Investigation of the bond coats for thermal barrier coatings on Mg alloy

Fan, Xizhi; Zou, Binglin; Gu, Lixu; Wang, Chunjie; Wang, Ying; Huang, Wenzhi; Zhu, Ling; Cao, Xia

doi:10.1016/j.apsusc.2012.10.192

Cited by 33 publications

(26 citation statements)

References 22 publications

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“…A wide range of techniques, such as chemical conversion coating , physical vapor deposition (Ref 9, 10), spraying (Ref [11][12][13], plating (Ref [14][15][16], and laser surface modification ( Ref 17,18), have been employed to improve the corrosion resistance of Mg and its alloys. But recent studies have focused on the MAO process (Ref .…”

Section: Introductionmentioning

confidence: 99%

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Fattah‐alhosseini

Joni

2015

J. of Materi Eng and Perform

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In this study, the effect of KOH concentration on the electrochemical properties of micro-arc oxidation (MAO) coated Mg alloy AZ31B has been investigated. Also, the surface morphology and chemical composition of the MAO coatings have been characterized by scanning electron microscopy and x-ray diffraction. In MAO process, an increase in the concentration of KOH as a result of increase in the electrolyte electrical conductivity leads to a reduction in sparking which in turn improves the quality and the behavior of anodic coatings in the concentration of 2.5 M. Moreover, it can be concluded that the MAO coating shows its best protective behavior when KOH concentration is equal 2.5 M, and if the concentration is higher or lower than this value, the protective properties of MAO coating will decrease.

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Section: Introductionmentioning

confidence: 99%

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Fattah‐alhosseini

Joni

2015

J. of Materi Eng and Perform

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“…A commercial NiCoCrAlYTa (Ni 20 Co 18 -Cr 6 Al 0.3 Y2%Ta-AMDRY 997) powder (with size in the range of 10-40 mm) was used as a bond coat (see Fig. 1), as reported in previous investigations [25,26].…”

Section: Methodsmentioning

confidence: 99%

“…These materials are able to provide excellent corrosion resistance for metallic substrates such as stainless steel, cobalt-chromium alloys and mild steel [22][23][24][25][26][27][28][29]. In particular, plasma sprayed nanostructure ceramic coatings derived from agglomerated feed stocks had much higher abrasive wear, thermal shock and corrosion resistance than the corresponding conventional coatings.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, the use of a metallic bond coat along with a reduction of the Mg alloy surface temperature has been suggested for this type of material during plasma spraying (especially when spraying ceramic materials on a Mg surface). A metallic bond coat such as MCrAlY can reduce the thermal expansion coefficient mismatch between the ceramic top coat and the Mg alloy substrate [25,26]. This can prevent spallation of the sprayed ceramic coating from the Mg substrate during spraying and cooling to room temperature.…”

Section: Introductionmentioning

confidence: 98%

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Microstructural characterisation of air plasma sprayed nanostructure ceramic coatings on Mg–1%Ca alloys (bonded by NiCoCrAlYTa alloy)

Daroonparvar

Yajid

Yusof

et al. 2016

Ceramics International

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“…In the NiCoCrAlY coating, the presence of two phases (γ-NiCoCr and β-NiAl), which most probably had E corr (or OCP) close to each other, resulted in corrosion propagation through the splat boundaries around a single NiCoCrAlY particle. Therefore, the high corrosion protection by the NiCoCrAlY coating could be due to the homogeneous alloy composition, without formation of macrogalvanic cells [43].…”

Section: Single-layer and Bilayer Coatingsmentioning

confidence: 99%

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

Sadeghimeresht

Markocsan

2017

Coatings

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Cr 3 C 2 -NiCr coatings are greatly used to protect critical components in corrosive environments and to extend their lifetime and/or improve functional performance. However, the pores formed during spraying restrict the coating's applicability area for many corrosion protection applications. To overcome this technical challenge, bilayer coatings have been developed, in which an additional layer (the so-called "intermediate layer") is deposited on the substrate before spraying the Cr 3 C 2 -NiCr coating (the so-called "top layer"). The corrosion behavior of the bilayer coating depends on the composition and microstructure of each layer. In the present work, different single-layer coatings (i.e., Cr 3 C 2 -NiCr, Fe-and Ni-based coatings) were initially sprayed by a high-velocity air fuel (HVAF) process. Microstructure analysis, as well as electrochemical tests, for example, open-circuit potential (OCP) and polarization tests, were performed. The potential difference (∆E) had a great influence on galvanic corrosion between the top and intermediate layers, and thus, the coatings were ranked based on the OCP values (from high to low) as follows: NiCoCrAlY > NiCr > Cr 3 C 2 -NiCr > NiAl > Fe-based coatings (alloyed with Cr) > pure Ni. The Ni-based coatings were chosen to be further used as intermediate layers with the Cr 3 C 2 -NiCr top layer due to their capabilities to show high OCP. The corrosion resistance (R p ) of the bilayer coatings was ranked (from high to low) as follows: NiCoCrAlY/Cr 3 C 2 -NiCr > NiCr/Cr 3 C 2 -NiCr > NiAl/Cr 3 C 2 -NiCr > Ni/Cr 3 C 2 -NiCr. It was shown that splat boundaries and interconnected pores are detrimental for corrosion resistance, however, a sufficient reservoir of protective scale-forming elements (such as Cr or/and Al) in the intermediate layer can significantly improve the corrosion resistance.

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Investigation of the bond coats for thermal barrier coatings on Mg alloy

Cited by 33 publications

References 22 publications

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Microstructural characterisation of air plasma sprayed nanostructure ceramic coatings on Mg–1%Ca alloys (bonded by NiCoCrAlYTa alloy)

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

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