Transcription of STAINLESS STEEL Surface Analysis - Material Interface, Inc
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STAINLESS STEEL Surface Analysis - Material Interface, Inc
AES and XPS Analysis of the passivation layer on STAINLESS STEEL can help determine how well it willresist J. Kerber* Material Interface Inc. Sussex, WisconsinJohn Tverberg** Trent Tube Inc. East Troy, Wisconsin Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS)are valuable techniques for analyzingthe Surface of STAINLESS steels to establishtheir ability to resist corrosion. AES identifies theatoms in a layer by measuring the characteristicAuger electron energy, which is emitted in stepsfrom an inner atomic shell. XPS (also known asESCS, electron spectroscopy for chemical Analysis )measures the energy spectra of electrons emittedwhen the Surface is exposed to of these techniques have an Analysis depthof approximately 2 to 4 nm (20 to 40 angstroms, orabout ten atom layers); shallower measurementscan be made under specially designed experimentalconditions.
atoms. The passive layer is formed by an oxidation-reduction reaction in which the chromium and iron are oxidized, and the passivating agent is reduced.
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