Author: EDELMIRA RODRIGUEZ CLEMENTE

Hexane Extract of Allium sativum as a Corrosion Inhibitor for Carbon Steel in 0.5 M H2SO4

EDELMIRA RODRIGUEZ CLEMENTE MARIA GUADALUPE VALLADARES CISNEROS JONATHAN GABRIEL RAMIREZ ARTEAGA JOSE GUADALUPE CHACON NAVA (2014)

The corrosion inhibition of 1018 carbon steel in 0.5 M H2SO4 was conducted by

using an organic extract of natural origin. The evaluation corrosion inhibition activity of

hexane extract of Allium sativum was carried out by electrochemical tests such as

polarization curves and electrochemical impedance spectroscopy. Different

temperatures were employed room temperature, 40° and 60° C. The inhibitor

concentrations were 0, 50, 100, 200, 400, 600 and 800 ppm. The organic extract acts

as corrosion inhibitor mixed and efficiency of corrosion inhibition increases linearly

concentration, the major efficiency of corrosion inhibition was up 90 percent used 400

ppm of A. sativum extract at room temperature. The efficiency corrosion inhibition is

affected by temperature increased.

Conference proceedings

Allium sativum acid corrosion BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA FÍSICA OTRAS

GREEN CORROSION INHIBITIONS FOR 1045 AND 1080 CARBON STEELS BY GARLIC IN DYNAMIC CONDITIONS FOR IN SULPHURIC ACID MEDIA

EDELMIRA RODRIGUEZ CLEMENTE AMERICA MARIA RAMIREZ ARTEAGA MANUEL EDUARDO PALOMAR PARDAVE JOSE GUADALUPE CHACON NAVA (2015)

Abstract

Previous studies showed the adequate efficiency of green corrosion inhibition of 1018

carbon steel in 0.5 M H2SO4 by garlic extract (Allium sativum) in static conditions at 25 °C.

In this condition, the inhibition efficiency was 95 % at 400 ppm. Another study under

similar conditions, showed an inhibition efficiency of 80% for 1045 steel (with 800 ppm

inhibitor) and 70% for 1080 steel (with 400 ppm inhibitor). Here, the effect of dynamic

conditions in the corrosion inhibition by garlic extract for these steels exposed in 0.5 M

H2SO4 at 25 °C was investigated. In order to investigate the effect of dynamic conditions, a

rotating cylinder electrode was used at 0, 250, 500, 1000 and 2000 rpm. The inhibitor

efficiency was obtained by potentiodynamic polarization measurements and spectroscopy

electrochemical impedance. The results indicated that the green inhibitor efficiency

behaves somewhat different for both carbon steels in particular at 2000 rpm. In this

condition, the inhibition efficiency was 77% for the 1080 carbon steel and 95 % for the

1045 carbon steel. According to the electrochemical tests in the present work, it seems that

the garlic extract acts for both steels as a mixed type green inhibitor. This research shows

that the garlic extract is a good candidate as a green inhibitor to be used in new possible

environmental friendly corrosion inhibitor formulations

Conference proceedings

Allium sativum garlic BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA FÍSICA OTRAS