The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized steel with passive film formed in hot air increases both dry and wet adhesion strength of the epoxy coating compared to pretreatment with passive film formed in boiling water and chromate coating. The overall increase of wet adhesion for this sample was maintained throughout the whole investigated time period. It was shown that the change in adhesion of epoxy coating on a chromate coating is smallest of all investigated samples, although the initial value of adhesion on this surface had the lowest value. The corrosion stability of coated Zn samples pretreated by different methods, was investiga...ted by electrochemical impedance spectroscopy and in the initial time of exposure to NaCl the highest values of pore resistance were also obtained for the epoxy coating on Zn pretreated in hot air, whereas the epoxy coating on a HDG steel with a chromate coating showed the smallest change in electrochemical properties (pore resistance, coating capacitance, charge-transfer resistance) during prolonged exposure time.
Keywords:
Adhesion / Corrosion / EIS / Epoxy coatings / Hot-dip galvanized steel / Passive films
Source:
Progress in Organic Coatings, 2007, 58, 4, 323-330
TY - JOUR
AU - Bajat, Jelena
AU - Mišković-Stanković, Vesna
AU - Bibić, Nataša M.
AU - Dražić, Dragutin M.
PY - 2007
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4331
AB - The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized steel with passive film formed in hot air increases both dry and wet adhesion strength of the epoxy coating compared to pretreatment with passive film formed in boiling water and chromate coating. The overall increase of wet adhesion for this sample was maintained throughout the whole investigated time period. It was shown that the change in adhesion of epoxy coating on a chromate coating is smallest of all investigated samples, although the initial value of adhesion on this surface had the lowest value. The corrosion stability of coated Zn samples pretreated by different methods, was investigated by electrochemical impedance spectroscopy and in the initial time of exposure to NaCl the highest values of pore resistance were also obtained for the epoxy coating on Zn pretreated in hot air, whereas the epoxy coating on a HDG steel with a chromate coating showed the smallest change in electrochemical properties (pore resistance, coating capacitance, charge-transfer resistance) during prolonged exposure time.
PB - Elsevier
T2 - Progress in Organic Coatings
T1 - The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel
VL - 58
IS - 4
SP - 323
EP - 330
DO - 10.1016/j.porgcoat.2007.01.011
ER -
@article{
author = "Bajat, Jelena and Mišković-Stanković, Vesna and Bibić, Nataša M. and Dražić, Dragutin M.",
year = "2007",
abstract = "The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized steel with passive film formed in hot air increases both dry and wet adhesion strength of the epoxy coating compared to pretreatment with passive film formed in boiling water and chromate coating. The overall increase of wet adhesion for this sample was maintained throughout the whole investigated time period. It was shown that the change in adhesion of epoxy coating on a chromate coating is smallest of all investigated samples, although the initial value of adhesion on this surface had the lowest value. The corrosion stability of coated Zn samples pretreated by different methods, was investigated by electrochemical impedance spectroscopy and in the initial time of exposure to NaCl the highest values of pore resistance were also obtained for the epoxy coating on Zn pretreated in hot air, whereas the epoxy coating on a HDG steel with a chromate coating showed the smallest change in electrochemical properties (pore resistance, coating capacitance, charge-transfer resistance) during prolonged exposure time.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel",
volume = "58",
number = "4",
pages = "323-330",
doi = "10.1016/j.porgcoat.2007.01.011"
}
Bajat, J., Mišković-Stanković, V., Bibić, N. M.,& Dražić, D. M.. (2007). The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel. in Progress in Organic Coatings
Elsevier., 58(4), 323-330.
https://doi.org/10.1016/j.porgcoat.2007.01.011
Bajat J, Mišković-Stanković V, Bibić NM, Dražić DM. The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel. in Progress in Organic Coatings. 2007;58(4):323-330.
doi:10.1016/j.porgcoat.2007.01.011 .
Bajat, Jelena, Mišković-Stanković, Vesna, Bibić, Nataša M., Dražić, Dragutin M., "The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel" in Progress in Organic Coatings, 58, no. 4 (2007):323-330,
https://doi.org/10.1016/j.porgcoat.2007.01.011 . .
