Crystallization mechanism and corrosion property of electroless nickel phosphorus coating during intermediate temperature oxidation

Sribalaji, M.; Arunkumar, P.; Babu, K. Suresh; Keshri, Anup Kumar

doi:10.1016/j.apsusc.2015.07.061

Cited by 55 publications

(31 citation statements)

References 26 publications

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“…Figure 2 shows the structural evolution of electroless Ni-P coatings as a function of heat treatment. As has already been shown in several studies 17,22,23 , the structure of as- results in comparison with hard chromium specimen, with exception to as-deposited condition.…”

supporting

confidence: 65%

“…In addition, all of the Ni-P heat treated coatings showed better As can be observed from Figure 1, there is an exothermic peak that takes place in the range of temperatures from 320ºC to 360ºC. This peak is massive referenced by several authors 18,22,23 as being the transformation of amorphous state to a complete crystalline structure of the electroless Ni-P alloys with high phosphorus content. Figure 2 shows the structural evolution of electroless Ni-P coatings as a function of heat treatment.…”

mentioning

confidence: 74%

“…This condition is proved to reach the structural stability. Some authors have observed the formation of NiO phase when the temperature overtake 450ºC, reducing the wear resistance of the Ni-P coatings 15,23 . It is consensus that relative high holding times (1 hour for instance) at temperatures above 450ºC makes a coarsening effect of nickel phosphides and nickel crystallites leading to an increasing mass loss during wear tests 18,[24][25][26] .…”

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confidence: 99%

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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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confidence: 65%

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confidence: 74%

mentioning

confidence: 99%

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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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“…Este resultado vai ao encontro da literatura [6,13,18] que descreve uma transformação estrutural de amorfo ou nano cristalino para uma estrutura totalmente cristalina em temperaturas entre 300ºC e 400ºC para revestimentos de Ni-P.…”

Section: Avaliação Física E Microestruturalunclassified

Influência Do Tratamento Térmico Na Resistência Ao Desgaste De Revestimentos De Níquel Químico Com Alto Teor De Fósforo

Goettems¹,

Ferreira²

2017

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoNo presente trabalho foi avaliada a resistência ao desgaste de revestimentos de níquel químico com alto teor de fósforo (9-10% P) após passar por três diferentes condições de tratamento térmico, incluindo a condição de como depositado, ou seja, sem tratamento posterior. Os tratamentos foram realizados nas temperaturas de 320ºC, 400ºC e 500ºC em diferentes tempos, sendo estas condições escolhidas com base no resultado do ensaio de calorimetria exploratória diferencial (DSC). Feito isso as amostras foram então caracterizadas através do ensaio de desgaste do tipo "ball on plate", para depois suas trilhas de desgaste serem avaliadas em microscópio. Ao final, chegou-se à conclusão de que o tratamento térmico afeta de forma positiva a resistência ao desgaste dos depósitos de Ni-P, tendo como 320ºC por 9 horas e 400ºC por 1 hora as condições que apresentaram o melhor resultado. Este fato se deve a transformação de sua estrutura amorfa para uma estrutura cristalina de níquel com precipitados de Ni 3 P ocorrida entre 320ºC e 360ºC, verificada através da difração de raios-X (DRX). Palavras-chave: Revestimento metálico; Resistência ao desgaste; Níquel químico; Tratamento térmico. EFFECT OF HEAT TREATMENT ON THE WEAR BEHAVIOUR OF ELECTROLESS HIGH PHOSPHORUS NICKEL COATING AbstractIn this present work was studied the influence of heat treatment on the wear resistance of electroless high phosphorus nickel coating (9-10% P wt.). Three different treatment conditions as well as untreated condition were evaluated at temperatures of 320ºC, 400ºC and 500ºC under different holding times. The selection of the heat treatment conditions was chosen considering the result 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 and the results showed 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 verified after X-ray analysis. Keywords: Metallic coatings; Wear resistance; Nickel electroless; Heat treatment. INTRODUÇÃONas últimas décadas houve um crescente aumento na busca por revestimentos metálicos com aplicação na engenharia capazes de apresentar boas propriedades mecânicas em situações severas de aplicação, incluindo-se neste grupo de propriedades a resistência ao desgaste, permitindo que seja possível aliar características especificas do substrato com outras em que só seja possível atingir através da aplicação de outro material.Um tipo de revestimento que está recebendo atenção especial nos últimos anos devido à sua grande versatilidade é o níquel químico, que vem ganhando mais e mais espaço em diversos setores da indústria tais como automotiva, alimentícia, extrativa, óleo...

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“…Electroless nickel-phosphorus (Ni-P) plating is one of the most effective surface technology for Mg alloys, since it has excellent comprehensive advantages in low-cost, efficient, corrosion resistance, and wear resistance [14, 15]. Therefore, electroless Ni-P coating plays an important role in the anti-corrosion field of Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

Liu

et al. 2018

Nanoscale Res Lett

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To improve the corrosion resistance and wear resistance of electroless nickel-phosphorus (Ni-P) coating on magnesium (Mg) alloy. Ni-P-Al2O3 coatings were produced on Mg alloy from a composite plating bath. The optimum Al2O3 concentration was determined by the properties of plating bath and coatings. Morphology growth evolution of Ni-P-Al2O3 composite coatings at different times was observed by using a scanning electronic microscope (SEM). The results show that nano-Al2O3 particles may slow down the replacement reaction of Mg and Ni2+ in the early stage of the deposition process, but it has almost no effect on the rate of Ni-P auto-catalytic reduction process. The anti-corrosion and micro-hardness tests of coatings reveal that the Ni-P-Al2O3 composite coatings exhibit better performance compared with Ni-P coating owing to more appropriate crystal plane spacing and grain size of Ni-P-Al2O3 coatings. Thermal shock test indicates that the Al2O3 particles have no effect on the adhesion of coatings. In addition, the service life of composite plating bath is 4.2 metal turnover, suggesting it has potential application in the field of magnesium alloy.

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Crystallization mechanism and corrosion property of electroless nickel phosphorus coating during intermediate temperature oxidation

Cited by 55 publications

References 26 publications

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

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

Influência Do Tratamento Térmico Na Resistência Ao Desgaste De Revestimentos De Níquel Químico Com Alto Teor De Fósforo

Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

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