We analyze the effect of different temperature-time conditions of the process of annealing applied to electroless Ni–P (12 wt.% P) coatings in order to improve their corrosion resistance in a 3.5% NaCl solution. A process of annealing at 400°C for 4 h applied to Ni–P electroless coatings (12 wt.% P) induces the crystallization of the coating accompanied by the formation of stable Ni3P and Ni phases. This Ni–P crystalline coating presents better corrosion resistance in the 3.5 wt.% NaCl solution than the amorphous alloy and the coatings annealed at 400 and 500°C for 1 and 2 h. The corrosion resistance of the Ni–P coatings is evaluated by the method of electrochemical impedance spectroscopy for 4 h of immersion. The microstructure of the Ni–P coatings prior to and after annealing at 400 and 500°C for 1, 2, and 4 h is studied by X-ray diffraction (XRD) and scanning-electron microscopy. The procedure of annealing at 400°C for 4 h induces the preferential orientation of the plane (112) of the Ni3P phase, as shown by the XRD analysis, which modifies the kinetics of the electrochemical reactions. The corrosion resistance of the Ni–P coatings annealed at 400°C for 4 h is related to the formation of the texturized Ni3P phase, which is chemically stable and comprises 80% of the coating volume.
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Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 58, No. 1, pp. 5–14, January–February, 2022.
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Dzib-Pérez, L., Bilyy, O., Leon-Gronimo, A. et al. Effect of the Time-Temperature Conditions of Annealing on the Corrosion Resistance of Electroless Ni–P Coatings. Mater Sci 58, 1–11 (2022). https://doi.org/10.1007/s11003-022-00623-9
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DOI: https://doi.org/10.1007/s11003-022-00623-9