Publication: The Role of Cassava Leaf Extract as Green Inhibitor for Controlling Corrosion and Scale Problems in Cooling Water Systems
Issued Date
2021-06-01
Resource Type
ISSN
18641245
15477029
15477029
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2-s2.0-85101019036
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Failure Analysis and Prevention. Vol.21, No.3 (2021), 847-860
Suggested Citation
Jaruwit Lohitkarn, Pattamaporn Hemwech, Rattikan Chantiwas, Manthana Jariyaboon The Role of Cassava Leaf Extract as Green Inhibitor for Controlling Corrosion and Scale Problems in Cooling Water Systems. Journal of Failure Analysis and Prevention. Vol.21, No.3 (2021), 847-860. doi:10.1007/s11668-021-01121-x Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76949
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Title
The Role of Cassava Leaf Extract as Green Inhibitor for Controlling Corrosion and Scale Problems in Cooling Water Systems
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Abstract
The addition of synthetic corrosion and scale inhibitors in a recirculating cooling water system is a well-known method to defeat corrosion and scale problems. In this work, we utilize the extract from cassava leaf, which is agricultural waste in Thailand as a green inhibitor. Corrosion inhibition efficiency with using cassava leaf extract (CLE) for mild carbon steel was investigated in a simulated cooling water solution under both stagnant and hydrodynamic conditions. A mock-up of a recirculating cooling water system was custom-built to imitate the hydrodynamic conditions used in industry. Effects of CLE concentration (0, 50, 100, 200, 400, 600, and 800 ppm) and temperature (35 °C, 45 °C, and 55 °C) on corrosion inhibition efficiency were investigated. Increasing the CLE concentration increased its inhibition efficiency. In the case of stagnant conditions, the CLE showed a corrosion inhibition efficiency of 97.4% with 800 ppm CLE at 35 °C. The CLE performed as an anodic inhibitor. A decrease in inhibition efficiency was observed when the temperature was increased. For the hydrodynamic conditions with a flow rate of 34 L min−1 at 55 °C, a corrosion inhibition efficiency of 75.7% was seen with 200 ppm CLE. A scale inhibition efficiency of the CLE was investigated at concentrations of 0, 200, 800, and 2000 ppm. A 76.1% CaCO3 scale inhibition efficiency was obtained with 2000 ppm CLE. A change in the CaCO3 morphology due to the adsorption of the CLE inhibited scale formation.