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Comparative study on the corrosion behaviour of CNT-reinforced NiAl alloys in NaCl and Na2SO4 solutions.
- Source :
- Journal of Materials Science; Apr2023, Vol. 58 Issue 14, p6329-6342, 14p, 2 Black and White Photographs, 1 Diagram, 2 Charts, 13 Graphs
- Publication Year :
- 2023
-
Abstract
- Various electrochemical techniques were used to study the corrosion behaviour of the CNT-reinforced NiAl alloys under NaCl and Na<subscript>2</subscript>SO<subscript>4</subscript> environments. The potentiodynamic polarization curves revealed activation Tafel behaviour when the NiAl alloy specimens were immersed in NaCl solution while passivation followed by slight development of transpassivation resulted under Na<subscript>2</subscript>SO<subscript>4</subscript> environment. The reinforcement of pure NiAl alloy with up to 1.0 wt.% CNT increased the corrosion rate from 0.10 to 0.63 mm/yr under NaCl environment, while under Na<subscript>2</subscript>SO<subscript>4</subscript> environment, the corrosion rate increased from 0.04 to 0.12 mm/yr. The observed increase in corrosion rate with an increase in CNT reinforcement (under both NaCl and Na<subscript>2</subscript>SO<subscript>4</subscript> environments) suggested that the reinforcement of NiAl alloys with CNT reduced the corrosion resistance of NiAl. The X-ray diffraction analysis revealed that the corrosion products consisted of oxides including Al<subscript>2</subscript>O<subscript>3</subscript> under NaCl environment, while scanning electron microscope analysis showed a porous passive layer on the surface of the alloy specimens immersed in Na<subscript>2</subscript>SO<subscript>4</subscript> solution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 58
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 162993253
- Full Text :
- https://doi.org/10.1007/s10853-023-08405-7