tailieunhanh - Studies using extracts of green tea as a corrosion inhibitor for CT38 steel in 0.01m HCL solution

The corrosion inhibition of mild steel in HCl acid solution by water extract of Green tea has been studied using electrochemical method. The results of the study reveal that the inhibition efficiency of the extract is found to vary with concentration and period of immersion. Thermodynamic consideration reveals that adsorption of Green tea extract on mild steel surface is spontaneous and occurs according to Langmuir adsorption isotherm. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor from the values of some kinetic and thermodynamic parameters. | Trương Thị Thảo và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 135(05): 179 - 183 STUDIES USING EXTRACTS OF GREEN TEA AS A CORROSION INHIBITOR FOR CT38 STEEL IN HCL SOLUTION Truong Thi Thao1*, Pham Thi Hien Luong1, Tran Quoc Toan2 1 College of Sciences – TNU, 1College of Education - TNU SUMMARY The corrosion inhibition of mild steel in HCl acid solution by water extract of Green tea has been studied using electrochemical method. The results of the study reveal that the inhibition efficiency of the extract is found to vary with concentration and period of immersion. Thermodynamic consideration reveals that adsorption of Green tea extract on mild steel surface is spontaneous and occurs according to Langmuir adsorption isotherm. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor from the values of some kinetic and thermodynamic parameters. Key words: Corrosion inhibition, mild steel, Langmuir adsorption isotherm, physical adsorption, green tea INTRODUCTION* Using inhibitors to minimize the corrosion rate for metals is a quite simple method but effectively. Searching Green corrosion inhibitors to replace inhibiting substances which are toxic to humans and the environment is one of particular concern. Green corrosion inhibitors are biodegradable and do not contain heavy metals or other toxic compounds. The successful uses of naturally occurring substances to inhibit the corrosion of metals in acidic environment have been reported by some research groups [1-7] but the application of green tea for this purpose has not been investigated much yet. Green tea contains many kinds of polyphenol promising electrochemical performance as well as the ability to inhibit corrosion of metal. This research concentrates on the inhibitive of water extract of green tea for the corrosion of mild steel in HCl solution. EXPERIMENTAL Extraction of plant Leaves of Green tea were collected in Phuc Xuan ward, Thai Nguyen city. The clean airdried .

• Vật lý
• Studies using extracts of green tea
• A corrosion inhibitor
• Langmuir adsorption isotherm
• The corrosion inhibition
• The values of some kinetic and thermodynamic parameters