US EPA

4959348 

Journal Article 

Design of stainless steel porous surfaces by oxide reduction with hydrogen 

Badin, V; Diamanti, E; Foret, P; Horgnies, M; Darque-Ceretti, E 

2015 

1 

Materials & Design
ISSN: 0264-1275
EISSN: 1873-4197 

86 

765-770 

10.1016/j.matdes.2015.07.142 

WOS:000362862700097 

A new method to create porous surfaces on stainless steel by reducing oxide scales with hydrogen at 1100 degrees C has been investigated. Mercury Intrusion Porosimety (MIP) along with Scanning Electron Microscopy (SEM) have been used to successfully study the porosity of the surfaces. Two different sets of parameters led to different morphologies. The first type of surface results from a 5 min reduction of a wilstite FeO surface oxide layer and provides smooth micrometer scale pores with a Gaussian distribution size. The second type of surface results from a 3 h reduction of a chromium rich oxide layer and provides three different micrometer scale pore size distributions with burst morphology. The volume of the porosity has been compared to its precedent oxide scale volume. The non-stoichiometry of wfistite is believed to be the main factor influencing the difference in the pore creation mechanism as compared to the mechanism of reduction from chromium-rich oxide. (C) 2015 Elsevier Ltd. All rights reserved. 

Stainless steel; Surface; Porosity; Oxidation; Reduction; Hydrogen