Corrosion behaviour of thermal sprayed nitinol coatings

Guilemany, J.M.; Cinca, N.; Dosta, S.; Benedetti, Assis Vicente

doi:10.1016/j.corsci.2008.10.022

Cited by 60 publications

(57 citation statements)

References 31 publications

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“…Hereon, HVOF process can be used as a technological alternative to the more expensive technologies. Guilemany et al have developed HVOF NiTi coatings [11] who investigated the corrosion performance of thermally sprayed NiTi coatings on a carbon steel substrate. According to Tafel polarization tests, they concluded that HVOF NiTi coatings prepared from atomized powders showed fairly good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical impedance spectroscopy of HVOF-sprayed NiTi intermetallic coatings deposited on AISI 1045 steel

Verdian¹,

Raeissi²,

Salehi³

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Electrochemical impedance spectroscopy of HVOF-sprayed NiTi intermetallic coatings deposited on AISI 1045 steel

Verdian¹,

Raeissi²,

Salehi³

2010

Journal of Alloys and Compounds

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“…Neither porosity nor oxidation can be observed in the VPS coating and the splat morphology is only revealed by etching, leading to two distinct kind of areas (fig. 4a); it is not actually clear why ones have been preferentially etched than the others but it seems that the rougher ones are slightly Ti-richer [22]. The X-ray pattern shows the presence of a background typical of amorphization zones; such reasoning was also illustrated in TEM studies.…”

Section: Vps Aps and Hvof Coatingsmentioning

confidence: 84%

NiTi thermal sprayed coatings characterization

Cinca

Isalgué²,

Fernández

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. NiTi alloy has been particularly studied over many years for its shape memory properties and excellent corrosion resistance and biocompatibility, thus making it suitable for many biomedical applications. Then, bulk material properties have been well characterized depending on the nominal composition, manufacturing method and thermal treatments. It has been, however, less studied the use of such alloy in its overlay form, many times just employing Vacuum Spraying (VPS) for thick coatings in order to avoid Ti oxidation. The present study explores and compares the spraying of atomized NiTi powders by VPS as well as by Atmospheric Plasma Spraying (APS) and High Velocity Oxygen Fuel (HVOF). X-ray diffraction studies conducted at metastable rhombohedral NiTi phase at low temperatures and at room temperatures and higher the result was beta phase. DSC experiments also supported the previous phase transformations. After spraying, according to the thermal history of the particles in each spraying technology, it is observed the retention of the -NiTi feedstock phase as well as the appearance of metastable phases, amorphization and nanocrystalline areas. Also with XRD at different temperatures and, especially in the case of the HVOF coating, due to the moderate heat input of the process, the final results fairly agreed with those of the original powder.

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“…It was also reported that Cr and Al could form a thin passive layer to control the corrosion [44]. A less-porous coating, as obtained in this study using the HVAF process, allows Cr and Al to easily diffuse further to the corrosion front where the passive film is supposed to form.…”

Section: Single-layer and Bilayer Coatingsmentioning

confidence: 88%

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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Corrosion behaviour of thermal sprayed nitinol coatings

Cited by 60 publications

References 31 publications

Electrochemical impedance spectroscopy of HVOF-sprayed NiTi intermetallic coatings deposited on AISI 1045 steel

Electrochemical impedance spectroscopy of HVOF-sprayed NiTi intermetallic coatings deposited on AISI 1045 steel

NiTi thermal sprayed coatings characterization

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

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