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Enhanced corrosion resistance of stainless steel type 316 in sulphuricacid solution using eco-friendly waste product

Sanni, O. and Popoola, A. P. I. and Fayomi, O. S. I (2018) Enhanced corrosion resistance of stainless steel type 316 in sulphuricacid solution using eco-friendly waste product. Results in Physics (9). pp. 225-230.

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Literature has shown that different organic compounds are effective corrosion inhibitors for metal inacidic environments. Such compounds usually contain oxygen, nitrogen or sulphur and function throughadsorption on the metal surface, thereby creating a barrier for corrosion attack. Unfortunately, theseorganic compounds are toxic, scarce and expensive. Therefore, plants, natural product and natural oilshave been posed as cheap, environmentally acceptable, abundant, readily available and effective mole-cules having low environmental impact. The corrosion resistance of austenitic stainless steel Type 316in the presence of eco-friendly waste product was studied using weight loss and potentiodynamic polar-ization techniques in 0.5 M H2SO4. The corrosion rate and corrosion potential of the steel was signifi-cantly altered by the studied inhibitor. Results show that increase in concentration of the inhibitorhinders the formation of the passive film. Experimental observation shows that its pitting potentialdepends on the concentration of the inhibitor in the acid solution due to adsorption of anions at the metalfilm interface. The presence of egg shell powder had a strong influence on the corrosion resistance ofstainless steel Type 316 with highest inhibition efficiency of 94.74% from weight loss analysis, this isas a result of electrochemical action and inhibition of the steel by the ionized molecules of the inhibitingcompound which influenced the mechanism of the redox reactions responsible for corrosion and surfacedeterioration. Inhibitor adsorption fits the Langmuir isotherm model. The two methods employed for thecorrosion assessment were in good agreement

Item Type: Article
Uncontrolled Keywords: Stainless steelPitting corrosionInhibitionSulphuric acid Polarization
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 31 Aug 2020 10:11
Last Modified: 31 Aug 2020 10:11

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