| Titre : |
Optimization of phosphate coating properties on steel sheet for superior paint performance |
| Type de document : |
texte imprimé |
| Auteurs : |
Nitu Rani, Auteur ; Arun K. Singh, Auteur ; Sarfaraz Alam, Auteur ; N. Bandyopadhyay, Auteur ; M. B. Denys, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 629-636 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésion
Anticorrosion
Dépôt électrolytique
Phosphate de zinc
Revêtements
Spectroscopie d'impédance électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The adhesion of electrodeposition (ED) paint on steel sheets for automobiles is highly influenced by the properties of the zinc phosphate coating which is used to improve its corrosion resistance. In the present study, a steel surface was pretreated with two types of zinc phosphate formulations followed by ED painting. The surface morphology, crystal plane, and porosity properties of phosphate coating on steel samples were studied by scanning electron microscope, X-ray diffraction, and electron probe microanalyzer, respectively. The corrosion resistance of painted samples was evaluated by an accelerated corrosion test as well as by electrochemical techniques like cathodic disbonding and AC–DC–AC tests. The phosphate coating enriched with a phosphophyllite structure showed small globular crystals with less porosity, whereas a hopeite structure showed coarse crystals with high porosity and comparatively thicker coating. The maximum corrosion resistance was observed in the painted sample, where the phosphate coating comprised a phosphophyllite structure. On the other hand, the painted samples phosphated with a predominantly hopeite structure showed inferior corrosion resistance performance. The unphosphated sample showed severe degradation in paint adhesion and corrosion resistance, which substantiates the importance of phosphate pretreatment. |
| Note de contenu : |
- EXPERIMENTAL : Sample preparation - Phosphate coating evaluation - Corrosion resistance performance of ED coating
- RESULTS AND DISCUSSION : Properties of phosphabe bath - Properties of phosphate coating - Corrosion resistance properties of ED-painted samples |
| DOI : |
10.1007/s11998-012-9395-9 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9395-9.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16034 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 5 (09/2012) . - p. 629-636
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