Influence of Post−Deposition Heat Treatment on the Properties of Electrodeposited Ni−Mo Alloy Coatings

Agnieszka Laszczyńska , Włodzimierz Tylus , Bogdan Szczygieł , Irena Szczygieł

Abstract

Ni−26 wt% Mo alloy coatings were annealed for 1 h in an air atmosphere at temperatures of 200, 400 and 600 °C. The influence of heat treatment on the structure and the mechanical and corrosion properties was investigated. It was found that the coating microhardness increased significantly after annealing at 200 and 400 °C. The results of the scratch test revealed that. Ni−Mo alloys heated at higher temperatures (400 and 600 °C) were characterized by lower adhesion and more brittle nature in comparison to the as−deposited coating and the coating heated at 200 °C. Annealing at 400 °C led to a significant improvement of corrosion resistance of the coating. This was the consequence of an increase in the thickness of an oxide layer formed on the coating surface. When exposed to a corrosive solution, the protective ability of the oxide layer deteriorated, which was followed by a systematic drop of polarization, charge transfer, and pore resistance. XPS analysis revealed that the surface layer of the as−deposited coating and the coating heated at 200 °C was mainly composed of NiOOH and Ni(OH)2 and contained higher amounts of Mo in comparison to the deposit bulk. The surface layer of coatings heated at higher temperatures was composed of NiO and contained only small amounts of Mo.
Author Agnieszka Laszczyńska (EaE / IChaFT / DNCh)
Agnieszka Laszczyńska,,
- Department of Non-organic Chemistry
, Włodzimierz Tylus - Wrocław University of Science and Technology (PWr)
Włodzimierz Tylus,,
-
, Bogdan Szczygieł - Wrocław University of Science and Technology (PWr)
Bogdan Szczygieł,,
-
, Irena Szczygieł (EaE / IChaFT / DNCh)
Irena Szczygieł,,
- Department of Non-organic Chemistry
Journal seriesApplied Surface Science, ISSN 0169-4332, e-ISSN 1873-5584, (A 35 pkt)
Issue year2018
Vol462
Pages432-443
Publication size in sheets0.55
Keywords in EnglishElectrodeposited Ni−Mo alloy, Heat Treatment, Micromechanical Properties, Corrosion Properties, XPS
ASJC Classification2508 Surfaces, Coatings and Films
DOIDOI:10.1016/j.apsusc.2018.08.160
Languageen angielski
File
Laszczynska_Tylus_Szczygiel_Szczygiel_Influence_Of_Post_Deposition_Heat.pdf 4,2 MB
Score (nominal)35
Score sourcejournalList
Publication indicators Scopus Citations = 2; WoS Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.326; WoS Impact Factor: 2018 = 5.155 (2) - 2018=4.281 (5)
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