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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.17 [2010] >
IJCT Vol.17(3) [May 2010] >
| Title: | Influence of sodium hexa metaphosphate antiscalant on the corrosion of carbon steel in industrial cooling water system |
| Authors: | Kumar, Harish
Chaudhary, R S |
| Keywords: | Corrosion inhibitor
Antiscalant
Cooling water system
Carbon steel
SHMP |
| Issue Date: | May-2010 |
| Publisher: | CSIR |
| Abstract: | In order to have clear understanding about
the contribution of antiscalant and zinc ions separately towards the corrosion
control of carbon steel in six different synthetic cooling waters, a single
antiscalant, sodium hexa meta phosphate (SHMP), was tried with and without zinc
ions, which may control scaling as well as corrosion problem in cooling water
system (CWS). Weight loss, electrochemical polarization and metallurgical
research microscopy technique were carried out at
30, 40 and 50°C using different concentrations of the
inhibitor and zinc ions. Mechanism of inhibition is explained on the basis of
molecular structure of the inhibitor. The inhibitor provides good inhibition
efficiency and acts as anodic inhibitor when present alone and mixed inhibitor
with zinc ions. SHMP due to its cyclic structure, forms cage-complex with Fe2+
ions from any two adjacent negatively charged phosphoryl oxygen anions.
Moreover, addition of zinc ions to cooling water along with SHMP, do not
increase inhibition efficiency to an appreciable extent. |
| Page(s): | 181-190 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.17(3) [May 2010]
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