[article]
| Titre : |
Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments |
| Type de document : |
texte imprimé |
| Auteurs : |
A. Cristoforetti, Auteur ; M. Fedel, Auteur ; F. Deflorian, Auteur ; S. Rossi, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 859-873 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Adhésion
Coil coatings
Essais accélérés (technologie)
Essais de brouillard salin
Galvanisation
Revêtement de conversion
Revêtements:Peinture
Spectroscopie d'impédance électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Two different chemical pretreatments for hot-dip galvanized steel, typically used in the coil coating field, were considered comparing their electrochemical behavior (electrochemical impedance spectroscopy (EIS), potentiodynamic curves) after a morphological characterization of the deposited films. The wet and dry adhesion of the following deposited paint is tested employing neutral salt spray chamber test (NSST) and pull-off test. Despite these technologies being widely adopted in industrial plants, the literature lacks some relevant research about the actual improvement in durability, especially in the case of nitro-cobalt based conversion. This paper analyzes the factors affecting the protection provided by the deposited film and varying the principal production parameter, the immersion time in the chemical conversion solution, an optimization study was carried out. The better behavior of the titanium hexafluoride-based artificial conversions, with respect to the nitro-cobalt one, is highlighted. Such treatment analyzed as bare surface gives higher impedance modulus and lower corrosion current density compared to the second one. For both the technologies, the uselessness of longer treatment periods in terms of performance improvement is found. The results obtained from the electrochemical characterization are in accordance with the technological test on the painted samples, such as NSST, where the delamination rate is significantly higher for the substrate treated employing a nitro-cobalt-based bath. |
| Note de contenu : |
- EXPERIMENTAL METHODS AND MATERIALS
- RESULTS AND DISCUSSION : Morphology and composition - Free corrosion potential trend - Impedance spectra - Potentiodynamic polarization curves - Neutral salt spray chamber test, adhesion of painted samples
- Table 1 : Sample's production parameters and corresponding code
- Table 2 : Comparison between surface and cluster composition by EDXS analysis on T-300 sample
- Table 3 : Numerical data obtained from electrochemical measurements carried out in aerated conditions |
| DOI : |
https://doi.org/10.1007/s11998-021-00563-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-021-00563-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38081 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 859-873
[article]
|
Aller sur edunet
Accueil
Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)
