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Valorization of Phosphate Sludge: Synthesis of Anti-corrosion Pigments, Physicochemical Study and Application to the Protection of Mild Steel in a 3% NaCl Medium

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Abstract

The aim of this work is to develop a pigment basing on phosphate washing sludge to valorise this wastes as an environmentally friendly corrosion inhibitor for mild steel in chloride medium. For this purpose, potassium zinc phosphate (PZPb) was synthesized from Moroccan phosphate sludge (PS) using the dissolution–precipitation method and ZnCl2 and KOH chemical precursors. The chemical profile of the resulting compound was analysed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The synthesized pigment is a mixture of zinc phosphate and zinc potassium phosphate phases. The inhibitory performance of PZPb was investigated and compared to potassium phosphate inhibitor synthesized using commercial phosphoric acid (PZPc). The corrosion study was achieved on mild steel in a 3% NaCl aqueous solution by means of electrochemical impedance spectroscopy (EIS) and linear polarization (LPR). Results obtained showed high inhibitive efficiency and similar behaviour of PZPb pigment in comparison with PZPc one. Electrochemical data and surface analysis, including DRX and MEB-EDS indicate that the elaborated pigment acts by reinforcing the protective properties of steel corrosion products. Thus, the pseudo protective layer formed consists of an iron oxi-hydroxide layer doped with iron zinc phosphate phases. These latest were found to be firmly bound to the oxide layer and uniformly distributed throughout the layer pores.

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Authors and Affiliations

  1. Materials and Interfacial Systems Laboratory, FS, Abdelmalek Essaâdi University, Tétouan, Morocco

    M. Elmourabit, I. Allaoui, F. Chaouket, K. Draoui, I. Raissouni & D. Bouchta

  2. Laboratory of Applied Sciences and Didactics, ENS, Abdelmalek Essaâdi University, Tétouan, Morocco

    A. Ait Aghzzaf

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  1. M. Elmourabit
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  2. I. Allaoui
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Correspondence to M. Elmourabit.

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I hereby declare that: There are no known conflicts of interest associated with this publication. There has been no significant financial support for this work that could affect the presentation of data in an objective way. The manuscript has been approved by all named authors. Authors have given due consideration to the protection of intellectual property associated with this work and that there are no obstacles to publication, including the timing of publication. Authors have followed the regulations of our institutions concerning intellectual property.

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Elmourabit, M., Allaoui, I., Chaouket, F. et al. Valorization of Phosphate Sludge: Synthesis of Anti-corrosion Pigments, Physicochemical Study and Application to the Protection of Mild Steel in a 3% NaCl Medium. Waste Biomass Valor 14, 4045–4060 (2023). https://doi.org/10.1007/s12649-023-02034-6

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