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http://dx.doi.org/10.14773/cst.2010.9.3.137

Study on The Corrosion Inhibition Characteristics of Carbon Steel by Sodium Phosphate And Sodium Nitrite  

Moon, Jeon-Soo (Green Growth Laboratory, Korea Electric Power Research Institute)
Lee, Jae-Kun (Green Growth Laboratory, Korea Electric Power Research Institute)
Publication Information
Corrosion Science and Technology / v.9, no.3, 2010 , pp. 137-141 More about this Journal
Abstract
Sodium nitrite is widely used as one of the popular corrosion inhibitors for the protection of ferrous metal in closed cooling water system, such as a diesel engine and a chiller. The optimum treatment conditions are studied through laboratory tests using linear polarization resistance (LPR) technique. Corrosion rate of the carbon steel electrode could be maintained less than $2.5{\times}10^{-3}$ mmpy in the test condition of 500 ppm as ${NO_2}^-$, 200 ppm as $Cl^-$, $70^{\circ}C$ and pH 6.8. The pH control is confirmed not to be an important factor in the protection of carbon steel by sodium nitrite inhibitor. The addition of tolyltriazole was needed for the protection of the copper alloy in the sodium nitrite treatment system.
Keywords
Cooling Water; Carbon Steel; Corrosion Inhibition; Sodium Nitrite;
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  • Reference
1 V. A. Kumari, K. Sreevalsan, and M. A. Shibli, Corrosion Prevention & Control, p. 83 (2001).
2 K.N. Mohana and A.M. Badiea, Corros. Sci., 50. 2939 (2008).   DOI   ScienceOn
3 Closed Cooling Water Chemistry Guideline, Revision 1. EPRI, Palo Alto, CA, TR-107396.3 (2004).
4 A.A. Moccari, Materials Performance, p. 54 (1999).
5 B.P. Boffard, Fundamentals of Cooling Water Treatment, Calgon Corp., PA.