Improving corrosion properties of high-velocity oxy-fuel sprayed inconel 625 by using a high-power continuous wave neodymium-doped yttrium aluminum garnet laser

Tuominen, Jari; Vuoristo, Petri; Mäntylä, T.; Kylmälahti, Mikko; Vihinen, Jorma; Andersson, Peter

doi:10.1007/bf02608555

Cited by 35 publications

(12 citation statements)

References 10 publications

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“…They indicated that the coating with 58% W provided wear resistance five times more than that of the untreated specimens. Laser treatment of HVOF coating and effects of treatment on the corrosion properties of the coating was examined by Tuomine et al [9]. They showed that laser re-melting of coating improved the adhesion and homogeneity of the coating.…”

Section: Mathematical Modeling Of Liquid Layer Formationmentioning

confidence: 99%

Laser treatment of HVOF coating: model study and characterization

2007

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HVOF coating is widely used in industry for protective coating of the metallic surfaces. The coating is based on the mechanical anchoring of the splats onto the substrate surface and thermal integration among the splats in the coating is not possible during the spraying process due to the operation temperature, which is lower than the melting temperature of the coating material. This, in turn, results in the formation of non-homogeneous structures and voids in the coating. One of the techniques to avoid such situations is to integrate the spats through the controlled melting. This can be achieved through the laser melting process. In the present study, laser melting of HVOF coating is modeled to determine the melt layer thickness. A lump parameter analysis is introduced in the model study and simulations are carried out in relation to the actual laser melting conditions. The melt layer predicted is compared with the experimental measurements. The microstructural analyses prior and post laser melting process are carried out using SEM and EDS. It is found that the predictions ofthe melt layer are in good agreement with experimental results.

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Section: Mathematical Modeling Of Liquid Layer Formationmentioning

confidence: 99%

Laser treatment of HVOF coating: model study and characterization

2007

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“…They showed that the interconnected porosity was completely eliminated, except few shallow cracks were observed. Tuominen et al investigated the corrosion resistance of HVOF coatings posttreated by laser heating process [10]. They found that excellent corrosion resistance coatings could be obtained after a proper selection of laser processing parameters.…”

Section: Introductionmentioning

confidence: 99%

Investigation on microstructure, surface properties and anti-wear performance of HVOF sprayed WC–CrC–Ni coatings modified by laser heat treatment

Zhang

Cho

Yoon

et al. 2009

Materials Science and Engineering: B

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“…In an effort to further improve the corrosion behaviour of coatings, a number of researchers have investigated the use of laser surface melting (LSM) [8][9][10][11]. LSM of thermally sprayed coatings has been shown to be able to significantly improve corrosion performance.…”

Section: Introductionmentioning

confidence: 99%

“…LSM of thermally sprayed coatings has been shown to be able to significantly improve corrosion performance. This improvement is attributed to elimination of interconnected porosity as well as a general homogenisation of the structure [8,9]. However, some LSM treatments produce no significant effects on corrosion performance [10] and in other cases LSM effects, such as the inhomogeneities produced by overlapping tracks, can degrade corrosion resistance [11].…”

Section: Introductionmentioning

confidence: 99%

The effects of microstructural features on the performance gap in corrosion resistance between bulk and HVOF sprayed Inconel 625

Ahmed¹,

Bakare²,

McCartney³

et al. 2010

Surface and Coatings Technology

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractIt is commonly observed that there is a performance gap between the corrosion resistance of thermally sprayed coatings and the equivalent bulk material. This is attributed to the significantly modified microstructure of the sprayed coatings. However, currently there is no detailed understanding of which aspects of microstructural modification are primarily responsible for this performance gap. In this work several deliberately microstructurally modified versions of the Ni-based superalloy Inconel 625 were produced. These were subjected to potentiodynamic electrochemical testing in 0.5M H 2 SO 4 to investigate the links between specific microstructural features and electrochemical behaviour. Samples were prepared by high velocity oxy-fuel (HVOF) thermal spraying, laser surface remelting using a high power diode laser and conventional powder sintering. Microstructural features were examined by optical and scanning electron microscopy and X-ray diffraction.Potentiodynamic testing was carried out on the following forms of Inconel 625: wrought sheet; HVOF sprayed coatings; sintered powder compacts; laser melted wrought sheet and HVOF sprayed coatings. Using the corrosion behaviour, i.e. passive current density, of the wrought sheet as a baseline, the performance of different forms of Inconel 625 were compared. It is found that a fine dendritic structure (with associated microsegregation) produced by laser remelting wrought sheet has no significant effect on corrosion performance.Up to 12% porosity in sintered powder samples increases the passive current density by a factor of only around 2. As observed previously, the passive current density of HVOF sprayed coatings is 20 -40 times greater. However, HVOF coatings subjected to laser surface remelting are found to have a passive current density close to that of wrought material. It is concluded that, whilst porosity in coatings produces some decrease in corrosion resistance, the main contributing factor is the galvanic corrosion of localised Cr-depleted regions which are associated with oxide inclusions within HVOF sprayed samples.

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Improving corrosion properties of high-velocity oxy-fuel sprayed inconel 625 by using a high-power continuous wave neodymium-doped yttrium aluminum garnet laser

Cited by 35 publications

References 10 publications

Laser treatment of HVOF coating: model study and characterization

Laser treatment of HVOF coating: model study and characterization

Investigation on microstructure, surface properties and anti-wear performance of HVOF sprayed WC–CrC–Ni coatings modified by laser heat treatment

The effects of microstructural features on the performance gap in corrosion resistance between bulk and HVOF sprayed Inconel 625

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