The process of formation of amorphous Ni-P layers made by electroless deposition

Szász, András; Kojnok, J.; Kertész, L.; Paál, Z.; Hegedűs, Zoltán

doi:10.1016/0040-6090(84)90448-6

Cited by 19 publications

(3 citation statements)

References 3 publications

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“…There is a possibility that other reflections were present in minor proportions that were not detected because the deposits were too thin. It has been widely observed that fresh bath deposits have either microcrystalline or fine crystalline structures but deviation from crystallinity increase with increase in time and thickness [32]. The sharp diffraction peaks correspond to deposits of crystalline nature while diffuse diffraction peaks reflect amorphous structure.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

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: X-ray Diffraction Analysismentioning

confidence: 99%

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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“…크롬도금은 외관이 보기 좋고 대기 중에서 변색 이 없으며, 또한 염산 이외의 산에 대해서 부식되 지 않은 성질을 갖고 있으나 전착에 의한 크롬도금 층은 핀홀이나 균열이 생기기 쉽고 소지를 완전히 피복하기가 어려운 것으로 보고되고 있다. 따라서 구리, 니켈 등의 핀홀이 없는 다른 금속을 사용하 고, 그 위에 극히 엷게 전착시키는 것이 일반적인 것으로 알려져 있다 [1][2][3][4][5] . 현재 사용되는 도금액을 표 1에 나타내었는데, 크 롬산 100 g/l의 저농도에서부터 500 g/l의 고농도까 지 사용되고 있다.…”

Section: 서 론unclassified

Study on Improvement of Mechanical Properties after Heat Treatment of Hard Chromium Electrodeposits with Additives

Kang¹,

Lee²

2014

Journal of the Korean institute of surface engineering

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The addition of cyclo propane carbonyl (cpc) to chromium electroplating bath resulted in a chromium deposit which had greatly improved mechanical properties compared to conventional chromium deposits in condition of heat treatment at high temperature. The as?deposited layers had a Vicker's hardness of about 1170, which is comparable to that of conventional chromium plating deposits. With annealing, the hardness goes through a maximum of 1650 at 600°C. Generally speaking, the hardness of conventional plating decreases monotonically with heat treatment. X?ray diffraction show that annealing up to above 400°C causes formation and growth of chromium crystallites and that chromium carbides form at above 500°C temperature.

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“…To solve this problem, a coating of a protective layer on the PP substrate was ruminated for avoiding the direct attachment between TiO 2 nanoparticles and the PP substrate. An electroless Ni-P coating on PP has received considerable attention due to its outstanding properties such as excellent corrosion and fouling resistance [18], high hardness and wear resistance [19], as well as low cost and manufacturing ease [20]. The basic component for the electroless bath includes a metal ion source, a reducing agent, complexing agent (s), a bath stabilizer, and a pH-adjusting solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Floating Photocatalyst <i>via</i> Electroless Ni-P-TiO<sub>2</sub> Composite Plating on Polypropylene Balls for Wastewater Treatment

Nijpanich

Kamimoto

Hagio

et al. 2019

J. of Wat. & Envir. Tech.

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Application of photocatalysts is among the most promising methods to eliminate organic pollutants in wastewater. A photocatalytic reaction, which involves the generation of reactive radicals from the reaction on the photocatalyst's surface and their interaction with organic molecules, can degrade organic pollutants. Titanium dioxide (TiO 2 ) is a well-known photocatalyst because it has low toxicity and cost including high chemical stability. However, it cannot be efficiently activated in water because of the difficulty in adsorbing ultraviolet light. In this work, a floating photocatalyst was prepared by combining TiO 2 , Ni-P plating, and a polypropylene (PP) hollow ball substrate. An Ni-P coating was electrolessly deposited on the PP hollow ball in the presence of TiO 2 . The prepared photocatalyst was characterized using X-ray diffraction and scanning electron microscopy-energy-dispersive X-ray spectroscopy. The PP hollow ball substrate was sufficiently covered with the Ni-P coating and Ti was confirmed to be contained in the Ni-P coating. The obtained specimen floated when placed in aqueous solutions and its photocatalytic activity was confirmed through degradation of methylene blue. In addition, the Ni-P plating was found to protect PP from degrading by photocatalytic activity of the TiO 2 .

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The process of formation of amorphous Ni-P layers made by electroless deposition

Cited by 19 publications

References 3 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

Study on Improvement of Mechanical Properties after Heat Treatment of Hard Chromium Electrodeposits with Additives

Preparation of a Floating Photocatalyst <i>via</i> Electroless Ni-P-TiO<sub>2</sub> Composite Plating on Polypropylene Balls for Wastewater Treatment

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