Browsing by Author "Mutasingwa, James"

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    The potential of aloe secundiflora extracts as green corrosion inhibitors for carbon steel in fresh water
    (University of Dar es Salaam, 2015) Mutasingwa, James
    The present study endeavored to investigate the potential of Aloe secundiflora extracts in addressing corrosion challenges that face fresh water distribution networks. Despite others efforts to research on this problem, to the best of our knowledge, this research work is the first attempt in trying to investigate the inhibition performance of the plant extracts against corrosion of carbon steel in fresh water media. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization were the key electrochemical techniques that were utilized in all corrosion inhibition investigations. Vacuum liquid chromatography (VLC) technique was employed in a number of extraction and isolation procedures. Both EIS and VLC techniques revealed an extract abbreviated as ASEF4 being the best corrosion inhibitor among the collected and tested fractions. In addition, FT-IR as well as GCMS techniques were also employed in other deeper analysis of ASEF4. Results showed significant corrosion inhibition efficiency of 98% which tend to drop to 88% when an optimum inhibitor concentration of 200 ppm was employed in rotating systems. The inhibition mechanism was interpreted in terms of electrostatic adsorption of ASEF4 on the tested substrate according to Temkin adsorption isotherm. FT-IR and GCMS analysis of ASEF4 suggest benzene-1,2-dicarboxylic acid to be the likely compound behind the reported corrosion inhibition. Conclusively, findings from this research work have revealed quite promising results. ASEF4 has shown to be the potential corrosion inhibitor for carbon steel in aerated fresh water solutions.