An Electrochemical Study on the Role of Dissolved Oxygen in the IGSCC of Sensitized Type 304 Stainless Steel in Dilute Na<sub>2</sub>SO<sub>4</sub>Solution at 285 C

Fujiwara, Keiko; Tomari, Haruo; Shimogori, Kazutoshi; Fukuzuka, Toshio

doi:10.5006/1.3577328

Cited by 8 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[18][19][20] According to the results of those studies, oxide film formed on stainless steel in hightemperature water has a double-layer structure. In particular, the inner layer, which is composed mainly of chromium-rich spinel oxide, is thought to play an important role in corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

Terachi¹,

Fujii²,

Arioka³

2005

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

Recent studies on stress corrosion cracking (SCC) behaviors of austenitic stainless steels in hydrogenated hightemperature water show that low potential SCC (LPSCC) can occur on cold-worked SUS 316 stainless steel (hereinafter, 316SS). In this study, oxide films and crack tips on cold-worked 316SS exposed to hydrogenated high-temperature water were characterized using analytical transmission electron microscopy (ATEM), grazing incidence X-ray diffraction (GIXRD) and Auger electron spectroscopy (AES) in order to study the corrosion and SCC behaviors of these films and crack tips. A double layer structure was identified for the oxide film after a constant extension rate tensile (CERT) test. The outer layer was composed of large particles (0.2-3 mm) of Fe 3 O 4 and the inner layer consisted mainly of fine particles ($10 nm) of FeCr 2 O 4 . In addition, nickel enrichment was identified at the metal/oxide interface. Particles of Fe 3 O 4 were also identified on the crack walls. These results indicate that the same electrochemical reactions had occurred inside and outside the crack. The crack tip area was filled with corrosion products of a chromium-rich oxide. In addition, nickel enrichment was observed at the crack tip. The formation of the nickel-enriched phase indicates that a selective dissolution reaction of iron and chromium occurred at the front of the LPSCC crack.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

Terachi¹,

Fujii²,

Arioka³

2005

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…o16 The stability of the oxide films on stainless steels and their ability to undergo breakdown and repassivation has been recognized as one of the most important factors in the nucleation and propagation of stress corrosion cracks in type 304 SS in high-temperature water where cracking has been attributed to a mechanism based on film rupture and localized anodic dissolution."'" However, relatively few data are available pertaining to a correlation of SCC behavior of 304 SS with the composition and structure of the oxide film present, e •' [8][9][10][11][12][13][14][15][16][17][18][19][20][21] or to comparisons of susceptibility assessed by different test procedures.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of U-bend and Slow Strain Rate Procedures for Assessing the SCC Resistance of Type 304 Stainless Steel in High-Temperature Water

et al. 1991

View full text Add to dashboard Cite

The effects of temperature, chloride content, and dissolved oxygen content on the susceptibility to stress corrosion cracking (SCC) of type 304 stainless steel in high-temperature water have been investigated. Both U-bend and slow strain rate stress corrosion tests were performed, complemented by electrochemical polarization curve measurements and extensive oxide film analyses by Auger electron spectroscopy (AES). The U-bend data showed decreasing susceptibility to cracking with increasing temperature, which correlated with thicker oxide films and greater enrichment of chromium in the films. In contrast, the slow strain rate tests (SSRTs) indicated maximum susceptibility to cracking at 250°C in the temperature range 200 to 300°C and the susceptibility to cracking increased with increasing oxide thickness. The extent of chromium and nickel enhancement in the oxide layers were different for the two specimen types tested in equivalent environments. Greater enhancement of nickel occurred in films formed on SSRT specimens than on U-bend specimens. It is concluded that the choice of test procedure for acquiring accelerated test data may be influenced by whether the components to which the data will be applied are likely to experience plastic strain during use.

show abstract

Bezugselektroden für Korrosionsuntersuchungen bei höheren Temperaturen und Drücken

Baucke

Wagner

1991

Materialwissenschaft Werkst

View full text Add to dashboard Cite

An Electrochemical Study on the Role of Dissolved Oxygen in the IGSCC of Sensitized Type 304 Stainless Steel in Dilute Na₂SO₄Solution at 285 C

Cited by 8 publications

References 0 publications

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

A Comparison of U-bend and Slow Strain Rate Procedures for Assessing the SCC Resistance of Type 304 Stainless Steel in High-Temperature Water

Bezugselektroden für Korrosionsuntersuchungen bei höheren Temperaturen und Drücken

Contact Info

Product

Resources

About

An Electrochemical Study on the Role of Dissolved Oxygen in the IGSCC of Sensitized Type 304 Stainless Steel in Dilute Na2SO4Solution at 285 C

Cited by 8 publications

References 0 publications

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

Microstructural Characterization of SCC Crack Tip and Oxide Film for SUS 316 Stainless Steel in Simulated PWR Primary Water at 320.DEG.C.

A Comparison of U-bend and Slow Strain Rate Procedures for Assessing the SCC Resistance of Type 304 Stainless Steel in High-Temperature Water

Bezugselektroden für Korrosionsuntersuchungen bei höheren Temperaturen und Drücken

Contact Info

Product

Resources

About

An Electrochemical Study on the Role of Dissolved Oxygen in the IGSCC of Sensitized Type 304 Stainless Steel in Dilute Na₂SO₄Solution at 285 C