Plant‐Derived Nanoparticles for Advanced Ni–P–TiO 2 Composite Coatings on AH36 Marine Steel

Plant‐Derived Nanoparticles for Advanced Ni–P–TiO 2 Composite Coatings on AH36 Marine Steel Ganta Suresh Department of Mechanical Engineering Vels Institute of Science Technology and Advanced Studies P.V. Vaithiyalingam Road Chennai Tamil Nadu India https://orcid.org/0009-0007-6849-4819 T. Vinod Kumar Department of Mechanical Engineering Vels Institute of Science Technology and Advanced Studies P.V. Vaithiyalingam Road Chennai Tamil Nadu India https://orcid.org/0000-0002-3015-1008 R. Muraliraja Department of Mechanical Engineering Vels Institute of Science Technology and Advanced Studies P.V. Vaithiyalingam Road Chennai Tamil Nadu India https://orcid.org/0000-0002-5691-9257 A. Padmapriya Department of Chemistry, School of Arts and Science Vinayaka Mission's Research Foundation (DU), Chennai Campus Paiyanoor Chennai Tamil Nadu India https://orcid.org/0000-0002-8887-8218 J. Rajasekar Department of Mechanical Engineering Sri Ganesh College of Engineering and Technology Puducherry India https://orcid.org/0000-0001-7874-4593 S. Arunkumar Department of Mechanical Engineering Vels Institute of Science Technology and Advanced Studies P.V. Vaithiyalingam Road Chennai Tamil Nadu India ABSTRACT

The synthesis of electroless Ni–P–TiO 2 composite coatings on marine grade AH36 steel was done using plant‐extract‐derived titanium dioxide nanoparticles in the present work. TiO 2 nanoparticles were synthesized using Indigofera tinctoria extract as an efficient reducing and capping agent by the green method. Anatase, rutile, and amorphous polymorphs were obtained by controlled temperature calcinations and characterized using scanning electron microscopy (SEM) and X‐ray diffraction (XRD). They were then dispersed in a premixed bath of electroless Ni–P (including sodium hypophosphite, ammonium chloride, and sodium tri‐citrate) with the zwitterionic surfactant for enhanced particle dispersion. One hybrid composite and three single‐phase TiO 2 composites with different contents were coated at 85°C for 1 h. The coated samples presented a homogeneous structure in sizes of grain with apparent improvement in microhardness and improved corrosion resistance. A higher TiO 2 ‐added composite coating shows well‐defined surface features, as well as superior electrochemical performance. Thickness of the coating was correlated with the phase and elemental composition of particles. The Tafel test showed a marked reduction in the corrosion current density and an increase of anti‐corrosion for marine environments. It can be presumed that the green synthesis of Ni–P–TiO 2 is a multilayer, promising economical and environment‐friendly approach for enhancing the corrosion resistance and durability of AH36 marine steel.
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