Influence of temperature and Azithromycin on the surface of SS 316L in a KOH solution

• Basori^1,2, W.M.F.W. Mohamad^2,3, N. Tamaldin^2,3, M.R. Mansor^2,3, M.K. Ajiriyanto⁴, S.D. Yudanto⁵ and F.B. Susetyo⁶

¹ Department of Mechanical Engineering, Universitas Nasional, Sawo Manila Street No. 61, Pasar Minggu, Jakarta, 12520, Indonesia
² Fakulti Kejuruteraan Mekanikal, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia
³ Centre for Advanced Research on Energy, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia
⁴ Research Center for Nuclear Fuel Cycle and Radioactive Waste Technology – National Research and Innovation Agency, KST B.J. Habibie, Tangerang Selatan, Banten, 15314, Indonesia
⁵ Research Center for Metallurgy – National Research and Innovation Agency, KST B.J. Habibie, Tangerang Selatan, Banten, 15314, Indonesia
⁶ Department of Mechanical Engineering, Universitas Negeri Jakarta, Rawamangun Muka Street, Rawamangun, Jakarta, 13220, Indonesia

Abstract: This study deals with the effect of temperature and azithromycin on the corrosion rate and remaining life of SS 316L used as an electrode for HHO gas production. The OCP measurement results are shown that the samples in the presence of azithromycin are nobler due to a more protective layer on the surface of the samples and promote a lower corrosion rate. Potentiodynamic polarization tests were performed in a KOH solution at various temperatures and azithromycin concentrations. The results show that increasing the temperature results in an increase in the corrosion rate, while azithromycin has the potential to inhibit corrosion. Increasing the concentration of azithromycin could increase inhibitor efficiency at various temperatures. Moreover, in the presence of azithromycin, the E_corr variation is less than ±85 mV, indicating that azithromycin is a mixed inhibitor. The adsorption process of azithromycin onto the SS 316L surface is spontaneous, exothermic, and physical, and follows the Freundlich isotherm. Characterizations of the samples using a potentiostat, a scanning electron microscope equipped with an energy dispersion spectroscope, and X-ray diffraction showed that the increase in temperature changes the surface morphology and shows the formation of Cr₂O₃ compounds. In conclusion, azithromycin could be implemented in a KOH solution for HHO gas production.

Keywords: stainless steel, alkaline solution, corrosion, inhibition

Int. J. Corros. Scale Inhib., 2023, 12, no. 1, 258-274
doi: 10.17675/2305-6894-2023-12-1-15

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