Enhanced resistance to corrosion and hydrogen permeation due to tungsten partitioning induced phase and strain evolution in electrodeposited cobalt-tungsten coatings

Kumar, GM and Singh, AP and Godha, A and Yadav, A and Srivastava, C (2024) Enhanced resistance to corrosion and hydrogen permeation due to tungsten partitioning induced phase and strain evolution in electrodeposited cobalt-tungsten coatings. In: Materialia, 33 .

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Abstract

The study focused on the electrochemical behaviour and hydrogen permeation of electrodeposited Co-W coatings with varying tungsten compositions. The coating with highest tungsten content (13 wt) exhibited W-enriched nanoclusters, promoting galvanic coupling and reducing corrosion resistance. The tensile strain around these coherent clusters provided pathways for hydrogen to escape, increasing permeation rates. In contrast, the 6 wt W coating exhibited superior corrosion resistance due to a favourable low-energy texture and forming stable oxides in corrosive environment. In this coating tungsten distributed in the solid solution and it has larger atomic size, created compressive fields hindering hydrogen pathways, enhancing resistance to permeation. © 2024 Acta Materialia Inc.

Item Type:	Journal Article
Publication:	Materialia
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Authors.
Keywords:	Binary alloys; Cobalt; Corrosion resistant coatings; Electrodeposition; Electrodes; Galvanic corrosion; Hydrogen; Permeation; Tensile strain; Textures; Tungsten, Clusterings; Co-W coating; Electrochemical behaviors; Electrodeposited cobalt; Hydrogen permeation; Phase evolutions; Strain evolution; Tungsten coating; Tungsten content; W coating, Corrosion resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	23 Apr 2024 05:43
Last Modified:	23 Apr 2024 05:43
URI:	https://eprints.iisc.ac.in/id/eprint/84656

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