Raman spectral and electrochemical studies of surface film formation on iron and its alloys with carbon in Na2CO3/NaHCO3 solution with reference to stress corrosion cracking

1994 ◽  
Vol 39 (14) ◽  
pp. 2225-2236 ◽  
Author(s):  
M. Odziemkowski ◽  
J. Flis ◽  
D.E. Irish
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Film Formation ◽  
Surface Film ◽  
Corrosion Cracking ◽  
Electrochemical Studies ◽  
Raman Spectral ◽  
Spectral And Electrochemical Studies

scholarly journals Correlation between electrochemical properties and stress corrosion cracking of super 13Cr under an HTHP CO2 environment

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24679-24689 ◽  
Author(s):  
Xiaoqi Yue ◽  
Mifeng Zhao ◽  
Lei Zhang ◽  
Huijuan Zhang ◽  
Dapeng Li ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pitting Corrosion ◽  
Surface Film ◽  
Corrosion Cracking ◽  
Co2 Environment

The degradation of a surface film induces pitting corrosion, which further increases SCC susceptibility.

Effect of Anions on the Fluoride Corrosion of Titanium-Grade 7

2002 ◽  
Vol 757 ◽  
Author(s):  
A. L. Pulvirenti ◽  
K. M. Needham ◽  
M. A. Adel-Hadadi ◽  
D. S. Wong ◽  
A. Barkatt ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Fluoride Ion ◽  
Electrochemical Studies ◽  
Effective Inhibitor ◽  
Passive Region ◽  
Severe Attack ◽  
Chloride Sulfate ◽  
Titanium Grade

ABSTRACTThe effects of chloride, sulfate, and nitrate on the fluoride ion local attack of Ti-Grade 7 (Ti-7: UNS R52400) were investigated. It was observed that a chloride: fluoride ratio of as high as 10 : 1 by mole was necessary to produce visible severe attack in immersion tests. Localized attack on Ti-7 was most severe at approximately 120°C, and at neutral pH. However, electrochemical studies detected that a narrowing of the passive region can occur at chloride: fluoride ratios as small as 1.1 : 1 by mole. The addition of sulfate did not significantly inhibit pitting or stress corrosion cracking of Ti-7 U-bends. However, the addition of nitrate is suspected to act as an effective inhibitor.

Influence of Surface Films on the Susceptibility of Inconel 600 to Stress Corrosion Cracking

2004 ◽  
Vol 261-263 ◽  
pp. 875-884 ◽  
Author(s):  
Todd S. Mintz ◽  
Thomas M. Devine
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Surface Film ◽  
Surface Enhanced Raman Spectroscopy ◽  
Corrosion Cracking ◽  
Surface Films ◽  
Pressurized Water ◽  
Inconel 600 ◽  
Primary Water

The susceptibility of Inconel 600 to stress corrosion cracking (SCC) in the primary water of a pressurized water reactor (PWR) is strongly dependent on potential. In the present paper we assess the validity of the hypothesis that the potential dependency of SCC is related to the influence of potential on the identities of the surface films that form on Inconel 600. That is, according to the hypothesis, SCC requires the presence of a particular surface film. The identities of the surface films that develop at different potentials on Inconel 600 in PWR primary water (2 ppm LiOH + 1200 ppm H3BO3) at 288°C were investigated in situ by surface enhanced Raman spectroscopy (SERS). To help identify the components of the films that grow on Inconel 600, the films that form on unalloyed nickel, chromium, and iron in 288°C PWR primary water were also investigated. The main results of the in situ SERS investigation of the surface films are as follows. (1) No films were formed on Inconel 600 at potentials below the region of potential in which SCC occurs. (2) A chromium-rich M3O4 oxide forms on Inconel 600 in the SCC region. (3) NiO forms as the potential is increased immediately above the region of SCC susceptibility. (4) At still higher potentials, films of (Fe,Cr)2O3 and Ni3-xFexO4 form. The results are consistent with concept that specific films affect SCC susceptibility.

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