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Scale Inhibitor For Steam Boiler - China

price: contact company for price

Anticorrosion mechanism

The anticorrosion mechanism of technology BF-30a is to generate a protective film on the boiler metal surface, which can be confirmed by the electrochemical tests.

Figure 1- Effect of the additives on the electrode potential of 20g steel

From the steel electric potential - time curves (Figure 1), under the different conditions, the steel electrode potential experiences the first severe drop and then the stable process with time changing. I.E. firstly, the surface natural protective film destructs, and then the corrosion of the substrate take place. Contrary to the sharp drop of the steel electric potential after the adding of the oxygen scavenger such as sodium sulfite, the steel electric potential after the adding of the BF-30a remains a stable value after a little drop. This value is higher than the steel electric potential value in the water. The possible explanation is that the BF-30a has a significantly suppression to the anodic process.

Figure 2 shows the influence of the BF-30a on the anodic process and the cathodic process for the steel corrosion in water. The BF-30a makes a drastic positive shift of the corrosion potential and a drastic increase of the anodic polarization. But from the cathodic polarization curves, although the BF-30a makes the oxygen ions potential decrease, the cathodic polarization increases significantly. Thus the BF-30a not only strongly inhibits the anodic process of steel corrosion, but also significantly inhibits the cathodic of the corrosion. It is a mixed inhibitor of steel in water. At the same time, the electrochemical test results are the good evidence to show the high inhibition efficiency of the BF-30a.

Figure 2 - Potentiodynamic polarization curve for the steel in water

1.2.2. Scale Inhibition Mechanism

1. Chelating dissolution

The chelating agent can form a stable water-soluble chelate with the calcium ion in water, so that the hard components in water are in the dissolving state. The typical chelating agent is the ethylene diamine tetra-acetate (EDTA) and the nitrilo tri-acetate (NTA), whose inhibition mechanism is the chelating agent in reaction with calcium ion to blockade the scale cation in its molecule and to prevent the combination between the scale cation and the scale anion. By this way, a large number of calcium ions are left in water; the solubility of the micro-insoluble calcium in water increases, so that the calcium in the boiler is in the dissolve state. This chelating agent plays the role as a scale inhibitor. The chemical reaction runs according the stoichiometry: the hard components like calcium in the 1 mg of CaCO3 / L of requires 3.8 mg / L EDTA tetrasodium.

In order to identify the chelating dissolution of BF-30a, it takes the similar test method as the chelant: put the scale of calcium carbonate solids and calcium sulfate solids into the solution of BF-30a for the chelating dissolution test. The test results show that the concentration of the calcium ions increase slowly; that means that the BF-30a is with the moderate chelating ability to dissolve the scale.


Company Contact:


  • Phone: 008613027690702

  • Address: No.2-1803 Soubao Business Center, No.16 South-West, Beijing, China

  • Email: Email


Published date: October 17, 2013 -

  • Business Description: involved in international trade import export of goods, products, and services

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