Issues »  Volume 47, Issue 11

Cobalt-Based Alloy Coating for Protecting Titanium from Hydrogen Permeation

V. A. Dekhtyarenko$^{1,2}$, T. V. Pryadko$^{1}$, V. V. Kyrylchuk$^{1}$, M. S. Nizameyev$^{1}$, V. I. Bondarchuk$^{1}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$E. O. Paton Electric Welding Institute, N.A.S. of Ukraine, 11 Kazymyr Malevych Str., UA-03150 Kyiv, Ukraine

Received: 19.06.2025; final version - 11.09.2025. Download: PDF

The microstructure and phase composition of a new-type protective coatings based on the Co–NbC system in as-deposited and annealed conditions are investigated with x-ray phase analysis and scanning electron microscopy. The coated titanium samples are annealed in a vacuum and in hydrogen atmosphere. Regardless of the atmosphere used, the protective coating is cracked during annealing, primarily due to the different coefficients of thermal expansion of the phases. An additional factor affecting this process is the decomposition of phases with a new phase formed in the coating during annealing, which is identified as aluminium oxide. As shown, the coating can withstand heating up to 500°C, but the exposure time should not exceed 20 min. Increasing the exposure time at this temperature (up to 120 min) lead to an active interaction of hydrogen with the substrate (titanium). As found out, the amount of hydrogen absorbed by the sample over the above-mentioned period of time is of ≅ 0.22 wt.% at an average rate of ≅0.0025 wt.%/min (for comparison, titanium iodide absorbs ≅ 1.40 wt.% over the same period of time).

Key words: titanium, hydrogen, cobalt-based alloy, protective coating, microstructure.

URL: https://mfint.imp.kiev.ua/en/abstract/v47/i11/1185.html

DOI: https://doi.org/10.15407/mfint.47.11.1185

PACS: 61.72.Ff, 68.37.Hk, 68.43.Mn, 68.60.Dv, 81.15.Cd, 81.40.Gh, 81.65.Kn

Citation: V. A. Dekhtyarenko, T. V. Pryadko, V. V. Kyrylchuk, M. S. Nizameyev, and V. I. Bondarchuk, Cobalt-Based Alloy Coating for Protecting Titanium from Hydrogen Permeation, Metallofiz. Noveishie Tekhnol., 47, No. 11: 1185–1198 (2025)

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