tailieunhanh - Báo cáo vật lý: "Electrochemical Studies of Mild Steel Corrosion Inhibition in Aqueous Solution by Uncaria gambir Extract"

Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Electrochemical Studies of Mild Steel Corrosion Inhibition in Aqueous Solution by Uncaria gambir Extract | Journal of Physical Science Vol. 21 1 1-13 2010 1 Electrochemical Studies of Mild Steel Corrosion Inhibition in Aqueous Solution by Uncaria gambir Extract Mohd. Hazwan Hussin and Mohd. Jain Kassim Material and Corrosion Chemistry Laboratory School of Chemical Sciences Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia Corresponding author Abstract The inhibition of the corrosion of mild steel in aqueous solutions by ethyl acetate extract of Uncaria gambir containing catechin has been studied using weight loss potentiodynamic polarisation measurements electrochemical impedance spectroscopy EIS and scanning electron microscope technology with energy dispersive X-ray spectroscopy SEM-EDX . Inhibition was found to be highest at a concentration of 150 ppm in solutions with a pH of 5. The results obtained show that the ethyl acetate extract of U. gambir acts as a mixed-type inhibitor and could serve as an effective corrosion inhibitor of mild steel in aqueous solution. Keywords Uncaria gambir catechin corrosion inhibitor weight loss potentiodynamic polarisation measurement Abstrak Pemerencatan kakisan besi lembut dalam larutan akueus oleh ekstrak etil asetat Uncaria gambir yang mengandungi katekin dalam larutan akueus telah dikaji dengan menggunakan kaedah kehilangan berat pengukuran potensidinamik kekutuban spektroskopi elektrokimia impedans EIS dan mikroskop elektron imbasan dengan spektroskopi sinar-X sebaran tenaga SEM-EDX . Pemerencatan tertinggi dikesan pada kepekatan 150 ppm dalam larutan pH 5. Keputusan yang diperolehi menunjukkan bahawa ekstrak etil asetat U. gambir bertindak sebagai perencat jenis campuran dan boleh bertindak sebagai perencat kakisan besi lembut yang efektif dalam larutan akueus. Kata kunci Uncaria gambir katekin perencat kakisan kehilangan berat pengukuran potensiodinamik kekutuban 1. INTRODUCTION Uncaria gambir a native Southeast Asian herbal plant can mostly be found in countries such as Indonesia and .

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