Corrosion of AISI 316 and AISI 304 stainless steel with iodine vapor
The weight loss of stainless steel in corrosion with iodine vapor was studied at 500 to 1000 deg C and an iodine vapor pressure range of 0.05 to 0.5 mm Hg, using a thermobalance. In the initial stage of corrosion, the weight loss rate is largely influenced by solution treatment or surface treatment; the induction period, observed for solution-treated samples, is shortened or eliminated by fission-fragment irradiation, ion-bombardment or mechanical polishing, and in some cases corrosion is even accelerated by the surface treatments. A constant weight loss region follows the initial stage of corrosion. In this region, the weight loss rate is not dependent on treatment to the samples, and has a linear relationship with the vapor pressure of iodine. The rate is the largest at about 800 and 750 deg C for AISI 316 s. s. and AISI 304 s. s. The rates in general are larger for AISI 304 s. s. than for AISI 316 s. s. below 700 deg C but almost the same above 800 deg C. Corrosion product layer is observed on the surface of the sample below 700 deg C. Based on these findings, the corrosion process is discussed. The deposition of corrosion product in a temperature gradient tube is also described.
- Research Organization:
- Japan Atomic Energy Research Inst., Tokyo (Japan)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7039340
- Report Number(s):
- ORNL-tr--4694; JAERI-M--5946
- Country of Publication:
- Japan
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION PRODUCTS
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELEMENTS
FLUIDS
GASES
HALOGENS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IODINE
IRON ALLOYS
IRON BASE ALLOYS
LOSSES
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
STAINLESS STEEL-304
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TEMPERATURE DEPENDENCE
VAPORS
VERY HIGH TEMPERATURE
WEIGHT