Characterization of the Corrosion of Nanostructured 17-4PH Stainless Steel by Surface Mechanical Attrition Treatment (SMAT)

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

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Detail(s)

Original languageEnglish
Pages (from-to)2454–2471
Number of pages18
Journal / PublicationAnalytical Letters
Volume52
Issue number16
Online published6 May 2019
Publication statusPublished - 2019

Abstract

The corrosion properties of nanostructured 17-4PH stainless steel facilitated by a surface mechanical attrition treatment (SMAT) process were studied using electrochemical measurements in 0.6 M NaCl aqueous solution. The microstructure of the surface layer was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results demonstrated the formation of a nanostructured surface layer on the surface of the material. By the combination of SMAT and low-temperature annealing processes, the potentiodynamic polarization measurements and X-ray photoelectron spectroscopy (XPS) spectra demonstrated an improvement in the corrosion resistance of 17-4PH stainless steel with a reduced corrosion current density of 0.241 mA/cm2 and a higher chromium content. The improved corrosion resistance may be attributed to the formation of nucleation sites through which chromium may freely move from the matrix to the upper surface and thereby form a protective oxide layer on the surface of the material.

Research Area(s)

  • 17-4PH stainless steel, electrochemical impedance spectroscopy, scanning electron microscopy, surface mechanical attrition treatment, X-ray diffraction, X-ray photoelectron spectroscopy