Mechanism of and method to avoid discoloration of stainless steel surfaces in laser cleaning

Y. F. Lu, W. D. Song, M. H. Hong, T. C. Chong, T. S. Low

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In laser cleaning of stainless steel surfaces, the discoloration takes place on the surfaces irradiated by excimer lasers in the air as laser fluence and pulse number exceed a discoloration threshold. The color of stainless steel surfaces changes to that of γ-Fe2O3. Based on Auger Electron Spectroscopy analyses and optical microscopic observations, γ-Fe2O3 and Fe3O4 are formed on the stainless steel surface in laser cleaning in the air. Since laser can induce high temperature rise in stainless steel surfaces, the above phenomenon can be explained by a thermochemical reaction between oxygen in the air and the stainless steel. With increasing laser fluences, the temperature rise in the irradiated area of stainless steel surface increases, which enhances oxygen diffusion into the surface and oxidation reaction within the irradiated area. In order to avoid discoloration of stainless steel surfaces, a vacuum system was used to reduce the oxidation reaction between oxygen and stainless steel.

Original languageEnglish (US)
Pages (from-to)573-578
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume64
Issue number6
DOIs
StatePublished - Jun 1997

Fingerprint

discoloration
Discoloration
Stainless Steel
cleaning
stainless steels
Cleaning
Stainless steel
Lasers
lasers
Oxygen
air
fluence
oxygen
Air
Oxidation
oxidation
vacuum systems
Excimer lasers
Auger electron spectroscopy
excimer lasers

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Mechanism of and method to avoid discoloration of stainless steel surfaces in laser cleaning. / Lu, Y. F.; Song, W. D.; Hong, M. H.; Chong, T. C.; Low, T. S.

In: Applied Physics A: Materials Science and Processing, Vol. 64, No. 6, 06.1997, p. 573-578.

Research output: Contribution to journalArticle

Lu, Y. F. ; Song, W. D. ; Hong, M. H. ; Chong, T. C. ; Low, T. S. / Mechanism of and method to avoid discoloration of stainless steel surfaces in laser cleaning. In: Applied Physics A: Materials Science and Processing. 1997 ; Vol. 64, No. 6. pp. 573-578.
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