Evaluation of morphology, wear and corrosion resistance of ZrO 2 -Al 2 O 3 /Ni coatings deposited on carbon steel substrates with flame spraying
ABSTRACT: The morphology, wear and corrosion resistance of bilayer coatings elaborated by flame spraying on AISI SAE 1020 substrates are reported. The first layer (bond coat) is a nickel-base alloy (CPM 1205™), and the second is a compound of ZrO2-36 wt.% of Al2O3 (MetaCeram 25088͐...
Guardado en:
| Autores principales: | , , , , |
|---|---|
| Lenguaje: | English |
| Publicado: |
Universidad de Tarapacá.
2017
|
| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-33052017000400721 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | ABSTRACT: The morphology, wear and corrosion resistance of bilayer coatings elaborated by flame spraying on AISI SAE 1020 substrates are reported. The first layer (bond coat) is a nickel-base alloy (CPM 1205™), and the second is a compound of ZrO2-36 wt.% of Al2O3 (MetaCeram 25088™). The ceramic coating was deposited using oxidizing and super oxidizing flames, obtained from the fuel/comburent ratio of 1: 2.8 and 1: 4.3 respectively, at projection distances of 8, 9 and 10cm. The corrosion resistance was evaluated by electrochemical impedance spectroscopy (EIS), wear resistance was analyzed using a tribometer MicroTest in the ball-disc configuration, and the morphology was studied using scanning electron microscopy (SEM). The results showed a varied surface morphology of these coatings and the presence of bimodal areas formed by nanometric unmelted particles surrounded by melted particles. The wear resistance and Vickers microhardness of the ceramic coatings did not vary significantly with changes to the type of flame used and spray distance. By comparing the corrosion resistance of the substrate (AISI SAE 1020) and the coated samples, a significant increase of approximately 27 times was observed for these; moreover, it was reported that for coatings obtained using a super oxidizing flame, resistance to polarization increased with increasing spray distance, and for the oxidizing flame, the opposite behavior was observed. Overall, the results show the versatility of the thermal spray flame technique in forming bilayer coatings of ZrO2-Al2O3/Ni that efficiently protect the surfaces of steel AISI SAE 1020 when exposed to corrosive and erosive environments. |
|---|