Intergranular Corrosion Behavior of 00Cr12 Ferritic Stainless Steels Containing Cerium

2013 ◽  
Vol 690-693 ◽  
pp. 133-138
Author(s):  
Ya Bo Li ◽  
Fu Ming Wang ◽  
Xiao Nong Cheng
Keyword(s):  
Grain Boundary ◽  
Corrosion Behavior ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Optical Microscope ◽  
Mechanism Analysis ◽  
Chromium Depletion ◽  
Ferritic Stainless Steels ◽  
Boundary Density ◽  
Grain Sizes

Intergranular corrosion behavior of 00Cr12 ferritic stainless steels with different amounts cerium was evaluated. For this evaluation, electrochemical measurements - polarization curves - were obtained for tested materials, and optical microscope was used to observe corrosive microstructure. Experimental results shows: cerium reduces grain sizes and improves intergranular corrosion resistance of test materials. Through mechanism analysis: cerium reduces grain sizes, increases grain boundary density, therefore might improve distribution aspects of carbides and nitrides, chromium depletion situation near grain boundary would be improved, this work worth further study.

Prevention of Corrosion in Austenitic Stainless Steel through a Predictive Numerical Model Simulating Grain Boundary Chromium Depletion

2017 ◽  
pp. 374-389
Author(s):  
M.K. Samal
Keyword(s):  
Mathematical Model ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Numerical Model ◽  
Low Temperature ◽  
Grain Boundary ◽  
Stainless Steels ◽  
Predictive Models ◽  
Chromium Depletion ◽  
Sensitization Behavior

In this chapter, a mathematical model for rate of formation of chromium carbides near the grain boundary, which is a pre-cursor to chromium depletion and corresponding sensitization behavior in stainless steels, is presented. This model along with the diffusion equation for chromium in the grain has been used to obtain chromium depletion profiles at various time and temperature conditions. Finite difference method has been used to solve the above equations in the spherical co-ordinate system and the results of time-temperature-sensitization diagrams of four different types of alloys have been compared with those of experiment from literature. For the problem of low temperature sensitization and corresponding inter-granular corrosion in austenitic stainless steel, it is very difficult to carry out experiment at higher temperatures and justify its validity at lower operating temperatures by extrapolation. The development of predictive models is highly useful in order to design the structures for prevention of corrosion of the material in aggressive environments.

Intergranular Corrosion in Low Interstitial 40%Cr Ferritic Stainless Steels

1990 ◽  
Vol 25 (3) ◽  
pp. 191-196 ◽  
Author(s):  
M. A. A. Tullmin ◽  
M. J. Witcomb ◽  
M. B. Cortie ◽  
F. P. A. Robinson
Keyword(s):  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Ferritic Stainless Steels
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