TIME TEMPERATURE PARAMETERS AFFECTING CORROSION OF 18Cr-8Ni WELD METALS

Journal Article · Sun May 01 04:00:00 EDT 1960 · Welding J. (N.Y.)

OSTI ID:4189561

Moore, T J

Boiling nitric acid corrosion tests were conducted on als which were deposited using covered electrodes. Allweldmetal specimens were aged at 800 to 1500 deg F for 0.1 to 10,000 hr prior to corrosion testing. It was found that the time-temperature-corrosion rate relationship follows a definite pattern which can be presented in the form of a three-dimensional drawing, or as a " contour map" timetemperatare-sensitization diagram. Long times at low temperatures (800 to 1100 deg F) were found to sensitize the weld metals to a marked degree, much more severely than conventional sensitizing heat treatments of 1200 deg F for 1 or 2 hr. Tbe corrosion rate was found to decrease with decreasing carbon content, although even the 0.026% carbon weld metal exhibited severe sensitization after low temperature (800 to 1100 deg F) aging. A stabillzing heat treatment of 1200 deg F for 12 hr prior to 1000 deg F aging showed promise in maintaining acceptable corrosion resistance for the 0.056% carbon weld metal. However, stabilizing heat treatments prior to 800 to 900 deg F aging did not appear to be effective in reducing the excessive corrosion rates after long-time aging periods. (auth)

• Research Organization: Arcos Corp., Philadelphia
• NSA Number: NSA-14-014033
• OSTI ID: 4189561
• Journal Information: Welding J. (N.Y.), Journal Name: Welding J. (N.Y.) Vol. Vol: 39
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BOILING
CARBON
CHROMIUM ALLOYS
CORROSION
EFFICIENCY
ELECTRODEPOSITION
HEAT TREATMENTS
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL ALLOYS
NITRIC ACID
QUANTITY RATIO
STABILITY
WELDS