Layer-by-layer corrosion behavior of 316LN stainless steel with a gradient-nanostructured surface

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number106642
Journal / PublicationElectrochemistry Communications
Volume110
Online published19 Dec 2019
Publication statusPublished - Jan 2020
Externally publishedYes

Abstract

A 316LN stainless steel with a gradient-nanostructured surface layer was fabricated by rotationally accelerated shot peening (RASP). The thickness of this gradient layer was about 210 μm. Layer-by-layer electrochemical experiments confirmed that the layer of the gradient steel with the best corrosion resistance is found at a distance of 110 μm from the surface. The nanostructures and pits generated by RASP produced two opposing effects on its corrosion resistance: the nanocrystals and nano-twins facilitate the formation of a thick, compact passive film which resists corrosion, whereas the pits tend to destroy it. The passive films formed on the pits and on the smoothly nanostructured areas were 5.5 nm and 13.9 nm thick, respectively.

Research Area(s)

  • Corrosion resistance, Gradient structure, Passive film, Stainless steel