Resistance of Thermal-Sprayed Duplex Coating Composed of Aluminum and 80Ni-20Cr Alloy against Aqueous Corrosion

Ishikawa, Kazuo; Suzuki, Tsuguo; Tobe, Shogo; Kitamura, Yoshiharu

doi:10.1361/105996301770349303

Cited by 11 publications

(3 citation statements)

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“…They are extensively used for corrosion protection, in automotive industry (Mo on piston rings and for "rain drop erosion" of piston heads, etc.) against aqueous corrosion [119] with Al and 80 Ni-20 Cr coatings.…”

Section: Flame Sprayingmentioning

confidence: 99%

Thermal and Cold Spray: Recent Developments

Fauchais

Montavon

2008

KEM

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Thermal spraying consists in a technology aiming at producing coatings whose thicknesses range from 10 μm to a few millimeters onto mechanical components to confer them specific and unique functional properties, such as wear and corrosion resistances, friction coefficient adaptation, thermal and electrical insulation, biocompatibility, repair, etc., among the principals. Thermal spraying consists in injecting in a viscous enthalpic jet (animated by a momentum) powder with particles which average size ranges from 0.01 to 100 μm. These particles are melted and simultaneously accelerated towards the surface of the part to be covered. They form, after impact, spreading and solidification, near-circular lamellae the stacking of which form the coating. Due to the versatility of the available processes exhibiting a wide range of enthalpic and momentum contents, virtually any kind of material exhibiting congruent melting behavior can be processed, from alloys and ceramics to polymers, ever since its melting temperature differs from its vaporization or decomposition temperature by at least 300 K and that it can be processed previously under the form of powder particles or wires. Thermal spray techniques offer the unique capability to manufacture a large variety of coatings on components of a large variety and geometry. However, thermal spraying constitutes a special process for which the coating service properties derive mostly from the structure and indirectly from the selection of the operating parameters. Very significant improvements over the past years permitted to diagnose the in-flight particle characteristics, mostly in terms of velocity and temperature. Recently, these new capabilities have made possible the development of on-line process controls. This should participate to a drastic increase in coating reliability. In convetntional thermal spraying processes, a pulverulent feedstock (i.e., powder particles) is injected within the plasma jet via a carrier gas. This approach does not permit to process small diameter particles; i.e., nano-sized particles, which could permit to form finely grained coatings. Replacing gas by liquid to carry particles offer the unique possibility to process nano-sized particles. Cold gas spraying may appear as an alternative process to reach the same goal. Indeed, thermal spray processes experienced very significant developments over the past years, opening new doors to manufacture coatings with a high reliability and superior properties. This papepr indend at presenting some of those developments.

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Section: Flame Sprayingmentioning

confidence: 99%

Thermal and Cold Spray: Recent Developments

Fauchais

Montavon

2008

KEM

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“…Thermal spray technology may meet the above requirements [1][2]. NiCr alloy coating is applied for anticorrosion at high temperature because Ni is resistant to abrasion and Cr is resistant to abrasion with good thermal resistance [3][4][5][6][7]. Al is a popular, lightweight and cheap metal, often forms hard thin oxide film on the surface and has good resistance against corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…Al is a popular, lightweight and cheap metal, often forms hard thin oxide film on the surface and has good resistance against corrosion. In previous studies, the Al coating on NiCr alloy is studied mainly focusing on mechanical properties and corrosion resistance [7][8][9][10][11]. Kazuo Ishikawa et al [7,8] studied a duplex coating composed of aluminum on uncoated 80Ni-20Cr alloy.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation-resistant NiCr/Al DUPLEX coating on CT3 STEEL SUBSTRATE

Cuong¹,

Tuấn²,

Ha³

et al. 2020

JST

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The oxidation resistance property of NiCr/Al duplex coating system has been evaluated at 800oC during retention times of 1.5; 3; 4.5 and 6 hours. After the oxidation test, SEM-EDS data indicated the diffusion of aluminum into the NiCr coating, whereas XRD patterns revealed the appearance of new phases (Al3Ni2, Al2O3). In addition, an increase in micro-hardness (up to 518 - 842 Hv) was obtained after oxidation test. These obtained findings indicated that NiCr/Al coating had higher oxidation resistance than NiCr coating.

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