The enamel steel plate must be pre-treated before enamelling. The general methods include: sand blasting, air firing, and chemical cleaning (chemical degreasing method and pickling neutralization method). For the deployment and management of the pre-treatment of enamelled iron billets, the enamelling factory can refer to the following:

1. Degreasing tank: ①After cleaning and cleaning the degreasing tank, add water to a distance of 30 cm from the upper edge of the tank; ②Heat to an appropriate temperature, add the degreasing agent by weighing, and stir the solution in the tank up and down with an empty basket; ③Check the concentration once a day , Check the activity once a week; ④ If the concentration is lower than the standard, it must be added, and if the activity does not meet the standard, and the degreasing agent must be renewed; ⑤ If the degreasing agent has decomposed, no matter how much it is added, it will have no effect.

2. Pickling tank: ① First clean the pickling tank, pour about 1/3 of the water, and then add the pre-calculated concentrated sulfuric acid; ② Add water to 30 cm from the upper edge of the tank; Check once, iron sulfate once a day; ④The concentration of the secondary enamel should be kept above 6%, and when the concentration is low, add an appropriate amount; When the sulfuric acid solution is 15%, the sulfuric acid solution should be replaced with a new one; ⑥ When the solution is renewed, it should be cleaned and checked for rupture of the pickling tank.

3. Nickel-coated tank: ①Add water to a distance of 30 cm from the upper edge of the tank, and heat the water to 60~70°C; ②Add 6~12g/L of nickel sulfate for two times of enamel; ③12~15g/L for one time of enamel, Adjust the pH value at the same time; check the concentration every 4 hours, and check the pH value every 2 hours; ④ Use a filter to remove the iron hydroxide precipitate to increase the life of the nickel washing solution, and the filter element should be cleaned frequently.

Neutralization tank: ①Clean the neutralization tank, add water to the tank, and heat to a temperature of 60~70°C; ②The amount of soda (soda ash) added in the second round is 3.6g/L, borax is 1.2g/L, and the amount of soda added in the first round 1.2g/L, borax 0.4g/L; ③ Move an empty basket up and down to stir the solution before operation; ④ It is best to update the neutralizing solution after daily operation. If you use a filter, update it once a week.

4. The condition of each tank should be continuously checked and recorded.