Effect of NH 4HF 2 on deposition of alkaline electroless Ni-P coatings as a chromium-free pre-treatment for magnesium

A. A. Zuleta; E. Correa; M. Sepúlveda; L. Guerra; J. G. Castaño; F. Echeverría; P. Skeldon; G. E. Thompson

doi:10.1016/j.corsci.2011.10.028

Effect of NH ₄HF ₂ on deposition of alkaline electroless Ni-P coatings as a chromium-free pre-treatment for magnesium

A. A. Zuleta, E. Correa, M. Sepúlveda, L. Guerra, J. G. Castaño, F. Echeverría, P. Skeldon, G. E. Thompson

Research output: Contribution to journal › Article in an indexed scientific journal › peer-review

34 Scopus citations

Abstract

An alkaline electroless treatment that forms a low-phosphorus Ni-P coating on magnesium is described. The treatment is shown to provide a suitable base for deposition of a high-phosphorus, electroless nickel coating using a slightly acidic bath. The composition of the alkaline bath was selected to limit the corrosion of the substrate during coating and to avoid the utilization of chromate ions or hydrofluoric acid. An optimal amount of NH ₄HF ₂ is identified that provides a relatively thin Ni-P coating, with the subsequently-deposited, high-phosphorus coating enhancing the corrosion resistance of the magnesium in sodium chloride solution.

Original language	English
Pages (from-to)	194-200
Number of pages	7
Journal	Corrosion Science
Volume	55
DOIs	https://doi.org/10.1016/j.corsci.2011.10.028
State	Published - Feb 2012
Externally published	Yes

Bibliographical note

Funding Information:
The authors are grateful to “Departamento Administrativo de Ciencia, Tecnología e Innovación–COLCIENCIAS”, University of Antioquia and University of Manchester for financial assistance to the Project 111545221131 . The authors also thank the Engineering and Physical Sciences Research Council (UK) for financial support (Programme Grant: LATEST2 ).

Keywords

A. Magnesium
A. Metal coating
B. Polarization
B. SEM
C. Kinetic parameters

Access to Document

10.1016/j.corsci.2011.10.028

Cite this

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title = "Effect of NH 4HF 2 on deposition of alkaline electroless Ni-P coatings as a chromium-free pre-treatment for magnesium",

abstract = "An alkaline electroless treatment that forms a low-phosphorus Ni-P coating on magnesium is described. The treatment is shown to provide a suitable base for deposition of a high-phosphorus, electroless nickel coating using a slightly acidic bath. The composition of the alkaline bath was selected to limit the corrosion of the substrate during coating and to avoid the utilization of chromate ions or hydrofluoric acid. An optimal amount of NH 4HF 2 is identified that provides a relatively thin Ni-P coating, with the subsequently-deposited, high-phosphorus coating enhancing the corrosion resistance of the magnesium in sodium chloride solution.",

keywords = "A. Magnesium, A. Metal coating, B. Polarization, B. SEM, C. Kinetic parameters",

author = "Zuleta, {A. A.} and E. Correa and M. Sep{\'u}lveda and L. Guerra and Casta{\~n}o, {J. G.} and F. Echeverr{\'i}a and P. Skeldon and Thompson, {G. E.}",

note = "Funding Information: The authors are grateful to “Departamento Administrativo de Ciencia, Tecnolog{\'i}a e Innovaci{\'o}n–COLCIENCIAS”, University of Antioquia and University of Manchester for financial assistance to the Project 111545221131 . The authors also thank the Engineering and Physical Sciences Research Council (UK) for financial support (Programme Grant: LATEST2 ).",

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AU - Zuleta, A. A.

AU - Correa, E.

AU - Sepúlveda, M.

AU - Guerra, L.

AU - Castaño, J. G.

AU - Echeverría, F.

AU - Skeldon, P.

AU - Thompson, G. E.

N1 - Funding Information: The authors are grateful to “Departamento Administrativo de Ciencia, Tecnología e Innovación–COLCIENCIAS”, University of Antioquia and University of Manchester for financial assistance to the Project 111545221131 . The authors also thank the Engineering and Physical Sciences Research Council (UK) for financial support (Programme Grant: LATEST2 ).

PY - 2012/2

Y1 - 2012/2

N2 - An alkaline electroless treatment that forms a low-phosphorus Ni-P coating on magnesium is described. The treatment is shown to provide a suitable base for deposition of a high-phosphorus, electroless nickel coating using a slightly acidic bath. The composition of the alkaline bath was selected to limit the corrosion of the substrate during coating and to avoid the utilization of chromate ions or hydrofluoric acid. An optimal amount of NH 4HF 2 is identified that provides a relatively thin Ni-P coating, with the subsequently-deposited, high-phosphorus coating enhancing the corrosion resistance of the magnesium in sodium chloride solution.

AB - An alkaline electroless treatment that forms a low-phosphorus Ni-P coating on magnesium is described. The treatment is shown to provide a suitable base for deposition of a high-phosphorus, electroless nickel coating using a slightly acidic bath. The composition of the alkaline bath was selected to limit the corrosion of the substrate during coating and to avoid the utilization of chromate ions or hydrofluoric acid. An optimal amount of NH 4HF 2 is identified that provides a relatively thin Ni-P coating, with the subsequently-deposited, high-phosphorus coating enhancing the corrosion resistance of the magnesium in sodium chloride solution.

KW - A. Magnesium

KW - A. Metal coating

KW - B. Polarization

KW - B. SEM

KW - C. Kinetic parameters

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DO - 10.1016/j.corsci.2011.10.028

M3 - Artículo en revista científica indexada

AN - SCOPUS:83555168207

SN - 0010-938X

VL - 55

SP - 194

EP - 200

JO - Corrosion Science

JF - Corrosion Science

ER -