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Aoxin New Material
Aoxin New Material
Committed to the production and sales of cold rolled plate, galvanized plate, 55% aluminized zinc hanging plate, galvanized color coated plate, aluminized zinc color coated steel plate, fingerprint resistant plate, wood grain plate and printing plate.
Pickling and Rinsing before Production of Hot Galvanized Sheet
Release time:
2024-04-25
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The pickling and rinsing process before the production of hot-dip galvanized sheet is very strict, and only in this way can we produce high-quality qualified production. 1. Before preparing pickling solution, the acid pool must be washed clean, and rust, silt and other attachments are not allowed to be stored in the pool. 2. The pickling solution is diluted hydrochloric acid, the working concentration is 40-200g/L solution, and the working temperature is normal temperature.
The pickling and rinsing process before the production of hot-dip galvanized sheet is very strict, and only in this way can we produce high-quality qualified production.
1. Before preparing pickling solution, the acid pool must be washed clean, and rust, silt and other attachments are not allowed to be stored in the pool.
2. The pickling solution is diluted hydrochloric acid, the working concentration is 40-200g/L solution, and the working temperature is normal temperature.
3. Preparation of pickling solution: Industrial hydrochloric acid with a concentration of more than 28% is used, and water is added according to a ratio of 2: 1 to prepare pickling solution with a concentration of 200g/L. Generally, no acid is added during use until its concentration drops below 40/L. When the ferrous chloride content rises to 200g/L solution, the waste acid enters the neutralization tank for treatment and is discharged after reaching the standard (the discharge requirements are stipulated by the environmental protection department). If the content of ferrous chloride is less than 200g/L and the concentration of hydrochloric acid is less than 40g/L, concentrated hydrochloric acid can be appropriately added to continue to use.
4. Pickling fluid is tested twice a week, and the measurement results are reported to the director of the shift workshop in the hot galvanized sheet workshop to guide the pickling operator.
5. The pickling time shall be related to the oxide layer on the surface of the hot-dip galvanized sheet and the pickling concentration, generally 30-40 minutes. During the pickling process, the workpiece shall be moved up and down for two to three times, and the liquid level shall be proposed to check the pickling quality. The surface under pickling can be removed by grinding wheel, wire brush and other tools before pickling, so that the steel surface is free of residual oxide layer and other pollutants, and the surface is gray luster.
6, pickling qualified hot galvanized plate must enter the rinsing process tank by running water to remove the residual pickling solution on the surface. After the plated parts are lifted out of the rinsing tank, they will stay on the tank for not less than 15 seconds. After the surface water is dropped, they should immediately enter the plating aid tank for solvent treatment.
The rinsing water should be clear, keep flowing, keep clean, and the PH value should be greater than 6.
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