Structural evolution of electroless Ni-P coating on Al-12wt% Si alloy during heat treatment at high temperatures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F09%3A00021427" target="_blank" >RIV/60461373:22310/09:00021427 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Structural evolution of electroless Ni-P coating on Al-12wt% Si alloy during heat treatment at high temperatures

Popis výsledku v původním jazyce

The work is concerned with the high-temperature heat treatment of an Al-12 wt.% Si alloy coated by an electroless Ni-P layer. The electroless deposition took place on a pre-treated substrate in a bath containing nickel hypophosphite, nickel lactate and lactic acid. Resulting Ni-P deposit showed a thickness of about 8 mm. The coated samples were heat-treated at 200-550 degrees C/1-24 h. LM, SEM, EDS and XRD were used to investigate phase transformations. Adherence to the substrate was estimated from thescratch test and microhardness of the heat-treated layers was also measured. It is found that various phase transformations occur, as both temperature and annealing time increase. These include (1) amorphous Ni-P -> Ni + Ni3P, (2) Al + Ni -> Al3Ni, (3) Ni3P -> Ni12P5 + Ni, (4) Ni12P5 -> Ni2P + Ni, and (5) Al3Ni + Ni -> Al3Ni2. The formation of intermetallic phases, particularly Al3Ni2, leads to significant surface hardening, however, too thick layers of intermetallics reduce the adherenc

Název v anglickém jazyce

Structural evolution of electroless Ni-P coating on Al-12wt% Si alloy during heat treatment at high temperatures

Popis výsledku anglicky

The work is concerned with the high-temperature heat treatment of an Al-12 wt.% Si alloy coated by an electroless Ni-P layer. The electroless deposition took place on a pre-treated substrate in a bath containing nickel hypophosphite, nickel lactate and lactic acid. Resulting Ni-P deposit showed a thickness of about 8 mm. The coated samples were heat-treated at 200-550 degrees C/1-24 h. LM, SEM, EDS and XRD were used to investigate phase transformations. Adherence to the substrate was estimated from thescratch test and microhardness of the heat-treated layers was also measured. It is found that various phase transformations occur, as both temperature and annealing time increase. These include (1) amorphous Ni-P -> Ni + Ni3P, (2) Al + Ni -> Al3Ni, (3) Ni3P -> Ni12P5 + Ni, (4) Ni12P5 -> Ni2P + Ni, and (5) Al3Ni + Ni -> Al3Ni2. The formation of intermetallic phases, particularly Al3Ni2, leads to significant surface hardening, however, too thick layers of intermetallics reduce the adherenc

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Surface Science

ISSN

0169-4332

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

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Kód UT WoS článku

000261972100048

EID výsledku v databázi Scopus

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