Corrosion of Fe-25 Cr Alloy with microconstituent additions of hafnium and platinum
Conference
·
OSTI ID:6669554
- Universal Energy Systems, Inc., Dayton, OH (US)
The study reported was performed with a view to understanding the effects of minor additions of Hf and Pt on the corrosion behavior of a model chromia former, Fe-25Cr. Bulk addition of Hf or Pt was made at 1 wt.% level to the base alloy, Fe-25 Cr, and the experimental alloys were made by an ingot metallurgy route. Coupons were machined from the as-cast rods or forged prismatic bars, and metallographically polished to 1 {mu} alumina. Multiple samples were exposed to an H{sub 2}/H{sub 2}S/H{sub 2}O/Ar gas mixture at 700{degrees}C for times up to 192 hrs. Planar and cross-sections of scales formed on the substrate alloys were examined using a scanning electron microscope with an energy dispersive x-ray spectrometer (SEM/EDAX). A uniform chromia scale formed initially. This scale was broken down locally and slowly by the overgrowth of sulfide rich nodules. The effects of minor additions of Hf or Pt on the growth and breakdown of protective chromia scales are discussed in this paper.
- OSTI ID:
- 6669554
- Report Number(s):
- CONF-890437--
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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Sun Sep 01 00:00:00 EDT 1991
· Corrosion (Houston); (United States)
·
OSTI ID:7116154
Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ALLOYS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
CORROSION
CORROSION RESISTANCE
CRACK PROPAGATION
ELECTRON MICROSCOPY
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
METALLOGRAPHY
MICROSCOPY
PLATINUM ADDITIONS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
PROTECTIVE COATINGS
SCALING
SCANNING ELECTRON MICROSCOPY
SPECTRA
STRESS CORROSION
X-RAY SPECTRA
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ALLOYS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
CORROSION
CORROSION RESISTANCE
CRACK PROPAGATION
ELECTRON MICROSCOPY
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
METALLOGRAPHY
MICROSCOPY
PLATINUM ADDITIONS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
PROTECTIVE COATINGS
SCALING
SCANNING ELECTRON MICROSCOPY
SPECTRA
STRESS CORROSION
X-RAY SPECTRA