Stainless steel surface alloying process with molybdenum or ruthenium by high-energy excimer laser: structural, electrochemical, and corrosion properties

Luc Beaunier; Christian Pasquier; Francoise Pillier; Patricia Laurens

doi:10.1117/12.281105

18 August 1997 Stainless steel surface alloying process with molybdenum or ruthenium by high-energy excimer laser: structural, electrochemical, and corrosion properties

Luc Beaunier, Christian Pasquier, Francoise Pillier, Patricia Laurens

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Proceedings Volume 3097, Lasers in Material Processing; (1997) https://doi.org/10.1117/12.281105
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

Chemical transformations on stainless steel surfaces (304 AISI) are obtained by melting with an excimer laser. The very high quenching rate allows to create a thin continuous metastable gradient in composition and structure by opposition to other melting techniques which promote multiphase layer. The mechanical properties of the bulk are maintained and the external layer is chemically modified for a better resistance to environmental aggressivity. Molybdenum is used for corrosion protection and ruthenium for cathodic and anodic properties. The composition is analyzed on cross-sections obtained by ultramicrotomy. A continuous gradient approximately 500 nm (nanometer) of Mo or Ru with decreasing grain size (< 0,3 micrometer compared to 10 - 20 micrometers for 304 AISI) is observed. Mo and Ru surface alloys show an important beneficial effect from cathodic and transpassive potential range.

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Luc Beaunier, Christian Pasquier, Francoise Pillier, and Patricia Laurens "Stainless steel surface alloying process with molybdenum or ruthenium by high-energy excimer laser: structural, electrochemical, and corrosion properties", Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); https://doi.org/10.1117/12.281105

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KEYWORDS

Molybdenum

Ruthenium

Corrosion

Excimer lasers

Scanning electron microscopy

Laser processing

Metals

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