Effect of annealing time-temperature conditions on the corrosion resistance of electroless Ni–P coatings

Keywords

Ni–P coatings, electroless deposition, heat treatment, annealing, corrosion resistance, texture, microstructure, Ni₃P phase.

Cite as

Dzib-Perez L., Bilyy O., Leon-Gronimo A., Castano-Gonzalez J. G., Guintana P., Dominguuez-Maldonado R., and Gonzalez-Sanchez J. Effect of annealing time-temperature conditions on the corrosion resistance of electroless Ni–P coatings. Physico­chemical Mechanics of Materials. 2022. 58(1), 048-055.

Abstract

The purpose of this work is to analyze the effect of different annealing temperature-time processing conditions applied to electroless Ni–P (12 wt.% P) coatings to improve the corrosion resistance in a 3.5% NaCl solution. An annealing process at 400°C for 4 h applied to electroless Ni–P coatings (12 wt.% P) induces the crystallization of the coating with the formation of stable Ni₃P and Ni phases. This crystalline Ni–P 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 electrochemical impedance spectroscopy for 4 h of immersion. The microstructure of the Ni–P coatings before 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. Annealing at 400°C for 4 h induces the preferential orientation of the plane (112) of the Ni₃P phase as revealed by 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 texturized Ni₃P phase which is chemically stable and comprises 80% of the coating volume.

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