Malonic Acid as Transporter of Zn²⁺ Towards

Carbon Steel Surface

 

A. Jayashree,¹ F. Rajammal Selvarani,¹ J. Wilson Sahayaraj,² A. John Amalraj,³ S. Rajendran^4,*

 

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