Effect of nitrate ion on corrosion inhibition of mild steel in simulated cooling water
DOI:
https://doi.org/10.3329/cerb.v14i2.4813Keywords:
Corrosion, Potentiodynamic sweep, InhibitorAbstract
Corrosion inhibition of mild steel by sodium nitrite in simulated cooling water (SCW) containing chloride ion was investigated. Electrochemical techniques such as corrosion potential (Ecorr) measurement and potentiodynamic sweep experiments were used. The experimental parameters were concentration of the inhibitor, pH of the aqueous media and soaking time. Nitrite inhibited mild steel corrosion in near neutral and alkaline (pH 6 and above) SCW and accelerated corrosion in acidic media (pH 4 and below). Inhibition activity increased with the increase of nitrite concentration up to 500 ppm, and afterwards remained more or less constant at pH 6 and above. In stagnant SCW, maximum corrosion inhibition was observed at pH 8 for all concentration of NaNO2. Inhibition action of NaNO2 was found to increase with the increase of soaking time up to 24 hours, and afterwards it remained more or less constant at all nitrite concentrations at and above pH 6. Based on the experimental results, mechanisms of action of NaNO2 on mild steel corrosion inhibition in SCW have been proposed.
Keywords: Corrosion; Potentiodynamic sweep; Inhibitor
DOI = 10.3329/cerb.v14i2.4813
Chemical Engineering Research Bulletin 14 (2010) 87-91
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References
Farooqi IH, Quraishi MA and Saini PA, Recent Trends in Cooling Water Inhibitors, in CORROSION 2000, 2000
Ali MR, Mustafa CM and Habib MA, Effect of Molybdate, Nitrite and Zinc Ions on the Corrosion Inhibition of Mild Steel in Aqueous Chloride Media Containing Cupric Ions, Journal of Scientific Research, 2008. 1(1):pp. 8291. doi:10.3329/jsr.v1i1.1053
Sakashita M and Sato N, The effect of molybdate anion on the ion-selectivity of hydrous ferric oxide films in chloride solutions, Corrosion Science, 1977. 17(6):pp. 473486. doi:10.1016/0010-938X(77)90003-8
Vukasovich MS and Robitaille DR, Corrosion inhibition by sodium molybdate, Journal of the Less CommonMetals, 1977. 54(2):pp. 437448. doi:10.1016/0022-5088(77)90066-2
Tosun A and Ergun M, Protection of Corrosion of Carbon Steel by Inhibitors in Chloride Containing Solutions, Gazi University Journal of Science, 2010. 19(3):p. 149
Montes P, Bremner TW and Lister DH, Influence of calcium nitrite inhibitor and crack width on corrosion of steel in high performance concrete subjected to a simulated marine environment, Cement and Concrete Composites, 2004. 26(3):pp. 243253. doi:10.1016/S0958-9465(03)00043-X
Sideris KK and Savva AE, Durability of mixtures containing calcium nitrite based corrosion inhibitor, Cement and Concrete Composites, 2005. 27(2):pp. 277287. doi:10.1016/j.cemconcomp.2004.02.016
Ann KY, Jung HS, Kim HS, Kim SS and Moon HY, Effect of calcium nitrite-based corrosion inhibitor in preventing corrosion of embedded steel in concrete, Cement and Concrete Research, 2006. 36(3):pp. 530535. doi:10.1016/j.cemconres.2005.09.003
Ramasubramanian M, Haran BS, Popova S, Popov BN, Petrou MF and White RE, Inhibiting Action of Calcium Nitrite on Carbon Steel Rebars, Journal o fMaterials in Civil Engineering, 2001. 13(1):pp. 1017. doi:10.1061/(ASCE)0899-1561(2001)13:1(10)
Mustafa CM and Dulal SI, Molybdate and nitrite as corrosion inhibitors for copper-coupled steel in simulated cooling water, Corrosion, 1996. 52(1):pp. 1622. doi:10.5006/1.3292090
Afolabi AS, Synergistic Inhibition of Potassium Chromate and Sodium Nitrite on Mild Steel in Chloride and Sulphide Media, Leonardo Electronic Journal of Practices and Technologies, 2007. 11:pp. 143154
Mustafa CM and Dulal SI, Corrosion behaviour of mild steel in moderately alkaline to acidic simulated cooling water containing molybdate and nitrite, British Corrosion Journal, 1997. 32(2):pp. 133137
Vogel AI, A Text Book of Quantitative Inorganic Analysis, Longmans Publishers, London, 3rd edition, 1961
Jones DA, Corrosion Processes, Applied Science Publishers, London, 3rd edition, 1982
Gunasekaran G, Planiswamy N, Apparao BV and Muralidharan VS, Enhanced synergistic inhibition by calcium gluconate in low chloride media. Part I. Kinetics of corrosion, in Proceedings of the Indian Academy of Sciences - Chemical Sciences, Vol. 108, 1996. pp. 399405
Uhlig HH and Revie RW, Corrosion and Corrosion Control, JohnWiley and Sons, New York, 3rd edition, 1991
