Improvement of corrosion resistance of 316L stainless steel substrate with a composite coating of biopolymer produced by electrophoretic deposition

• N.A. Al-Ali¹, M.H. Abdulkareem¹, I.A. Anoon¹ and A.A. Al-Amiery^2,3

¹ Department of Production Engineering and Metallurgy, University of Technology (UOT), Al Sina’a Street, Baghdad 10066, Iraq
² Energy and Renewable Energies Technology Center, University of Technology, Baghdad 10001, Iraq
³ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia (UKM), Bangi, P.O. Box 43000, Selangor, Malaysia

Abstract: In this study, the problem of corrosion in 316L stainless steel metal implants is addressed by electrophoretically depositing composite biopolymer coatings. The composite coatings consist of a layer of chitosan with gelatin, deposited under specific parameters including a gelatin concentration of 3 g/L, chitosan concentration of 0.5 g/L, voltage of 20 V, and deposition time of 3 minutes. The stability of the suspensions was evaluated using the zeta potential test, which indicated good stability. The zeta potential for gelatin in the chitosan suspension was measured at 77.83 mV at pH 4.8, while gelatin in deionized water exhibited a value of –26.81 mV. The adhesion strength between the composite coatings and the 316L stainless steel substrate was determined using the Tape test, resulting in a removal area of the biopolymer composite coating of 8.06%. Wettability tests were conducted to evaluate the interaction between the 316L stainless steel and the biopolymer coating layer. Scanning electron microscopy analysis revealed a homogenous and defect-free composite coating, confirming the surface topology. Furthermore, the corrosion resistance of the 316L stainless steel was observed to significantly improve with the application of the biopolymer coating.

Keywords: electrophoretic deposition, gelatin, chitosan, EPD

Int. J. Corros. Scale Inhib., 2023, 12, no. 3, 913-932
doi: 10.17675/2305-6894-2023-12-3-7

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