Pickling and phosphating process

Pickling and phosphating process is an important step in steel treatment, the purpose of which is to remove Gold

It belongs to surface corrosion, oxide and other impurities to prevent corrosion and promote the adhesion of steel surface.

The following is an example of a steel processing plant to introduce the pickling and phosphating process Body process and related data.

1. Pickling

Pickling is an effective method to remove oxide scale, rust and dirt on steel surface. The specific process is as follows:

Step 3: clean the water. Put the pickled steel into a large amount of running water to completely remove the acid

Residual.

Step 4: surface protection. After alkaline washing, spray a layer of surface protective agent on the steel surface,

To prevent re-oxidation of the steel surface before phosphating.

For the pickling process of the factory, the output is 30 tons per hour and the amount of acid consumed is 100 liters per ton.

The pickling cost per ton is about 2200 yuan.

2. Phosphating

Phosphating is a method of steel surface treatment, which can form a fixed layer on the steel surface

The phosphating film after physical and chemical reactions improves the surface hardness, wear resistance and corrosion resistance. Specific process As follows:

Step 1: clean. Put the steel after pickling on the surface into the cleaning solution for cleaning to remove the residue.

Residual acid and other impurities.

Step 2: expose. Put the cleaned steel into the phosphating tank and soak for 20-

In 30 minutes, uniform phosphate and zinc phosphate layers will be formed on the steel surface.

Step 3: clean the water. Put the phosphated steel into running water to remove the phosphorus remaining on the surface.

Phosphate and zinc phosphate.

Step 4: dry. The steel after the water is shaken off is dried through the drying room.

The output of phosphating process is 20 tons per hour, and the amount of phosphating agent consumed is 50 kilograms per ton, per ton

The cost of phosphating is about 2400 yuan.

Through the above-mentioned pickling and phosphating process, the steel surface can be clean, dry and shaped

Form a uniform phosphate and zinc phosphate layer to improve its surface hardness, wear resistance and corrosion resistance.

It provides excellent conditions for the subsequent steel treatment process.

Step 1: Clean the steel surface. Put the steel into the cleaning solution for cleaning, remove the surface grease and

Impurities.

Step 2: pickling. Put the cleaned steel into the pickling tank, and the pickling solution is mainly HC1 and HF

Such as mixed acid, remove the oxide scale and rust on the steel surface.