Corrosion inhibition principle of sodium hexametaphosphate

A linear polyphosphate such as sodium hexametaphosphate, in which the oxygen atom of the anion chelates the Ca 2 ion in the water to form a peptized charged ion. When the steel is corroded in water, the Fe-ion of the anode reaction product will diffuse and move toward the cathode to generate a certain corrosion current. The Fe ion and the calcium polyphosphate complex ion form a complex ion with calcium polyphosphate as the main component, relying on the corrosion current. Electrodeposition on the surface of the cathode forms a denser precipitated film thereby inhibiting the cathodic reaction of the corroded cell. For example, mercaptobenzothiazole is a precipitated complex on the copper surface. Therefore, in the cooling water system, the benzoyl benzothiazole is one of the most effective adsorption-type corrosion inhibitors for copper and copper alloy equipment.

Zhengzhou Yucai Phosphate Chemical Factory specializes in the production of phosphate series products such as sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, disodium hydrogen phosphate, industrial phosphoric acid, trisodium phosphate, aluminum dihydrogen phosphate, solid aluminum dihydrogen phosphate, liquid aluminum dihydrogen phosphate, sodium dihydrogen phosphate, etc. After more than 30 years of continuous pursuit and development, it has established a good cooperative and sharing relationship with many colleges and universities through skillful chemical technology and product development, equipment renewal, and has established a brand of ( Yucai Phosphate ) in the chemical industry!