Abstract
The aim of this research is to evaluate the inhibitive effect of metolazone on API 5L X-52 steel in 2 M HCl solution using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization techniques within a temperature range of 303 to 323 K. Scanning electron microscopy (SEM) was also employed to study the morphology of the corroded coupons in 2 M HCl solution and in the presence of the inhibitor. The efficiency of the inhibition depends on the concentration of metolazone and reaction system temperature. The maximum inhibition efficiency values were 92.7 and 90.7%, respectively, for both EIS and polarization techniques at the temperature of 303 K. The electrochemical impedance spectra (EIS) studies reveal that the process of inhibition is through charge transfer. Potentiodynamic polarization (PDP) studies showed that metolazone is mixed-type inhibitor. The metolazone adsorption characteristics on API 5L X-52 steel surface was found to be spontaneous and obeyed Langmuir adsorption isotherm and the mechanism of adsorption suggest chemisorptions. The inhibition efficiency of metolazone drug obtained by electrochemical methods was in good relationship with each other.
 
 KEY WORDS: Metolazone drug, API 5L X-52 Steel, SEM, Electrochemical, Corrosion inhibition
 
 Bull. Chem. Soc. Ethiop. 2020, 34(2), 407-418
 DOI: https://dx.doi.org/10.4314/bcse.v34i2.16
Highlights
The application of metals and alloys are of great interest in industrial installations and equipment
The electrochemical impedance spectroscopy was performed to investigate the effect of the inhibitor concentration on the impedance behavior of API 5L X-52 steel in 2 M HCl solution
Increasing the concentration of metolazone drug increases the diameter of the circle from 50 to 500 mg/L, which suggests an increase in the inhibitory effect
Summary
The application of metals and alloys are of great interest in industrial installations and equipment. The crust is the result of mineral precipitation which is derived from the water formation produced along with the oil and gas [2]. This type of steel is easy to be corroded in acidic environment. Corrosion inhibitor is define as chemical substances that when added in a small concentration to corrosive environment where metals and alloys reside decreases the rate of attack on the metal surface. These chemical substances may be costly and not friendly.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
