Abstract
Nanostructured anodic oxide layers on an FeAl3 intermetallic alloy was prepared by two-step anodization in 20 wt.% H2SO4 at 0 °C. The obtained anodic oxide coating was subjected to phase and chemical composition analysis using XPS and XRD techniques. An analysis of the band gap of individual coatings was also performed. The applied parameters of the anodization process were determined, enabling the formation of a nanostructured coating on the FeAl3 intermetallic alloy. Tests were carried out on samples produced at a voltage between 10 V and 22.5 V in 2.5 V steps. The produced coatings were subjected to an annealing process at 900 °C for 2 h in an argon protective atmosphere. Moreover, the influence of the substrate chemical composition on the chemical and phase composition of the anodic oxide are discussed. Band gaps of 2.37 eV at 22.5 V and 2.64 eV at 10 V were obtained directly after the anodizing process. After applying the heat treatment, band gap values of 2.10 eV at 22.5 Vand 2.48 eV for the coating produced at 10 V were obtained.
Highlights
The electrochemical anodization process is one of several processes that produces nanometric coatings of metal oxides on the surface of various types of materials.The process of electrochemical anodization is commonly understood to be a process that uses electrochemical phenomena that involve producing an oxide nanolayer under the influence of an electric field on the surface of the metal placed in the electrolyte
We present and discuss the influence of applied process parameters as well as substrate chemical composition on the phase and chemical composition of the coatings directly after anodization and heat treatment
The research led to the effective production of a nanoporous coating using the anodization process for the first time on a construction material, which is the FeAl3 intermetallic alloy
Summary
The electrochemical anodization process is one of several processes that produces nanometric coatings of metal oxides on the surface of various types of materials.The process of electrochemical anodization is commonly understood to be a process that uses electrochemical phenomena that involve producing an oxide nanolayer under the influence of an electric field on the surface of the metal placed in the electrolyte This process is carried out in simple two-electrode systems, where the anode is the base material for the growth of the nanometric anodized layer.This process can be carried out both on pure metals and their alloys, and is of particular relevance for construction materials, for example metals such as CuAl [1], V [2], and intermetallic-based alloys, such as Ni3 Al [3,4], TiAl [5,6,7]. On the other hand, when anodic oxides are prepared on various types of machine components, they prevent premature wear and destruction [8,9,10,11,12] This method allows designing a variety of nanostructured materials with different oxide morphologies by selecting the appropriate process parameters. It should be Materials 2020, 13, 3471; doi:10.3390/ma13163471 www.mdpi.com/journal/materials
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