Corrosion protection of XC70 mild steel by a Ni–Co/TiO₂ composite coating in an acidic chloride environment
Abstract
In this study, the corrosion behavior of XC70 steel in a 0.5 M HCl acidic medium was investigated using Ni-Co/TiO₂ composite coatings prepared by electrodeposition. The corrosion resistance of bare steel, Ni-Co alloy coating, and Ni-Co/TiO2 nanocomposite coatings deposited with various TiO2 concentrations in the bath, was investigated using weight loss measurements and electrochemical techniques. Surface characterization, adhesions tests, and microhardness measurements were also performed. Gravimetric and electrochemical results revealed a significant improvement in corrosion resistance with increasing TiO₂ content up to an optimal 0.64%. At this concentration, the corrosion current density decreased from 376 µA•cm⁻² for the Ni-Co alloy to 67 µA•cm⁻² for the Ni-Co/TiO₂ coating. Electrochemical impedance spectroscopy results confirmed the improved corrosion resistance through an increase in charge transfer resistance (Rct ) and a decrease in the constant phase element (CPE). Overall, the Ni-Co/TiO₂ (0.64%) nanocomposite exhibits the best overall performance, attributed to the uniform incorporation of TiO₂ nanoparticles within the Ni-Co matrix, leading to coating densification, and reduced electrolyte penetration.
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BibTeX
@article{nasri2026corrosion,
title = {{Corrosion protection of XC70 mild steel by a Ni–Co/TiO₂ composite coating in an acidic chloride environment}},
author = {Katia Nasri and Nadia Ait Ahmed and Hamida Kermoune Issaadi and Amor Azizi and Nabila Aliouane and Atmane Djermoune and Carine Chassigneux and Marielle Eyraud},
journal = {Environmental Science and Pollution Research},
year = {2026},
month = oct,
doi = {10.1007/s11356-026-38068-1},
url = {https://hal.science/hal-05794564v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Corrosion protection of XC70 mild steel by a Ni–Co/TiO₂ composite coating in an acidic chloride environment
AU - Katia Nasri
AU - Nadia Ait Ahmed
AU - Hamida Kermoune Issaadi
AU - Amor Azizi
AU - Nabila Aliouane
AU - Atmane Djermoune
AU - Carine Chassigneux
AU - Marielle Eyraud
PY - 2026
DA - 2026/10/12
JO - Environmental Science and Pollution Research
DO - 10.1007/s11356-026-38068-1
UR - https://hal.science/hal-05794564v1
AB - In this study, the corrosion behavior of XC70 steel in a 0.5 M HCl acidic medium was investigated using Ni-Co/TiO₂ composite coatings prepared by electrodeposition. The corrosion resistance of bare steel, Ni-Co alloy coating, and Ni-Co/TiO2 nanocomposite coatings deposited with various TiO2 concentrations in the bath, was investigated using weight loss measurements and electrochemical techniques. Surface characterization, adhesions tests, and microhardness measurements were also performed. Gravimetric and electrochemical results revealed a significant improvement in corrosion resistance with increasing TiO₂ content up to an optimal 0.64%. At this concentration, the corrosion current density decreased from 376 µA•cm⁻² for the Ni-Co alloy to 67 µA•cm⁻² for the Ni-Co/TiO₂ coating. Electrochemical impedance spectroscopy results confirmed the improved corrosion resistance through an increase in charge transfer resistance (Rct ) and a decrease in the constant phase element (CPE). Overall, the Ni-Co/TiO₂ (0.64%) nanocomposite exhibits the best overall performance, attributed to the uniform incorporation of TiO₂ nanoparticles within the Ni-Co matrix, leading to coating densification, and reduced electrolyte penetration.
SN - 0944-1344
SN - 1614-7499
ER -