Carbon Steel Surface
A. Jayashree,1 F. Rajammal Selvarani,1 J. Wilson Sahayaraj,2 A. John Amalraj,3 S. Rajendran4,*
1Department of Chemistry, Holy Cross College, Tiruchirappalli-620 002, Tamil Nadu, India
2Department of Chemistry, Jeppiar College of Engineering, Chennai – 600 119, Tamil Nadu, India
3Department of Chemistry, Loyola College, Chennai, Tamil Nadu, India
4Corrosion Research Centre, Department of Chemistry, GTN Arts College, Dindigul-624 005,Tamil Nadu, India
]]> Received 25 July 2008; accepted 27 November 2008
Abstract
The inhibition efficiency (IE) of malonic acid (MA)-Zn2+ system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of MA and 50 ppm of Zn2+ has 85% IE. The influence of N-cetyl-N,N,N-trimethylammonium bromide (CTAB) and N-cetyl pyridinium chloride (CPC) on the IE of the MA- Zn2+ system has been studied. At lower pH value (pH=6) IE decreases and in alkaline medium (pH=8) IE increases. Polarization study reveals that MA-Zn2+ system functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe2+-MA complex and Zn(OH)2.
Keywords: carbon steel, corrosion inhibition, malonic acid, well water.
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* Corresponding author. E-mail address: srmjoany@sify.com
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