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. 2022 Jun 28;15(13):4535.
doi: 10.3390/ma15134535.

Investigation of MAO Coatings Characteristics on Titanium Products Obtained by EBM Method Using Additive Manufacturing

Sergey Grigoriev  1 , Nikita Peretyagin  1   2 , Andrey Apelfeld  3 , Anton Smirnov  1 , Oleg Yanushevich  2 , Natella Krikheli  2 , Olga Kramar  2 , Sergey Kramar  2 , Pavel Peretyagin  1   2
Affiliations

Investigation of MAO Coatings Characteristics on Titanium Products Obtained by EBM Method Using Additive Manufacturing

Sergey Grigoriev et al. Materials (Basel). .

Abstract

Coatings with a thickness from 27 to 62 µm on electron beam melted Ti-6Al-4V have been formed by micro-arc oxidation (MAO) in a silicate-hypophosphite electrolyte. MAO tests in the anode-cathode mode (50 Hz) with an anode-to-cathode current ratio of 1:1 and sum current densities 10 and 20 A/dm2 were carried out. The duration of the MAO treatment was 30 and 60 min. The effect of the processing parameters on the structural properties of the MAO treated coatings was studied. The current density and treatment time significantly affect the coating thickness and surface roughness. The values of these characteristics increase as the current density increases. The effect of thermal cycling tests on surface morphology, thickness and roughness, and elemental and phase composition of MAO coatings was analyzed. After 50 cycles of thermal cycling from +200 °C to -50 °C, no cracking or delamination of coatings was observed. Coatings formed in 30 min at a current density of 20 A/dm2 turned out to be the best in terms of such indicators as surface morphology, thickness, and roughness.

Keywords: MAO coating; additive manufacturing; composition; electron beam melting; heat resistance; micro-arc oxidation; roughness; structure; surface morphology; thermal cycling test; thickness; titanium alloy Ti-6Al-4V.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Substrate surface morphology (A), profile of the substrate surface (B), and elemental analysis of the surface of substrate (C).
Figure 2
Figure 2
Samples with MAO coatings Ti-MAO-10-30 (A,E), Ti-MAO-10-60 (B,F), Ti-MAO-20-30 (C,G), and Ti-MAO-20-60 (D,H), before (top row) and after (bottom row) TCT.
Figure 3
Figure 3
SEM images of surface morphology: MAO coatings Ti-MAO-10-30 (A,E), Ti-MAO-10-60 (B,F), Ti-MAO-20-30 (C,G), and Ti-MAO-20-60 (D,H), before (top row) and after (bottom row) TCT.
Figure 4
Figure 4
The cross-sectional microstructure of MAO coating (Ti-MAO-20-30_bT), and the element distribution along the marked line.
Figure 5
Figure 5
X-ray diffraction patterns of substrate (a) and samples with MAO coatings Ti-MAO-10-30 (b,f), Ti-MAO-10-60 (c,g), Ti-MAO-20-30 (d,h), and Ti-MAO-20-60 (e,i), before (b–e) and after (f–i) TCT. A—α-Ti; β—β-Ti; A—TiO2-anatase; R—TiO2-rutile.
See this image and copyright information in PMC

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