Brief Introduction of Pickling Corrosion Inhibitor Used in Pickling Process of Packaging Steel Strip

Brief Introduction of Pickling Corrosion Inhibitor Used in Pickling Process of Packaging Steel Strip
　　 During pickling, the acid solution enters the inner layer through the cracks of the oxide scale to corrode the metal matrix. In addition, due to the unevenness of the thickness and structure of the oxide scale, the actual pickling time required for each part of the strip is different, which allows the acid to have the opportunity to interact with the large area or part of the washed matrix iron. This is easy to produce defects such as hydrogen embrittlement, pickling bubbles, over-pickling, which will increase iron loss and acid consumption, and pollute the environment. The hydrogen escaping from the acid will take away a certain amount of acid and form 'acid mist'. , Endanger human health, corrode equipment.
　　 Therefore, while increasing the pickling speed, it is necessary to prevent excessive iron from dissolving. To this end, an appropriate amount of corrosion inhibitor should be added to the acid solution. Its function is mainly to slow down the dissolution rate of iron during pickling and hinder the diffusion of hydrogen into the steel. At the same time, it can generate foam on the surface of the acid solution to reduce the hydrogen being carried into the air. The amount of acid.
　　Pickling corrosion inhibitors are mostly organic, most of which are organic compounds containing nitrogen and sulfur, and some are organic compounds containing phosphorus, arsenic, antimony and bismuth.