The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion

Zheng Hua Zheng; Yong Yao Lv; Hui Ping Bai

doi:10.4028/www.scientific.net/AMR.538-541.354

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541The Rehealing Ability of Oxide Scales on K52...

The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion

Abstract:

The rehealing ability of the oxide scales on sputter-deposited Ni-based K52 nanocrystalline coatings after pitting corrosion had been studied by polarization curves in 3.5% NaCl solution. The results indicated that the oxide scales formed on the nano-coatings exhibited excellent rehealing ability after pitting corrosion, and the rehealing oxide scales still had high corrosion resistance. The rehealing ability was declined with longer immersion time in the chloride solution. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides. The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr₂O₃ and TiO₂ and the internal oxide layer was Al₂O₃.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

354-358

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.354

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Online since:

June 2012

Authors:

Zheng Hua Zheng, Yong Yao Lv, Hui Ping Bai

Keywords:

Nanocrystalline Coating, Pitting Corrosion, Rehealing, Sputter-Deposited

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