Formation of electroless Ni-B on bifluoride-activated magnesium and AZ91D alloy

E. Correa; A. A. Zuleta; L. Guerra; J. G. Castaño; F. Echeverría; A. Baron-Wiecheć; P. Skeldon; G. E. Thompson

doi:10.1149/2.012309jes

Formation of electroless Ni-B on bifluoride-activated magnesium and AZ91D alloy

E. Correa, A. A. Zuleta, L. Guerra, J. G. Castaño, F. Echeverría, A. Baron-Wiecheć, P. Skeldon, G. E. Thompson

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Abstract

Previous studies of the authors have reported the formation of electroless Ni-B coatings on magnesium and AZ91D magnesium alloy using a chrome-free process. The substrates were pre-treated by grit-blasting and etching. In the present study, the influence of an activation stage in NH₄HF ₂ solution is investigated. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy and ion beam analysis are employed to determine the morphology, structure and composition of the treated surfaces at different stages of the electroless process. The results indicate that activation has relatively little influence on the growth rate and properties of the final coatings. However, it accelerates the coverage of the surface by Ni-B nodules at the start of the electroless treatment and, in the same period, reduces the electrochemical potential, the latter suggesting inhibition of corrosion of the substrate. Further, activation reduced the oxygen content of surfaces and led to formation of N-H species. Comparison with the earlier studies indicated that activation is of secondary importance to grit-blasting and etching for the generation of uniform coatings.

Original language	English
Pages (from-to)	D327-D336
Journal	Journal of the Electrochemical Society
Volume	160
Issue number	9
DOIs	https://doi.org/10.1149/2.012309jes
State	Published - 2013
Externally published	Yes

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title = "Formation of electroless Ni-B on bifluoride-activated magnesium and AZ91D alloy",

abstract = "Previous studies of the authors have reported the formation of electroless Ni-B coatings on magnesium and AZ91D magnesium alloy using a chrome-free process. The substrates were pre-treated by grit-blasting and etching. In the present study, the influence of an activation stage in NH4HF 2 solution is investigated. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy and ion beam analysis are employed to determine the morphology, structure and composition of the treated surfaces at different stages of the electroless process. The results indicate that activation has relatively little influence on the growth rate and properties of the final coatings. However, it accelerates the coverage of the surface by Ni-B nodules at the start of the electroless treatment and, in the same period, reduces the electrochemical potential, the latter suggesting inhibition of corrosion of the substrate. Further, activation reduced the oxygen content of surfaces and led to formation of N-H species. Comparison with the earlier studies indicated that activation is of secondary importance to grit-blasting and etching for the generation of uniform coatings.",

author = "E. Correa and Zuleta, {A. A.} and L. Guerra and Casta{\~n}o, {J. G.} and F. Echeverr{\'i}a and A. Baron-Wieche{\'c} and P. Skeldon and Thompson, {G. E.}",

year = "2013",

doi = "10.1149/2.012309jes",

language = "英语",

volume = "160",

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T1 - Formation of electroless Ni-B on bifluoride-activated magnesium and AZ91D alloy

AU - Correa, E.

AU - Zuleta, A. A.

AU - Guerra, L.

AU - Castaño, J. G.

AU - Echeverría, F.

AU - Baron-Wiecheć, A.

AU - Skeldon, P.

AU - Thompson, G. E.

PY - 2013

Y1 - 2013

N2 - Previous studies of the authors have reported the formation of electroless Ni-B coatings on magnesium and AZ91D magnesium alloy using a chrome-free process. The substrates were pre-treated by grit-blasting and etching. In the present study, the influence of an activation stage in NH4HF 2 solution is investigated. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy and ion beam analysis are employed to determine the morphology, structure and composition of the treated surfaces at different stages of the electroless process. The results indicate that activation has relatively little influence on the growth rate and properties of the final coatings. However, it accelerates the coverage of the surface by Ni-B nodules at the start of the electroless treatment and, in the same period, reduces the electrochemical potential, the latter suggesting inhibition of corrosion of the substrate. Further, activation reduced the oxygen content of surfaces and led to formation of N-H species. Comparison with the earlier studies indicated that activation is of secondary importance to grit-blasting and etching for the generation of uniform coatings.

AB - Previous studies of the authors have reported the formation of electroless Ni-B coatings on magnesium and AZ91D magnesium alloy using a chrome-free process. The substrates were pre-treated by grit-blasting and etching. In the present study, the influence of an activation stage in NH4HF 2 solution is investigated. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy and ion beam analysis are employed to determine the morphology, structure and composition of the treated surfaces at different stages of the electroless process. The results indicate that activation has relatively little influence on the growth rate and properties of the final coatings. However, it accelerates the coverage of the surface by Ni-B nodules at the start of the electroless treatment and, in the same period, reduces the electrochemical potential, the latter suggesting inhibition of corrosion of the substrate. Further, activation reduced the oxygen content of surfaces and led to formation of N-H species. Comparison with the earlier studies indicated that activation is of secondary importance to grit-blasting and etching for the generation of uniform coatings.

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DO - 10.1149/2.012309jes

M3 - 文章

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SN - 0013-4651

VL - 160

SP - D327-D336

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 9

ER -

Formation of electroless Ni-B on bifluoride-activated magnesium and AZ91D alloy

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