Hydrochloric acid in metalworking applications such as what is the concentration of hydrochloric acid, plating pre-treatment of steel parts washed first with caustic soda solution to remove the oil, and then soaked in hydrochloric acid; metal before welding, the need to weld coated with a little hydrochloric acid, etc. , it is the use of hydrochloric acid to dissolve metal oxides of this nature, to remove the rust. Thus, in order to obtain the metal plated jail concentrated hydrochloric acid, welding was in prison. Metal waste acid pickling metallic material production process, the removal of material surface oxide layer (scale) acid react with the metal to form the corresponding acid salt, pickling salt when saturated, decrease the effectiveness of the pickling solution, It must be replaced, the resulting waste acid. Such waste acid composition is relatively simple, the main component of the residual acid, concentrated hydrochloric acid salt effect, some production processes in mineral oil or acid mist inhibitors. Standard concentrated hydrochloric mechanical products processing, mechanical parts before plating surface treatment, mechanical parts for pickling. Such waste acid metal salt complex composition, small amounts of waste acid every day, usually a batch process. Such waste acid in sulfuric acid, phosphoric acid based. Density of concentrated hydrochloric acid, Zhengzhou Longda Chemical, concentrated hydrochloric acid is provided by Zhengzhou Longda Chemical Products Co., Zhengzhou Longda Chemical Products Co., Ltd. (www.longdahuagong.com/) is a leader in Zhengzhou, Henan Province, chemical reagents, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Zhengzhou Longda Chemical leadership with the staff warmly welcome all inquiries negotiations to create the Zhengzhou Longda Chemical better future.