Can sodium hexametaphosphate play a role in corrosion inhibition?

sodium hexametaphosphate can act as a corrosion inhibitor and the effect is significant.

Causes of corrosion:

Anaerobic bacteria:

1, is highly corrosive

2, can survive in places where oxygen is lacking.

3, can produce strong destructive: especially in places where nutrient sources are sufficient, such as sulfur, the product is highly corrosive.

4, can lead to local corrosion, perforation, extremely difficult to handle.

Iron bacteria:

It is widely found in water sources and can convert Fe into FeO.

Nitrifying bacteria

It can convert NH3 to NO3-, lowering the pH and making the water corrosive.

Therefore, in order to make the polyphosphate play a better corrosion inhibition effect, a certain amount of divalent metal ions, such as calcium, iron or zinc ions, are required in the cooling water, and it is not suitable to use polyphosphoric acid in soft water with little calcium ion content. Salt as a corrosion inhibitor. The calcium removal content in water has a great influence on the corrosion inhibition effect of polyphosphate. The dissolved oxygen content also affects the antiseptic effect. This is because if the water does not contain dissolved oxygen, the polymerized phosphate in water should form a soluble complex with iron. Things promote corrosion.

 However, sodium hexametaphosphate is a polyphosphate that forms a complex as a dissolved metal ion in water, and does not accumulate on the metal surface to form a protective film to reduce corrosion.

The hexametaphosphate produced by Zhengzhou Yucai Phosphate Chemical Plant belongs to the cathode type precipitation film corrosion inhibitor. Complex ions forming a peptized state with divalent metal ions such as Ca2+, Mg2+, Zn2+, Fe2+ in water, and corrosion current deposited on the surface of the metal cathode to form an electrodeposited layer protective film, suppressing the cathodic reaction to reduce the corrosion rate and inhibit corrosion effect. It works best at pH 6 or so, and it is effective in reducing pitting and rust.



Zhengzhou Yucai Phosphate Chemical Factory specializes in the production of sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, disodium hydrogen phosphate, industrial phosphoric acid, trisodium phosphate, aluminum dihydrogen phosphate, solid aluminum dihydrogen phosphate, liquid dihydrogen phosphate Aluminium, sodium dihydrogen phosphate and other phosphate series products have been pursued and developed for more than 30 years. They rely on skilled chemical technology and product development, equipment renewal and establish a good cooperative relationship with many universities. In the chemical industry, we have branded (Yucai Phosphate)!