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07469 Effects of Pre-Oxidation on the Hot-Corrosion Resistance of Pt-Modified Ni-Based Alloys and Coatings

Picture for 07469 Effects of Pre-Oxidation on the Hot-Corrosion Resistance of Pt-Modified Ni-Based Alloys and Co
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Product Number: 51300-07469-SG
ISBN: 07469 2007 CP
Author: Brian Gleeson and Vinay Deodeshmukh
Publication Date: 2007
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The effects of various pre-oxidation treatments on the Type II (i.e., 700ºC) hot corrosion resistance of novel Pt+Hf-modified ?'-Ni3Al + ?-Ni alloys and coatings were studied and compared to a state-of-theart Pt-modified ß-NiAl coating. The pre-oxidation treatments were carried out in air and in Ar atmospheres at temperatures of 700, 1080, and 1100oC and for times of 1, 6, and 24h. It was found that pre-oxidation in air at higher temperatures and for a shorter period was quite beneficial in improving hot corrosion resistance of the Pt+Hf-modified ?' + ? alloys and coatings. In fact, the results suggested that the oxide scale formed with such a treatment was much more protective than the Ar and longer-term air pre-oxidation treatments. It was also found that with an optimum pre-oxidation treatment, a Pt+Hfmodified ?'+? coating exhibited superior hot corrosion resistance compared to a Pt-modified ß coating.
The effects of various pre-oxidation treatments on the Type II (i.e., 700ºC) hot corrosion resistance of novel Pt+Hf-modified ?'-Ni3Al + ?-Ni alloys and coatings were studied and compared to a state-of-theart Pt-modified ß-NiAl coating. The pre-oxidation treatments were carried out in air and in Ar atmospheres at temperatures of 700, 1080, and 1100oC and for times of 1, 6, and 24h. It was found that pre-oxidation in air at higher temperatures and for a shorter period was quite beneficial in improving hot corrosion resistance of the Pt+Hf-modified ?' + ? alloys and coatings. In fact, the results suggested that the oxide scale formed with such a treatment was much more protective than the Ar and longer-term air pre-oxidation treatments. It was also found that with an optimum pre-oxidation treatment, a Pt+Hfmodified ?'+? coating exhibited superior hot corrosion resistance compared to a Pt-modified ß coating.
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