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Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel

Authorized Users Only
2008
Authors
Bajat, Jelena
Mišković-Stanković, Vesna
Popić, Jovan
Dražić, Dragutin M.
Article (Published version)
,
Elsevier
Metadata
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Abstract
The influence of hot-dip galvanized steel (HDG) surface pretreatment with phosphate coatings on the corrosion stability and adhesion characteristics of epoxy coatings electrodeposited on HDG steel was investigated. Phosphate coatings were deposited on hot-dip galvanized steel from baths with different concentrations of NaF (0.1, 0.5 and 1.0 g dm-3) and at different temperatures (50, 65 and 80 °C). The influence of fluoride ion concentration in the phosphating bath, as well as the deposition temperature of the bath, on the adhesion characteristics and corrosion stability of epoxy coatings on phosphated HDG steel was investigated. The dry and wet adhesions were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test, while corrosion stability was investigated by electrochemical impedance spectroscopy (EIS). It was shown that under dry testing conditions all the samples exhibited very good adhesion. However, the different trends of adhesion loss of differen...t protective systems during exposure to corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for epoxy coating on hot-dip galvanized steel, while the phosphate pretreatments significantly increase the adhesion of epoxy coatings. The highest values of adhesion strength were obtained for epoxy coating on HDG steel modified by phosphate coating deposited at 65 °C with 0.5 g dm-3 NaF in the phosphating bath. EIS measurements in 3% NaCl solution are in accordance with adhesion measurements, i.e. greater values of charge-transfer resistance and smaller values of double-layer capacitance were obtained, as compared to other protective systems.

Keywords:
Adhesion / Electrochemical impedance spectroscopy / Phosphating / Hot-dip galvanized steel / Epoxy coatings
Source:
Progress in Organic Coatings, 2008, 63, 2, 201-208
Publisher:
  • Elsevier
Funding / projects:
  • Elektrohemijske karakteristike oksidnih i polimernih prevlaka na modifikovanim površinama metala (RS-142061)

DOI: 10.1016/j.porgcoat.2008.06.002

ISSN: 0300-9440

WoS: 000259069200009

Scopus: 2-s2.0-48649083606
[ Google Scholar ]
66
52
URI
https://cer.ihtm.bg.ac.rs/handle/123456789/4117
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
TY  - JOUR
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
AU  - Popić, Jovan
AU  - Dražić, Dragutin M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4117
AB  - The influence of hot-dip galvanized steel (HDG) surface pretreatment with phosphate coatings on the corrosion stability and adhesion characteristics of epoxy coatings electrodeposited on HDG steel was investigated. Phosphate coatings were deposited on hot-dip galvanized steel from baths with different concentrations of NaF (0.1, 0.5 and 1.0 g dm-3) and at different temperatures (50, 65 and 80 °C). The influence of fluoride ion concentration in the phosphating bath, as well as the deposition temperature of the bath, on the adhesion characteristics and corrosion stability of epoxy coatings on phosphated HDG steel was investigated. The dry and wet adhesions were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test, while corrosion stability was investigated by electrochemical impedance spectroscopy (EIS). It was shown that under dry testing conditions all the samples exhibited very good adhesion. However, the different trends of adhesion loss of different protective systems during exposure to corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for epoxy coating on hot-dip galvanized steel, while the phosphate pretreatments significantly increase the adhesion of epoxy coatings. The highest values of adhesion strength were obtained for epoxy coating on HDG steel modified by phosphate coating deposited at 65 °C with 0.5 g dm-3 NaF in the phosphating bath. EIS measurements in 3% NaCl solution are in accordance with adhesion measurements, i.e. greater values of charge-transfer resistance and smaller values of double-layer capacitance were obtained, as compared to other protective systems.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel
VL  - 63
IS  - 2
SP  - 201
EP  - 208
DO  - 10.1016/j.porgcoat.2008.06.002
ER  - 
@article{
author = "Bajat, Jelena and Mišković-Stanković, Vesna and Popić, Jovan and Dražić, Dragutin M.",
year = "2008",
abstract = "The influence of hot-dip galvanized steel (HDG) surface pretreatment with phosphate coatings on the corrosion stability and adhesion characteristics of epoxy coatings electrodeposited on HDG steel was investigated. Phosphate coatings were deposited on hot-dip galvanized steel from baths with different concentrations of NaF (0.1, 0.5 and 1.0 g dm-3) and at different temperatures (50, 65 and 80 °C). The influence of fluoride ion concentration in the phosphating bath, as well as the deposition temperature of the bath, on the adhesion characteristics and corrosion stability of epoxy coatings on phosphated HDG steel was investigated. The dry and wet adhesions were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test, while corrosion stability was investigated by electrochemical impedance spectroscopy (EIS). It was shown that under dry testing conditions all the samples exhibited very good adhesion. However, the different trends of adhesion loss of different protective systems during exposure to corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for epoxy coating on hot-dip galvanized steel, while the phosphate pretreatments significantly increase the adhesion of epoxy coatings. The highest values of adhesion strength were obtained for epoxy coating on HDG steel modified by phosphate coating deposited at 65 °C with 0.5 g dm-3 NaF in the phosphating bath. EIS measurements in 3% NaCl solution are in accordance with adhesion measurements, i.e. greater values of charge-transfer resistance and smaller values of double-layer capacitance were obtained, as compared to other protective systems.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel",
volume = "63",
number = "2",
pages = "201-208",
doi = "10.1016/j.porgcoat.2008.06.002"
}
Bajat, J., Mišković-Stanković, V., Popić, J.,& Dražić, D. M.. (2008). Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel. in Progress in Organic Coatings
Elsevier., 63(2), 201-208.
https://doi.org/10.1016/j.porgcoat.2008.06.002
Bajat J, Mišković-Stanković V, Popić J, Dražić DM. Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel. in Progress in Organic Coatings. 2008;63(2):201-208.
doi:10.1016/j.porgcoat.2008.06.002 .
Bajat, Jelena, Mišković-Stanković, Vesna, Popić, Jovan, Dražić, Dragutin M., "Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel" in Progress in Organic Coatings, 63, no. 2 (2008):201-208,
https://doi.org/10.1016/j.porgcoat.2008.06.002 . .

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