Plasma Electrolytic Oxidation of Al-Zn-Mg-Ni-Fe “Nikalin” Alloys-Reference-Cited by-同舟云学术

Plasma Electrolytic Oxidation of Al-Zn-Mg-Ni-Fe “Nikalin” Alloys

Published:2024-06-07 Issue:6 Volume:14 Page:680
ISSN:2075-4701
Container-title:Metals
language:en
Short-container-title:Metals

Author:

Letyagin Nikolay V.¹²^ORCID,Akopyan Torgom K.¹²^ORCID,Sokorev Alexander A.³,Shkaley Ivan V.⁴^ORCID,Cherkasov Stanislav O.²,Doroshenko Vitali V.¹,Sviridova Tatiana A.⁵,Churyumov Alexander Yu.⁶^ORCID

Affiliation:

1. Sector of Scientific Activity, Moscow Polytechnic University, 38, Bolshaya Semyonovskaya str., Moscow 107023, Russia

2. Department of Metal Forming, National University of Science and Technology MISIS, Leninsky Pr. 4, Mocow 119049, Russia

3. Casting Department, National University of Science and Technology MISIS, Leninsky Pr. 4, Moscow 119049, Russia

4. Ishlinsky Institute for Problems in Mechanics RAS, Moscow 119526, Russia

5. Institute of New Materials and Nanotechnology, National University of Science and Technology MISIS, Leninsky Prospekt 4, Moscow 119049, Russia

6. Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology MISIS, Leninsky Prospekt 4, 119049 Moscow, Russia

Abstract

Ceramic coatings were formed on the surface of as-cast Al5.2Zn1.7Mg0.4Ni0.3Fe and heat-treated Al7.0Zn2.7Mg0.5Ni0.4Fe “nikalin” aluminum alloys by using the plasma electrolytic oxidation (PEO) technique in a silicate–alkaline electrolyte. Uniform coatings containing a minimum number of defects and consisting predominantly of a γ-Al2O3 phase were synthesized on the surface of both Al-Zn-Mg-Ni-Fe alloys. The coatings had a microhardness of 660–1200 HV, which is 3.5–11 times higher than that of the “bare” as-cast and heat-treated alloy. The coating on the Al5.2Zn1.65Mg0.4Ni0.3Fe alloy had the highest peak hardness, which is probably caused by the lower residual alloying elements Zn and Mg in the coating bulk. As a consequence, the PEO coating with the highest hardness synthesized on the as-cast alloy exhibited a lower wear rate as compared to the heat-treated alloy. The polarization curves in 3.5% NaCl show that the PEO coatings in all cases reduced the corrosion current density and shifted the corrosion potential toward positive values, thus indicating protective properties of the coatings. The corrosion rate of the as-cast and heat-treated Al-Zn-Mg-Ni-Fe alloys increased noticeably by about 3.7–5.7 times after PEO treatment. A relationship between the residual alloying elements Zn and Mg in the bulk of the PEO coatings and corrosion resistance was established.

Funder

Moscow Polytechnic University

Russian Science Foundation

Publisher

MDPI AG

Link

https://www.mdpi.com/2075-4701/14/6/680/pdf

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