The microstructure and fatigue properties of electroless deposited NiP alloys

Yamasaki, Tohru; Izumi, Hisashi; Sunada, Hisakichi

doi:10.1016/0036-9748(81)90324-0

Cited by 20 publications

(7 citation statements)

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“…On the other hand, high phosphorus deposits seemed continuous and amorphous. Kreye et al [8] and Zhang et al [9] described electroless nickel coatings with very low phosphorus content as equiaxed and nanocrystalline, while Yamasaki et al [10], Tyagi et al [11] and Hur et al [12], concluded that low phosphorus deposits are crystalline, containing a supersaturated solid solution of phosphorus in the nickel lattice. X-ray diffraction patterns obtained from electroless nickel deposits are known to change with heat treatment as it involves change in microstructure of the nickel matrix [13].…”

Section: Introductionmentioning

confidence: 98%

Surface characterization of zincated aluminium and selected alloys at the early stage of the autocatalytic electroless nickel immersion process

Khan

Oduoza

Pearson³

2007

J Appl Electrochem

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In this work the changing structure of nickelphosphorus deposits on aluminium and its alloys at the early stage of electroless nickel phosphorus deposition using hypophosphite ion as reducing agent has been studied. Prior to electroless nickel deposition, zincating is used for pre-treatment of aluminium substrates. The surface morphology and structure of the electroless Ni-P layers were characterized by scanning electron microscopy and X-ray diffraction analysis. Results show that Ni-P deposition is closely related to the dissolution of the zincating layer, followed by progressive nickel nucleation. The nuclei serve as a catalytic surface for further Ni-P deposition which increases with deposition time. The growth and coalescence of the nuclei on the aluminium substrate results in crystalline layers of Ni-P.

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Section: Introductionmentioning

confidence: 98%

Surface characterization of zincated aluminium and selected alloys at the early stage of the autocatalytic electroless nickel immersion process

Khan

Oduoza

Pearson³

2007

J Appl Electrochem

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“…A number of workers (1,5,15,(21)(22)(23)(24)(25)(26)(27)(28) have reported that the structure of the as-plated EN is amorphous or liquid-like, whereas other investigators (29)(30)(31) concluded that the asplated structure is microcrystalline and in a supersaturated state. A number of workers (1,5,15,(21)(22)(23)(24)(25)(26)(27)(28) have reported that the structure of the as-plated EN is amorphous or liquid-like, whereas other investigators (29)(30)(31) concluded that the asplated structure is microcrystalline and in a supersaturated state.…”

Section: Resultsmentioning

confidence: 99%

Stress Corrosion Cracking of Electroless Nickel‐Plated Low‐Carbon Steel in Hot Concentrated NaOH Solutions

Lo¹,

Tsai²,

Lee³

1990

J. Electrochem. Soc.

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The stress corrosion cracking (SCC) behavior of electroless nickel (EN)-plated, low-carbon steel (LCS) in boiling concentrated sodium hydroxide solutions has been studied. The effects of NaOH concentration and heat-treatment of the EN layer on the SCC susceptibility were evaluated by constant load tests, with an initial applied stress of 120% yield strength. The results of polarization curves showed that the anodic current densities of LCS with EN coating in hot caustic solutions were almost two orders of magnitude higher than those of bare LCS. Heat-treatment at 400~ for lh or 650~ for 4h, respectively, could enhance the passive current density of EN coatings in the environments studied. The present results also showed that the as-plated EN coating improved the SCC resistance of the LCS in boiling 20 and 50 weight percent (w/o) NaOH solutions, while a detrimental effect (reducing the time to failure drastically) of the as-plated EN coating was found in boiling 40% NaOH solution by promoting intergranular SCC of the steel. Heat-treatment at 400~ for lh or 650~ for 4h could further increase the SCC susceptibility of the EN-coated LCS. Microstructural change, namely, recrystatlization and grain coarsening, could be one of the main factors affecting the corrosion and cracking behavior of the ENcoated LCS.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 147.188.128.74 Downloaded on 2015-06-01 to IP

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“…O//o P it is amorphous. Several investigations have noted that the samples with low-P are crystalline (Yamasaki et al 1981). Thus, it appears that with increase of P, the as-deposited Ni passes from crystalline to microcrystalline state continuously and then beyond a certain composition to an amorphous state.…”

Section: Discussionmentioning

confidence: 98%

“…Electroless deposition of Ni with different metalloids like P, B etc has produced both crystalline and amorphous thin films depending upon the composition of the bath (Pai and Marion !972;Gorbunova et al 1973;Hedgecock et al 1975;Yamasaki et al 1981;Cortiju and Schlesinger 1983). These metalloids have very restricted solid solubilities in Ni (Maeda 1970).…”

Section: Introductionmentioning

confidence: 99%

Electron microscopy study of chemically deposited Ni-P films

1986

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The structure ofele~troless thin films of NiP has been studied. The microstructare and the selected area diffraction pattern of the samples reveal that certain samples transform to crystalline Ni with P in solid solution by nucleation and growth, whereas others transform to crystalline state by growth alone. The former set of thin films having a P-content of 19-21 at. To is character~ed as amorphous. Films with a P-content of 13-15 at. ~o fall in the latler category and are characterized as microcrystalline. Those with a P-content of 16-18 at ~/o contain both amorphous and microcrystalline regions.

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The microstructure and fatigue properties of electroless deposited NiP alloys

Cited by 20 publications

References 4 publications

Surface characterization of zincated aluminium and selected alloys at the early stage of the autocatalytic electroless nickel immersion process

Surface characterization of zincated aluminium and selected alloys at the early stage of the autocatalytic electroless nickel immersion process

Stress Corrosion Cracking of Electroless Nickel‐Plated Low‐Carbon Steel in Hot Concentrated NaOH Solutions

Electron microscopy study of chemically deposited Ni-P films

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