The oxidation of electroless Ni-B and Ni-P coatings in air at 800 to 1000�C

Tomlinson, W. J.; Wilson, G. R.

doi:10.1007/bf01144705

Cited by 22 publications

(10 citation statements)

References 15 publications

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“…In Ni-P coating, EDS linear profile analysis (Figure 7 Tomlinson and Wilson [11] found that oxidation of Ni-P coatings starts above 400°C. They observed a thin film of NiO at 600°C after 7.3 h. NiO is the first corrosion product formed on electroless Ni coatings at high temperatures [15,19].…”

Section: Characterisation After Oxidation Testsmentioning

confidence: 99%

High-temperature oxidation resistance of Ni–P and Ni–B electroless coatings on mild steel after long-term tests

Castaño¹,

Arias²,

Galvis³

2019

Corrosion Engineering, Science and Technology

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The oxidation resistance of Ni-P and Ni-B electroless coatings applied on mild steel has been determined by means of isothermal oxidation tests at 600°C for up to 400 h for uncoated and coated samples. The oxidation rate is evaluated by means of gravimetric analysis. SEM, EDS, XRD and Raman Spectroscopy characterisation allows establishing the morphological and chemical features of the coatings and the oxidation products, as well as their relationship with the oxidation resistance at high temperature. Coated samples show higher oxidation resistance than un-coated samples, being better the behavior of Ni-P coatings. The protective behaviour of electroless coatings is associated with factors such as the formation of a Ni-Fe interdiffusion layer, the incorporation of NiO into the oxide layer and the formation of crystalline phases of Ni 3 P.

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Section: Characterisation After Oxidation Testsmentioning

confidence: 99%

High-temperature oxidation resistance of Ni–P and Ni–B electroless coatings on mild steel after long-term tests

Castaño¹,

Arias²,

Galvis³

2019

Corrosion Engineering, Science and Technology

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“…The results reported in [38,39,40] clearly indicate that there are different oxidation mechanisms for different temperature ranges. In each temperature range, the activation energy is different, because E a increases with temperature.…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

“…Our observations indicate that copper used for fiber coating is not chemically pure, as it gets covered with a dark layer after immersion in 5% NaOH solution for a few minutes, which does not occur with pure Cu. Furthermore, metal-coated fiber samples were repeatedly stretched during our experiment, which does not correspond to the methodology reported for weight gain measurements, where no strain is applied [38,39,40]. This factor in an evident way influences the results, since the oxide layer residing on the top of the metal coating is brittle and prone to breakage during stretching.…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

“…In the first case, the discrepancy caused by omitting the diffusion is relatively small, due to the small values of interdiffusion coefficients, thanks to which nickel can be used as a barrier coating for Cu, even at high temperatures [ 27 ]. The screening effect is also insignificant due to the high porosity of the oxidized nickel layer and the relatively high rate of NiP alloy oxidation [ 38 ].…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

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New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

Wysokiński¹,

Stańczyk²,

Gibala³

et al. 2014

Materials

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Microstructured optical fibers can be precisely tailored for many different applications, out of which sensing has been found to be particularly interesting. However, placing silica optical fiber sensors in harsh environments results in their quick destruction as a result of the hydrolysis process. In this paper, the degradation mechanism of bare and metal-coated optical fibers at high temperatures under longitudinal strain has been determined by detailed analysis of the thermal behavior of silica and metals, like copper and nickel. We furthermore propose a novel method of enhancing the lifetime of optical fibers by the deposition of electroless nickel-phosphorous alloy in a low-temperature chemical process. The best results were obtained for a coating comprising an inner layer of copper and outer layer of low phosphorous nickel. Lifetime values obtained during the annealing experiments were extrapolated to other temperatures by a dedicated model elaborated by the authors. The estimated copper-coated optical fiber lifetime under cycled longitudinal strain reached 31 h at 450 °C.

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“…5,6 Although heat treatment is vital for improving the strength of most of the EN coatings, few studies actually deal with the issues with heat treatment and their impact on the performance of the coatings. Tomlinson and Wilson 7 have studied the oxidation behavior of Ni–P and Ni–B coatings heat treated at higher temperature (i.e., 800°C and 1000°C for 440 min). The outcome demonstrated that the two coatings had adhered to the parabolic oxidation law, and the Ni–P coating had the least oxidation resistance in contrast to Ni–B coating.…”

Section: Introductionmentioning

confidence: 99%

Oxidation issues during heat treatment and effect on the tribo-mechanical performance of electroless Ni-P–Cu deposits

Biswas

Das

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present work attempts to study the issues associated with heat treatment of electroless Ni–P–Cu coatings particularly with respect to oxidation and observe their impact on the hardness (micro- and nano-indentation), friction, and wear behavior of the coatings. Electroless Ni–P–Cu coating is deposited on low carbon steel substrates and subjected to heat treatment at temperatures ranging between 400°C and 800°C and for durations of 1 h and 4 h. Additionally, scratch tests are conducted on the coatings to evaluate their abrasion resistance as well as observe the influence of heat treatment conditions on the adhesion of the coatings. The changes in the microstructure of the coatings are suitably captured with various characterization tools, namely, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. It is seen that above a heat treatment temperature of 450°C, oxidation of the coating is prominent. Moreover, diffusion of iron from the substrate leads to the formation of intermetallic compounds. The coating performs well when heat-treated around 400°C–450°C. Above 600°C, the performance of the coating degrades with unnecessary oxide formation and other associated phenomena, namely, grain coarsening, flaking, and so on.

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The oxidation of electroless Ni-B and Ni-P coatings in air at 800 to 1000�C

Cited by 22 publications

References 15 publications

High-temperature oxidation resistance of Ni–P and Ni–B electroless coatings on mild steel after long-term tests

High-temperature oxidation resistance of Ni–P and Ni–B electroless coatings on mild steel after long-term tests

New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

Oxidation issues during heat treatment and effect on the tribo-mechanical performance of electroless Ni-P–Cu deposits

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