solution, and the component of the pickling solution is wt98H with a mass percentage of 2.5% 2 SO 4 , 16% wt36HCl, and the balance is water; pickling is carried out in a sulfuric acid pool with alternating current, the current value is 40A, the power frequency is 9kHz, and the pickling time is 2min.
[0085] 4. Wash with water, wash the workpiece with high-pressure water for 2 times after derusting.
[0086] 5. The surface is activated, and the workpiece after washing is immediately immersed in 1.8% Na by mass percentage 2 B 4 o 7 , 2%NaNO 2 , 30% NaOH, and the balance is w...
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