Investigation of the inhibitive effect of N-phosphono-methyl-glycine on the corrosion of carbon steel in neutral solutions by electrochemical techniques
Steady-state current-voltage curves for various disk rotation rates were combined with electrochemical impedance measurements to investigate the corrosion inhibition of carbon steel by N-phosphono-methyl-glycine (NPMG)/Zn{sup 2+} mixtures with a concentration ratio of 1:1 between NPMG and zinc cations in a model water. Efficiency of the NPMG/Zn{sup 2+} formulation increased with concentration in the range from 10 ppm to 100 ppm, and it performed as a mixed type inhibitor, retarding the rate of the anodic and cathodic reactions. Analysis of impedance measurements by means of a simple model suggested that the oxygen reduction reaction was under mixed activation-diffusion control in blank solutions and nearly under diffusion control in the inhibited solutions. Results showed that with increasing rotation speeds, the rate of oxygen diffusion through the porous layer covering the electrode surface increased and the anodic dissolution reaction became slower.
- Research Organization:
- CINVESTAV-IPN, Merida, Yucatan (MX)
- OSTI ID:
- 20013140
- Journal Information:
- Corrosion (Houston), Journal Name: Corrosion (Houston) Journal Issue: 10 Vol. 55; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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