On the Development and the Oxidation of Novel Ni-Cr and Ni-Al Nanocoatings by Composite Electrodeposition

Abstract

Novel Ni-based nanostructured coatings against high temperature oxidation were fabricated by composite eleoctrodeposition. The electrodeposited nanocoatings (ENCs) were prepared, separately from a nickel sulphate electrolyte bath with addition of Cr nanoparticles in an average size of 39 nm, or with Al nanoparticles in an average size of 75 nm. The Cr or Al nanoparticles were dispersed among the nanocrystalline Ni grains of ENCs. The ENC Ni-10.9Cr at 900 o C and the ENC Ni -28.0Al at 1050 o C exhibited a superior oxidation resistance as a result of the formation of continuous chromia or alumiuna scale, respectively. It is proposed that the dispersion of the Cr or Al nanoparticles among the nanocrystalline Ni grains greatly increased the surface density of the nucleation sites for Cr 2 O 3 or Al 2 O 3 ; simultaneously, the nanostructured coatings favored rapid healing of the narrowed Cr 2 O 3 or Al 2 O 3 nuclei during a very short transient period, which consequently led to the suppression of NiO growth.

Optimization of Ni-Cr Alloy Coatings Produced Using the Electrodeposition Method

“…Researchers working on Ni-Cr alloy coating generally did not need stirring (Adelkhani & Arshadi, 2009;Kunyarong & Fakpan, 2018;X. U. Li-jian, Zhu-qing, & Jian-xin, 2007;Peng et al, 2004;Razaghi et al, 2020;Saravanan & Mohan, 2011;Sheibani Aghdam et al, 2015;Surviliene, Češuniene, et al, 2013;Zhang et al, 2015). This study supports the result that no stirring gives the best corrosion resistance.…”

“…) (He et al, 2013;Sheibani Aghdam, Allahkaram, & Mahdavi, 2015). Chromium with nickel; They are preferred for their good corrosion and high oxidation resistance and high temperature resistance (Demir, 2021;Etminanfar & Heydarzadeh Sohi, 2012;Peng, Zhou, Wang, & Zhang, 2004;Sheibani Aghdam et al, 2015;Zhang, Liu, Bai, & Liu, 2015).…”

A Novel Electrodeposited Ni-Cr-Al Nanocomposite with Improved Oxidation Resistance

“…To ensure the suspension of the nanoparticles in the bath, a reciprocating perforated plate was used, as described in our previous papers [12][13][14][15]. The average composition of the deposit analyzed by EDAX (using weight percentages) was 3.2 wt.…”

“…Recently, Peng et al [12][13][14][15][16][17] developed novel Ni-Cr and Ni-Al nanocomposites by composite electrodeposition of Ni with Cr or Al nanoparticles. These as-deposited nanocomposites exhibited excellent resistance to high temperature oxidation [12][13][14][15]and hot corrosion [16][17].…”

Preparation and Oxidation of Novel Electrodeposited Cu–Ni–Cr Nanocomposites

“…[14][15][16][17][18] These nanocomposites consisted of a nanocrystalline Ni matrix with dispersed second-phase of nanoparticles. The unique microstructure favored the rapid formation of protective chromia or alumina scales.…”