This method is a chemical method to remove the surface of the forging scale and adhesion of water insoluble salt.Mixer truck raceway. Commonly used methods include sulfuric acid pickling, hydrochloric acid pickling and electrolytic cleaning. Among them, sulfuric acid pickling method and hydrochloric acid pickling method are used more.

1. Sulfuric acid pickling method

The sulfuric acid pickling method uses a sulfuric acid aqueous solution with a mass concentration of 50-200g/l, and the pickling temperature is usually between 60-80.Mixer truck raceway. Sulfuric acid is an oxidizing acid, and its pickling speed is lower than that of hydrochloric acid. Sometimes, in order to speed up the pickling speed, ultrasound can be used as an auxiliary means.

2. Hydrochloric acid pickling

The hydrochloric acid pickling method uses a hydrochloric acid aqueous solution with a mass concentration of 50-200g/L, and the pickling temperature is usually below 40. Hydrochloric acid is a kind of reducing acid, with strong pickling ability. Mixer truck raceway. When used, it may also cause excessive corrosion of the metal substrate under the oxide skin. Therefore, some inhibitors (such as urea or urotropine) are often added to protect the metal matrix during the pickling process. Hydrochloric acid is expensive and forgings are easy to rust after pickling, so it is rarely used in production.

Whether using sulfuric acid pickling method or hydrochloric acid pickling method,Mixer truck racewayIn operation, the forging needs to be cleaned in 40-50 hot water after pickling, and then neutralized in 8%-10% sodium carbonate aqueous solution, and then cleaned with hot water.

Chemical cleaning equipment mainly refers to pickling tank. In order to avoid being corroded by the pickling liquid, the pickling tank is usually made of acid-resistant materials,Mixer truck raceway. Such as acid-resistant concrete, stainless steel, PVC plastic and FRP. In addition, in order to improve working conditions and productivity, some pickling tanks are also equipped with various lifting and continuous conveying devices.