Abstract
In this study, GJS-500-14 solution-strengthened ferritic ductile iron was subjected to successive hot-dip aluminizing (HDA) and austempering. The combination of these processes resulted in the formation of a thin Al2O3 layer on the iron surface, an intermetallic layer beneath the surface, and an ausferritic microstructure in the interior. Scanning electron microscopy-energy dispersive X-ray spectrometry and X-ray diffraction analyses allowed the qualitative identification of the intermetallics formed due to the aluminizing and their transformation after austempering. Corrosion properties of the final product were also evaluated by potentiodynamic polarization and salt spray corrosion tests, and the surfaces and subsurfaces of the coating layer were examined. The results revealed that this combined process improved the corrosion resistance of ductile iron and enhanced its mechanical properties.
| Original language | English |
|---|---|
| Pages (from-to) | 142-149 |
| Number of pages | 8 |
| Journal | Surface and Coatings Technology |
| Volume | 347 |
| DOIs | |
| Publication status | Published - 15 Aug 2018 |
Bibliographical note
Publisher Copyright:© 2018 Elsevier B.V.
Funding
This work was supported by Istanbul Technical University as a part of ITU Scientific Research Project with Grant No. 41008 . The authors greatly acknowledge Dr. Yavuz Sun and Dr. Hayrettin Ahlatci of Karabuk University for his valuable support during potentiodynamic polarization tests, and MSc. Mert Gunyuz for his help during salt spray corrosion tests.
| Funders | Funder number |
|---|---|
| International Technological University | |
| Istanbul Teknik Üniversitesi | 41008 |
Keywords
- Austempering
- Corrosion
- Ferritic ductile iron
- Hot-dip aluminizing
- Intermetallic