Influence of Microstructure of Titanium Alloys Produced with Powder Technology on Their Corrosion Resistance in Acid Environments

Issues » Volume 42, Issue 10

D. G. Savvakin$^{1}$, O. O. Stasiuk$^{1}$, I. M. Pohrelyuk$^{2}$, K. S. Shlyakhetka$^{2}$, O. V. Ovchinnikov$^{3}$, S. M. Tkachenko$^{3}$, O. V. Osypenko$^{4}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$G. V. Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5 Naukova Str., UA-79060 Lviv, Ukraine
$^{3}$Zaporizhzhia Polytechnic National University, 64 Zhukovsky Str., UA-69063 Zaporizhzhya, Ukraine
$^{4}$Zaporizhzhya Titanium&Magnesium Combine’, 18 Teplychna Str., UA-69600 Zaporizhzhya, Ukraine

Received: 22.06.2020. Download: PDF

Corrosion characteristics of commercially pure Ti and Ti–6Al–4V alloy manufactured with press-and-sinter powder metallurgy are studied in HCl and H$_2$SO$_4$ water solutions with acid concentrations up to 80%. Changing of powder metallurgy processing parameters (powder size, compaction and vacuum sintering regimes) results in a number of structural conditions of produced materials with different residual porosity (1 to 5%) and grain sizes. As shown, the residual porosity of sintered titanium alloys is a key microstructure factor affecting corrosion resistance. Increase in total porosity and pore sizes leads to higher corrosion rate, while decreased porosity (1–2%) and minimized pore size is useful for improvement of corrosion characteristics. Optimization of material microstructure provides corrosion resistance of produced titanium-based materials sufficient for practice application in aggressive environments at chemical industries.

Key words: titanium alloys, powders, pores, microstructure, acid environment, corrosion resistance.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i10/1347.html

DOI: https://doi.org/10.15407/mfint.42.10.1347

PACS: 61.72.Qq, 81.20.Ev, 81.65.Kn, 82.45.Bb

Citation: D. G. Savvakin, O. O. Stasiuk, I. M. Pohrelyuk, K. S. Shlyakhetka, O. V. Ovchinnikov, S. M. Tkachenko, and O. V. Osypenko, Influence of Microstructure of Titanium Alloys Produced with Powder Technology on Their Corrosion Resistance in Acid Environments, Metallofiz. Noveishie Tekhnol., 42, No. 10: 1347—1362 (2020) (in Ukrainian)

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