Surface passivation of nickel-chromium alloys at room temperature

Technical Report · Fri Apr 01 04:00:00 EST 1988

OSTI ID:5658705

Jeng, Shin-Puu

The surface composition and room temperature oxidation of atomically clean single crystal Ni-15%Cr(110) and polycrystalline Ni-23%Cr alloy have been studied using Auger Electron Spectroscopy (AES), X-ray Photoelectron Spectroscopy (XPS), Ion Scattering Spectroscopy (ISS) and Electron Stimulated Ion Desorption (ESID). It was found that Ni segregated preferentially to the surface of Ni-15%Cr(110) in vacuum at temperatures between 500 to 650{degree}C, and the heat segregation was 2550 cal/mole. The surface region of the Ni-Cr alloy was depleted in Ni during Ar ion bombardment at temperatures above 200{degree}C, which is an agreement with the model of preferential sputtering of Ni caused by radiation-enhanced surface segregation of Ni. But the subsurface region of room temperature sputtered Ni-Cr alloy was depleted in Cr. Possible causes for this observation were discussed.

• Research Organization: Florida Univ., Gainesville, FL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG05-84ER45155
• OSTI ID: 5658705
• Report Number(s): DOE/ER/45155-T1; ON: DE89017815
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
ALLOYS
AUGER ELECTRON SPECTROSCOPY
BINDING ENERGY
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ION SPECTROSCOPY
NICKEL ALLOYS
NICKEL BASE ALLOYS
NICKEL COMPOUNDS
NONMETALS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PASSIVATION
SEGREGATION
SORPTION
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS