A study of the apparent detrimental effect of a surface applied HfO sub 2 coating on the oxidation behavior of alloys

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085567· OSTI ID:5902395

Hou, P Y ^[1]; Stringer, J ^[2]

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1. Materials and Chemical Sciences Div., Lawrence Berkeley Lab., Berkeley, CA (US)
2. Electric Power Research Inst., Palo Alto, CA (US)

This paper reports on additions of reactive elements, such as Hf, Ce, Y, or Zr, which have a number of beneficial effects on the oxidation behavior of Cr{sub 2}O{sub 3} and Al{sub 2}O{sub 3} forming alloys at high temperatures. These reactive elements have been found effective as minor alloying additions, as oxide dispersions in the alloy, as implanted ions in the alloy's surface, or as thin surface coatings. In general, one element which is effective when present in the alloy is also effective when applied on the surface. However, there have been a number of exceptions. Our earlier work, which studied the effect of several reactive element oxide coatings on Ni-Cr and Co-Cr alloys indicated that while surface oxides of Ce, La, and Y were as effective as their alloying additions, coatings of ZrO{sub 2} and CaO had little effect, and the HfO{sub 2} coating even caused breakaway oxidation.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5902395
• Journal Information: Journal of the Electrochemical Society; (United States), Vol. 138:1; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
HAFNIUM OXIDES
OXIDATION
NICKEL ALLOYS
ALUMINIUM OXIDES
CHROMIUM OXIDES
CORROSION RESISTANCE
ELECTROCHEMISTRY
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM COMPOUNDS
HAFNIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion