Corrosion inhibition efficiency and surface activity of benzothiazol-3-ium cationic Schiff base derivatives in hydrochloric acid

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

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Electrochemical and Surface Morphological Studies of Carbon Steel Corrosion by a Novel Polynuclear Schiff Base in HCl Solution

ISRN Electrochemistry ◽

10.1155/2013/820548 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

K. S. Shaju ◽

K. Joby Thomas ◽

Vinod P. Raphael ◽

Aby Paul

Keyword(s):

Weight Loss ◽

Schiff Base ◽

Carbon Steel ◽

Hydrochloric Acid ◽

Adsorption Isotherm ◽

Acid Solution ◽

Corrosion Inhibition ◽

Hydrochloric Acid Solution ◽

Inhibition Efficiency ◽

Morphological Studies

The corrosion inhibition efficiency of a potential polynuclear Schiff base, (s)-2-(anthracene-9 (10H)-ylidene amino)-5-guanidinopentanoic acid (A9Y5GPA), on carbon steel (CS) in 1 M hydrochloric acid solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization studies. The corrosion inhibition efficiencies of parent amine [(s)-2-amino-5-guanidinopentanoic acid] and parent ketone (anthracene-9 (10H)-one) on carbon steel in 1.0 M hydrochloric acid solution have also been investigated using weight loss studies. The electrochemical and weight loss data established that the inhibition efficiency on CS increases with the increase in the concentration of inhibitor, A9Y5GPA. The adsorption of A9Y5GPA obeys the Langmuir adsorption isotherm. Thermodynamic parameters (Kads, ΔGads0) were calculated using the adsorption isotherm. Activation parameters of the corrosion process (Ea, ΔH* and ΔS*) were also calculated from the corrosion rates obtained from temperature studies. Tafel plot analysis revealed that A9Y5GPA acts as a mixed-type inhibitor. A probable inhibition mechanism was also proposed. Surface morphology of the carbon steel specimens in the presence and absence of the inhibitor was evaluated by SEM analysis.

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New phosphonate based corrosion inhibitors for mild steel in hydrochloric acid useful for industrial pickling processes: experimental and theoretical approach

New Journal of Chemistry ◽

10.1039/c7nj01431g ◽

2017 ◽

Vol 41 (21) ◽

pp. 13114-13129 ◽

Cited By ~ 33

Author(s):

Neeraj Kumar Gupta ◽

Chandrabhan Verma ◽

R. Salghi ◽

H. Lgaz ◽

A. K. Mukherjee ◽

...

Keyword(s):

Hydrochloric Acid ◽

Mild Steel ◽

Corrosion Inhibition ◽

Theoretical Approach ◽

Corrosion Inhibitors ◽

Inhibition Efficiency ◽

Phosphorus Containing ◽

Corrosion Inhibition Efficiency

Phosphorus containing compounds have been evaluated by experimental and theoretical techniques and more than 96% corrosion inhibition efficiency was observed at 200 ppm concentration.

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