Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2024 Aug 5;17(15):3880.
doi: 10.3390/ma17153880.

Corrosion Resistance of Coatings Based on Chromium and Aluminum of Titanium Alloy Ti-6Al-4V

Tetiana Loskutova  1   2 , Michael Scheffler  2 , Ivan Pavlenko  3   4 , Kamil Zidek  4 , Inna Pohrebova  5 , Nadiia Kharchenko  6 , Iryna Smokovych  7 , Oleksandr Dudka  1 , Volodymyr Palyukh  8 , Vitalii Ivanov  9   10 , Yaroslav Kononenko  1
Affiliations

Corrosion Resistance of Coatings Based on Chromium and Aluminum of Titanium Alloy Ti-6Al-4V

Tetiana Loskutova et al. Materials (Basel). .

Abstract

Improvement of wear, corrosion, and heat-resistant properties of coatings to expand the operational capabilities of metals and alloys is an urgent problem for modern enterprises. Diffusion titanium, chromium, and aluminum-based coatings are widely used to solve this challenge. The article aims to obtain the corrosion-electrochemical properties and increase the microhardness of the obtained coatings compared with the initial Ti-6Al-4V alloy. For this purpose, corrosion resistance, massometric tests, and microstructural analysis were applied, considering various aggressive environments (acids, sodium carbonate, and hydrogen peroxide) at different concentrations, treatment temperatures, and saturation times. As a result, corrosion rates, polarization curves, and X-ray microstructures of the uncoated and coated Ti-6Al-4V titanium alloy samples were obtained. Histograms of corrosion inhibition ratio for the chromium-aluminum coatings in various environments were discussed. Overall, the microhardness of the obtained coatings was increased 2.3 times compared with the initial Ti-6Al-4V alloy. The corrosion-resistant chromaluminizing alloy in aqueous solutions of organic acids and hydrogen peroxide was recommended for practical application in conditions of exposure to titanium products.

Keywords: aluminum; chemical-thermal treatment; chromium; corrosion-resistant coating; functional layer; process innovation.

PubMed Disclaimer

Conflict of interest statement

Author Iryna Smokovych was employed by the company thyssenkrupp Materials Trading GmbH. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Microstructure (a) and distribution of elements (b) on the surface of titanium alloy Ti-6Al-4V after chromaluminizing (temperature—1050 °C; time—4 h).
Figure 2
Figure 2
X-ray diffractogram of the surface of titanium alloy Ti-6Al-4V after chromaluminizing (temperature—1050 °C; time—4 h); CuKα1 radiation, wavelength—0.154 nm.
Figure 3
Figure 3
Polarization curves for 5% aqueous solutions of sulfuric acid: 1-1′—initial Ti-6Al-4V alloy; 2-2′—Ti-6Al-4V alloy with chromium–aluminum coatings; 3-3′—pure aluminum alloy.
Figure 4
Figure 4
Polarization curves for 1.5% adipic acid solution: 1-1′—initial Ti-6Al-4V alloy; 2-2′—Ti-6Al-4V alloy with chromium–aluminum coatings; 3-3′—pure aluminum alloy.
Figure 5
Figure 5
Polarization curves for a 12% hydrogen peroxide solution: 1-1′—initial Ti-6Al-4V alloy; 2-2′—Ti-6Al-4V alloy with chromium–aluminum coatings; 3-3′—pure aluminum alloy.
Figure 6
Figure 6
Microstructures of the uncoated (a,c,e,g,i,k) and coated Ti-6Al-4V titanium alloy samples (b,d,f,h,j,l) after corrosion: (a,b)—in 15% aqueous solution of acetic acid (CH3COOH); (c,d)—in 1.5% aqueous solution of adipic acid (C6H10O4); (e,f)—in 35% H2O2 solution; (g,h)—in 10% aqueous solution of oxalic acid (C2H2O4); (i,j)—in a 40% aqueous solution of nitric acid (HNO3); (k,l)—in 5% aqueous solution of sulfuric acid (H2SO4).
Figure 7
Figure 7
Histograms of corrosion inhibition ratio of the chromium–aluminum coatings (a) and corrosion rate of pure aluminum alloy (b) in various aggressive environments.
See this image and copyright information in PMC

References

    1. Chou W.-J., Yu G.-P., Huang J.-H. Corrosion behavior of TiN-coated 304 stainless steel. Corros. Sci. 2001;43:2023–2035. doi: 10.1016/S0010-938X(01)00010-5. - DOI
    1. Bell T. Surface engineering of austenitic stainless steel. Surf. Eng. 2002;18:415–422. doi: 10.1179/026708402225006268. - DOI
    1. Saurabh A., Meghana C.M., Singh P.K., Verma P.C. Titanium-based materials: Synthesis, properties, and applications. Mater. Today Proc. 2022;56:412–419. doi: 10.1016/j.matpr.2022.01.268. - DOI
    1. Medvedovski E., Chinski F.A., Stewart J. Innovative Processing and Manufacturing of Advanced Ceramics and Composites II: Ceramic Transactions. Volume 243. John Wiley & Sons, Inc.; Hoboken, NJ, USA: 2014. Thermal diffusion coatings for wear-resistant components for oil and gas industry; pp. 13–29. - DOI
    1. Kandeva M., Zagorski M., Nikolič R., Stojanović B., But A., Botko F., Piteľ J., Vencl A. Friction properties of the heat-treated electroless Ni coatings embedded with c-BN nanoparticles. Coatings. 2022;12:1008. doi: 10.3390/coatings12071008. - DOI

LinkOut - more resources