Effect of MAO coatings on cavitation erosion and tribological properties of 5056 and 7075 aluminum alloys

Effect of MAO coatings on cavitation erosion and tribological properties of 5056 and 7075 aluminum alloys

Two ceramic coatings have been applied on 5056 and 7075 aluminum alloy by microarc oxidation (MAO) technology. The mass losses, surface morphologies and the phase constituents of the MAO coatings before and after cavitation tests were examined by means of digital scales, scanning electron microscopy...

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Bibliographic Details
Published in:Wear Vol. 474-475; p. 203709
Main Authors: Szkodo, Marek, Stanisławska, Alicja, Komarov, Aleksandr, Bolewski, Łukasz
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-06-2021
Elsevier Science Ltd
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Cavitation
Cavitation erosion
Cavitation resistance
Ceramic coatings
Coating effects
Elastic properties
Erosion resistance
Hardness
Mechanical properties
Micro-arc oxidation
Modulus of elasticity
Morphology
Nanoindentation
Oxidation
Scratch tests
Surface layers
Tribology
Mechanical properties
Aluminum alloys
Cavitation erosion
Micro-arc oxidation
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Summary:Two ceramic coatings have been applied on 5056 and 7075 aluminum alloy by microarc oxidation (MAO) technology. The mass losses, surface morphologies and the phase constituents of the MAO coatings before and after cavitation tests were examined by means of digital scales, scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. In order to assess the impact of the mechanical properties of the surface layer on cavitation erosion resistance, hardness (H), reduced Young's modulus (E), surface elastic properties (Wel), surface toughness (KIC), structure continuity and resistance to delamination and cohesion forces were determined using nanoindentation and scratch tests. The results indicate that there is a correlation between cavitation erosion resistance and hardness, H/E ratio and surface elasticity. •Two MAO coatings were made on 7075 and 5056 aluminum alloys.•The MAO coating on 5056AA had a single phase γ-Al2O3 structure.•The MAO coating on 7075AA had a biphasic α-Al2O3 + γ-Al2O3 structure.•Cavitation tests were performed by using a ultrasonic cavitation test rig.•Higher surface hardness and elasticity increase cavitation erosion resistance.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2021.203709