Sulfur in the Corrosion of Superalloys.

reportActive / Technical Report | Accession Number: ADA107867 | Open PDF

Abstract:

This study was divided into three interrelated sections. These were 1 corrosion of nickel in SO2-O2-Ar gas mixtures at 800C 2 defect structure of calcia- and of yttria-stabilized zirconia and 3 diffusion of radio-tracer sulfur-35 and of tellurium 127m in calcia-stabilized zirconia. The corrosion study resulted in a confirmation of linear kinetics for corrosion of nickel in SO2-Argon gas mixtures at 800C and an agreement of a self-consistent mechanism involving the migration of SO2 as a gas molecule through the outer NiO layer and dissociation at the inner sulfide layer as a rate determining step. The corrosion kinetics in 20O2-variable SO2-balance argon and in 30 SO2 variable O2-balance argon were extremely rapid. These data did not show that interconnected stringers of sulfide through the outer NiO layer was responsible for the observed kinetics.

Author(s):
Wagner, J. Bruce, Jr
Author Organization(s):
ARIZONA STATE UNIV TEMPE CENTER FOR SOLID STATE SCIENCE
Descriptive Note:
Final rept. 10 Dec 77-15 Jul 81,
Supplementary Note:
Sponsored in part by Grant DAAG29-78-G-0060. DOI: 10.21236/ADA107867
Pagination:
0039

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARO-14925.2-MS
Contract/Grant Number(s):
DAAG29-80-C-0049, DAAG29-78-G-0032
Monitor Series:
14925.2-MS
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_1_Force Support; JCA_5_Command and Control; JCA_1.2.7_Experimentation; JCA_5.3_Planning; JCA_1.2_Force Preparation; JCA_JCA_4.1.2_Sustain the Force; JCA_4.1_Deployment and Distribution
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*CORROSION INHIBITION, *NICKEL ALLOYS, *SULFIDES, *SUPERALLOYS, REACTION KINETICS, HIGH TEMPERATURE, IMPURITIES, OXYGEN, DEFECTS(MATERIALS), DIFFUSION
Field(s)/Group(s):
Physical Chemistry, Properties of Metals and Alloys, Fabrication Metallurgy
Report Date:
1981 Nov 06