Improved microhardness and wear resistance of the as-deposited electroless Ni–P coating

Yan, Mi; Hua, Ying; Ma, Tianyu

doi:10.1016/j.surfcoat.2008.06.180

Cited by 115 publications

(61 citation statements)

References 20 publications

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“…Hou et al [7] suggested that the wear resistance of 400°C heat-treated coating could be increased up to being about 2.5 times as large as that of as-plated coatings. Yan et al [12] reported that, with the phosphorus content increasing, the electroless Ni-P coating structure transformed from crystalline to a mixture of nanocrystalline and amorphous phases and finally to full amorphous phase; then, the wear resistance of electroless Ni-P coating was greatly improved. Sahoo [13] found that annealing temperature and bath temperature had the most significant influence on controlling wear properties of electroless Ni-P coatings.…”

Section: Introductionmentioning

confidence: 99%

High-temperature tribological properties of Ni-P alloy coatings deposited by electro-brush plating

Qian

Wang

et al. 2011

Rare Metals

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High-temperature tribological properties of Ni-P alloy coatings processed by electro-brush plating on 20CrMo steel have been investigated. A ball-on-disc configuration was employed and 4 mm diameter Si 3 N 4 balls were used as static counterpart. All the wear tests were carried out at 450°C for 180 min without lubricants. The electro-brush plating Ni-P coating is amorphous in as-deposited condition, and it becomes polycrystalline with the formation of Ni and Ni 3 P after heat treatment at 450°C for 1 h. The friction coefficient of the Ni-P coating is just 50% of that of the 20CrMo steel at the friction temperature of 450°C. A mild adhesive wear mechanism was found for the electro-brush plating Ni-P coating tested at 450°C, whereas for the 20CrMo steel at the same temperature a mixed adhesive and abrasive wear mechanism was observed.

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Section: Introductionmentioning

confidence: 99%

High-temperature tribological properties of Ni-P alloy coatings deposited by electro-brush plating

Qian

Wang

et al. 2011

Rare Metals

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“…This trend was already expected for Ni-P and hard chromium coatings and it is useful to evaluate their wear behaviour. Several authors have already noticed better wear performance in Ni-P samples after heat treatment 8,18,24 , but these results when compared to hard chromium were unexpected due to well-known high hardness. Hence, not taking into account the lowest values of surface roughness for Ni-P coatings, it can be assumed that heat treated Ni-P deposits have equal or even higher mechanical properties than hard chromium.…”

mentioning

confidence: 97%

“…The microstructure of the Ni-P deposit is quite dependent of the phosphorus content and their properties change drastically as well. Several studies have reported that increasing the phosphorus amount above values of 9%P wt., the tendency of an amorphous structure formation is increased, leading to a higher corrosion resistance [7][8][9][10][11][12] . Studies have observed that with appropriate heat treatment (transformation occurred around 340ºC) the metastable amorphous structure could be transformed into an equilibrium fully crystalline structure [13][14][15][16][17][18][19][20][21] .…”

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confidence: 99%

Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Goettems

Ferreira

2017

Mat. Res.

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In this present study was evaluated the influence of heat treatment on the wear resistance of electroless high phosphorus nickel coating (9-10% P wt.). In addition, both untreated and treated Ni-P deposits were then compared to electroplated hard chromium coatings in terms of wear behaviour. Three different heat treatment conditions were performed at temperatures of 320ºC, 400ºC and 500ºC under different holding times. The selection of the heat treatment conditions was chosen considering the results obtained by a differential scanning calorimetry (DSC) analysis. The wear behaviour of the Ni-P samples was investigated through a non-lubricated "ball on plate" test carried out against an Al 2 O 3 counter-face. After an analysis of the friction coefficient, microstructure of the worn surface, width and chemical composition of the wear track, was possible to conclude that the heat treatment affect positively the wear resistance of Ni-P coatings. Treatment conditions of 320ºC with 9 hours holding time and 400ºC with 1 hour holding time showed the best results due to a structural change from amorphous supersatured solid solution of phosphorus in nickel to a crystalline structure of nickel crystallites and nickel phosphides (Ni 3 P) occurred between 320ºC and 360ºC that was verified after x-ray diffraction analysis. Moreover, Ni-P heat treated coatings showed better results when compared to electroplated hard chromium deposits, hence acting as a natural alternative for chromed coatings.

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“…When an ENP is composed of 10.8% P and has a microcrystalline structure as a major constituent, it is annealed at a temperature of 200 to 300°C for 4 h. This results in the formation of Ni 12 P 5 microcrystalline nickel and in Ni 3 P phases at all temperatures. Crystalline nickel and Ni 3 P phases are observed under annealing at higher temperatures (400-600°C) [23].…”

Section: Heat Treatment Effectsmentioning

confidence: 99%

Recent advances in electroless-plated Ni-P and its composites for erosion and corrosion applications: a review

et al. 2018

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The metallic coating of surfaces plays a vital role in the protection of most industrial applications. Coatings can be carried through various routes (e.g., mechanical and electrochemical plating techniques). Electroless nickel coatings present unparalleled properties and a unique combination of corrosion and wear resistance features. Recently, the use and development of electroless nickel-phosphorus (ENP) coatings has attracted broad attention from many industries (e.g., oil and gas) due to their superior corrosion and wear resistance properties. In the present review article, mechanisms of ENP and preparation methods are briefly outlined. The review sheds light on properties of electroless Ni-P coatings and of their nanocomposites with an emphasis on new products and on their future development.

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Improved microhardness and wear resistance of the as-deposited electroless Ni–P coating

Cited by 115 publications

References 20 publications

High-temperature tribological properties of Ni-P alloy coatings deposited by electro-brush plating

High-temperature tribological properties of Ni-P alloy coatings deposited by electro-brush plating

Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Recent advances in electroless-plated Ni-P and its composites for erosion and corrosion applications: a review

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