Corrosion inhibition of A516 carbon steel in 0.5 M HCl solution using Arthrospira platensis extract as green inhibitor

• B. Anwar, T. Khairunnisa and Y. Sunarya

Chemistry Department, Universitas Pendidikan Indonesia, Bandung, 40514 Indonesia

Abstract: The study on the influence of Arthrospira platensis extract as a corrosion inhibitor on A516 carbon steel in 0.5 M HCl solution has been conducted. The extract was obtained by the maceration method and characterized by phytochemical analysis and infrared spectroscopy. The effect of corrosion inhibition of A. platensis extract was studied by weight loss method, electrochemical impedance spectroscopic measurements and scanning electron microscopy. The dosage of A. platensis extract was varied between 100 to 250 ppm. The results of phytochemical and FTIR analysis show that the extract of A. platensis revealed the presence of saponin, steroid and alkaloid compounds, along with hydroxyl, carbonyl, amine, and carboxylic groups, which are responsible for the adsorption on the carbon steel surface. The extract of A. platensis showed good performance at a dose of 250 ppm with inhibition efficiency of 66% at 298 K. The charge transfer resistance increases from 82 Ω·cm² to 246 Ω·cm² in the electrochemical impedance spectrum after the addition of 250 ppm A. platensis extract. The adsorption of this extract on the surface of A516 carbon steel obeys the Langmuir isotherm. Thermodynamic parameter of adsorption allows us to suggest the adsorption process was dominated by physical adsorption. SEM analysis supported the inhibitive action of the A. platensis extract against the carbon steel corrosion in acid media.

Keywords: carbon steel, corrosion, green inhibitors, Arthrospira platensis, microalgae

Int. J. Corros. Scale Inhib., 2020, 9, no. 1, 244-256 PDF (801 K)
doi: 10.17675/2305-6894-2020-9-1-15

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