Accession Number : AD0700948

Title :   ROLE OF RARE EARTH ADDITIONS IN THE PHENOMENON OF HOT CORROSION.

Descriptive Note : Final rept. 1 Feb 68-31 Jan 70,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Seybolt,Alan U.

Report Date : DEC 1969

Pagination or Media Count : 27

Abstract : The severity of attack in the hot corrosion of nickel-base superalloys is greatly reduced in alloys containing a dispersoid of CeO2 or La2O3. These oxides interact with the sulfur entering the alloy from Na2SO4 decomposition, by forming an oxysulfide of the type M2O2S. In this way less Ni3S2 is formed, and hence less catastrophic oxidation. (Author)

Descriptors :   (*NICKEL ALLOYS, *CORROSION INHIBITION), HEAT RESISTANT ALLOYS, HEAT RESISTANT METALS, ADDITIVES, OXIDES, CERIUM COMPOUNDS, LANTHANUM COMPOUNDS, CORROSION RESISTANCE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE