The corrosion behavior of mild steel in acetic acid (CH3COOH) solutions was studied by weight loss and potentiostatic polarization techniques. The variation in corrosion rate of mild steel with concentrations of CH3COOH, evaluated by weight loss and electrochemical techniques, showed marked resemblance. From both techniques, the maximum corrosion rate was observed for 20% CH3COOH solution at all three experimental temperatures (25, 35, and 45°C). Anodic polarization curves showed active-passive behavior at each concentration, except at 80% CH3COOH. Critical current density (ic), passive current density (in), primary passivation potential (Epp), and potential for passivity (Ep) had their highest values in 20% CH3COOH solution. With an increase in temperature, while the anodic polarization curves shifted toward higher current density region at each concentration, the passive region became progressively less distinguishable. With the addition of sodium acetate (NaCOOCH3) as a supporting electrolyte, the passive range was enlarged substantially. However, the transpassive region commenced at more or less the same potential. Cathodic polarization curves were almost identical irrespective of the concentration of CH3COOH or temperature.
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1 April 2000
Research Article|
April 01 2000
Corrosion Behavior of Mild Steel in Acetic Acid Solutions
M.M. Singh;
M.M. Singh
*Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221 005,
India
.
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A. Gupta
A. Gupta
**Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221 005,
India
.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2000
CORROSION (2000) 56 (4): 371–379.
Citation
M.M. Singh, A. Gupta; Corrosion Behavior of Mild Steel in Acetic Acid Solutions. CORROSION 1 April 2000; 56 (4): 371–379. https://doi.org/10.5006/1.3280540
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