Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010001000024 |
Resumo: | The corrosion resistance of electrodeposited Cr and Ni-Mo coatings and the influence of heat treatment on the crystallographic structure, morphology and microhardness properties were investigated here. The characterisations were carried out using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) techniques. Corrosion tests were performed at room temperature in 10-1 mol dm-3 NaCl solutions and by potentiodynamic linear polarization technique.TheMo content in the layer and current efficiency increased with the molybdate ion concentration in the plating solution, while the surface morphology evolved from rough and homogeneous to cracked surface with the increase of the amount of Mo in the layer. The electrochemical corrosion tests showed that the Cr coatings have better corrosion resistance than the Ni-Mo coatings in chloride medium and that all the studied coatings corrode in chloride medium. Ni-13Mo coating has the nobler corrosion behavior among the studied Ni-Mo coatings. The microhardness of the Ni-13Mo coatings increased as the annealing temperature increased which is related with the precipitation of Ni, Ni4Mo and NiMo phases during the heat treatment of this coating. Ni-13Mo coating is a potential substitute for chromium coating in industrial applications when operating at temperatures higher than 100 ºC and good microhardness properties are required. |
id |
SBQ-2_f6883cb20a2b72b8d86cbb5663d16106 |
---|---|
oai_identifier_str |
oai:scielo:S0103-50532010001000024 |
network_acronym_str |
SBQ-2 |
network_name_str |
Journal of the Brazilian Chemical Society (Online) |
repository_id_str |
|
spelling |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatingsNi-MoCrelectrodepositioncorrosionheat treatmentmicrohardnessThe corrosion resistance of electrodeposited Cr and Ni-Mo coatings and the influence of heat treatment on the crystallographic structure, morphology and microhardness properties were investigated here. The characterisations were carried out using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) techniques. Corrosion tests were performed at room temperature in 10-1 mol dm-3 NaCl solutions and by potentiodynamic linear polarization technique.TheMo content in the layer and current efficiency increased with the molybdate ion concentration in the plating solution, while the surface morphology evolved from rough and homogeneous to cracked surface with the increase of the amount of Mo in the layer. The electrochemical corrosion tests showed that the Cr coatings have better corrosion resistance than the Ni-Mo coatings in chloride medium and that all the studied coatings corrode in chloride medium. Ni-13Mo coating has the nobler corrosion behavior among the studied Ni-Mo coatings. The microhardness of the Ni-13Mo coatings increased as the annealing temperature increased which is related with the precipitation of Ni, Ni4Mo and NiMo phases during the heat treatment of this coating. Ni-13Mo coating is a potential substitute for chromium coating in industrial applications when operating at temperatures higher than 100 ºC and good microhardness properties are required.Sociedade Brasileira de Química2010-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010001000024Journal of the Brazilian Chemical Society v.21 n.10 2010reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532010001000024info:eu-repo/semantics/openAccessLima-Neto,Pedro deCorreia,Adriana N.Vaz,Gustavo L.Casciano,Paulo N. S.eng2010-12-01T00:00:00Zoai:scielo:S0103-50532010001000024Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2010-12-01T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
title |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
spellingShingle |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings Lima-Neto,Pedro de Ni-Mo Cr electrodeposition corrosion heat treatment microhardness |
title_short |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
title_full |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
title_fullStr |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
title_full_unstemmed |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
title_sort |
Morphological, structural, microhardness and corrosion characterisations of electrodeposited Ni-Mo and Cr coatings |
author |
Lima-Neto,Pedro de |
author_facet |
Lima-Neto,Pedro de Correia,Adriana N. Vaz,Gustavo L. Casciano,Paulo N. S. |
author_role |
author |
author2 |
Correia,Adriana N. Vaz,Gustavo L. Casciano,Paulo N. S. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Lima-Neto,Pedro de Correia,Adriana N. Vaz,Gustavo L. Casciano,Paulo N. S. |
dc.subject.por.fl_str_mv |
Ni-Mo Cr electrodeposition corrosion heat treatment microhardness |
topic |
Ni-Mo Cr electrodeposition corrosion heat treatment microhardness |
description |
The corrosion resistance of electrodeposited Cr and Ni-Mo coatings and the influence of heat treatment on the crystallographic structure, morphology and microhardness properties were investigated here. The characterisations were carried out using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) techniques. Corrosion tests were performed at room temperature in 10-1 mol dm-3 NaCl solutions and by potentiodynamic linear polarization technique.TheMo content in the layer and current efficiency increased with the molybdate ion concentration in the plating solution, while the surface morphology evolved from rough and homogeneous to cracked surface with the increase of the amount of Mo in the layer. The electrochemical corrosion tests showed that the Cr coatings have better corrosion resistance than the Ni-Mo coatings in chloride medium and that all the studied coatings corrode in chloride medium. Ni-13Mo coating has the nobler corrosion behavior among the studied Ni-Mo coatings. The microhardness of the Ni-13Mo coatings increased as the annealing temperature increased which is related with the precipitation of Ni, Ni4Mo and NiMo phases during the heat treatment of this coating. Ni-13Mo coating is a potential substitute for chromium coating in industrial applications when operating at temperatures higher than 100 ºC and good microhardness properties are required. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010001000024 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010001000024 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532010001000024 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.21 n.10 2010 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318171474100224 |