The technology of acid pickling, phosphating, spraying and powder spraying for automatic filter
As we all know, in order to extend the service life of the automatic filter, people usually use spray powder technology. However, if the equipment has oxide layer, it needs to be treated with oxide layer. If it is not treated properly, it will affect the adhesion of the substrate surface and shorten the antirust time. What should be done? Pickling and phosphating are generally recommended.
What is pickling and Phosphating for automatic filter?
Acid pickling and phosphating is mainly aimed at the process of metal surface treatment. Acid pickling is to clean the metal with a certain concentration of acid to remove the rust on the surface; phosphating is to soak the acid pickling metal with phosphating solution to form an oxide film on the surface, which can prevent rust, improve the adhesion of paint and prepare for the next process. Generally, phosphating can enhance the corrosion resistance and The binding force is more than 2 times.
How to carry out pickling and phosphating of automatic filter?
Generally, for phosphating treatment, the surface of automatic filter shall be clean metal surface (except for two in one, three in one and four in one). Before phosphating, the automatic filter must be pretreated for removing grease, rust, oxide skin and surface adjustment.
Pickling is the most widely used method in industry. Hydrochloric acid, sulfuric acid and phosphoric acid are the most commonly used in pickling. Hydrochloric acid pickling is suitable for use at low temperature, not more than 45 ℃, with a concentration of 10% - 45%, and appropriate acid mist inhibitors should be added; sulfuric acid pickling is suitable for use at medium temperature, with a temperature of 50-80 ℃, with a concentration of 10% - 25%; while phosphoric acid pickling is suitable for use at room temperature to 80 ℃, with a concentration of 10% - 40%, generally without corrosive residues, which is relatively safe, but with high cost, Pickling speed is slow.
Surface adjustment is the key to form a fine and dense phosphating film and improve the phosphating speed. The surface adjusting agent mainly includes acid surface adjusting agent (such as oxalic acid) and colloidal titanium. In the automatic filter of phosphating pretreatment, whether to choose surface adjusting process and which surface adjusting agent to choose are generally determined by the requirements of process and phosphating film.
How to deal with automatic filter spray powder?
Spraying means that alloy powder is sprayed on the surface of automatic filter by heating to form wear-resistant layer or repair worn part; spraying means that plastic powder is sprayed on the surface of automatic filter in the presence of electrostatic field, and then solidified into protective layer at high temperature.
Generally speaking, acid pickling and phosphating spraying powder spraying technology is the key factor to improve the corrosion resistance of metal and the adhesion of paint film.
In the filtration industry, the acid pickling, phosphating, spraying and powder spraying device in the new factory building of Jiangsu union filtration equipment Co., Ltd. located in Wuxi City, Jiangsu Province, can greatly improve the product quality and reduce the cost! Products from Jiangsu union filtration equipment Co., Ltd. The following picture:
Unite suction type multi filter element backwash filter
Unite tubular backwash filter