Hot corrosion resistant coatings
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United States of America Patent
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Feb 1, 1983
Issued Date -
N/A
app pub date -
Feb 1, 1982
filing date -
Feb 11, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coated article and method for producing the coated article are described. The article is provided with a coating system which provides protection against hot corrosion at moderate temperatures (1200-1700.degree. F.). An overlay coating based on a metal selected from the group consisting of iron, nickel or cobalt or mixtures thereof and containing chromium and optionally aluminum, yttrium and/or hafnium is applied to the article to be protected. A silicon rich surface zone is produced at the surface of the overlay coating. Methods including pack cementation and physical vapor deposition are described for producing the coating.
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