The use of x-ray techniques in the in situ study of corrosion

Conference · Thu Dec 31 04:00:00 EST 1992

OSTI ID:10180857

Isaacs, H S

Applications of x-ray absorption and fluorescence techniques for in situ chemistry studies of passivity and localized corrosion have been described. X-ray absorption near edge structures showed that rapidly grown oxides on aluminum-chromium alloys incorporated chromium in the oxide. Repeated electrochemically induced changes between the chromium 3- and 6-valent state occurred without chromium dissolving. When the oxide was grown by small potential steps, the chromium dissolved when 6-valent chromate was formed. With iron-chromium alloys, dissolution of chromate took place but 6-valent chromium was also incorporated in the oxide. The 6-valent state was reduced on exposing the iron alloy to air. X-ray fluorescence measurements, in conjunction with energy dispersive analysis, have been used to monitor iron, chromium and nickel concentrations in solution. The concentrations and concentration gradients during localized corrosion of stainless steel were used to determine salt solubility and relative diffusion rates.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10180857
• Report Number(s): BNL--49361; CONF-921277--2; ON: DE93019845
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105
ALUMINIUM ALLOYS
CHROMATES
CHROMIUM
CHROMIUM ALLOYS
CORROSION AND EROSION
ELECTROCHEMICAL CORROSION
IRON
IRON ALLOYS
NICKEL
PASSIVATION
STAINLESS STEELS
USES
X-RAY FLUORESCENCE ANALYSIS