Environmental Aspects of SCC of High Alloys in Sour Environments

Miyasaka, Akihiro; Denpo, K.; Ogawa, Hiroyuki

doi:10.5006/1.3585033

Cited by 14 publications

(23 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these regions, the alloy could not repassivate and mechanical stress was elevated. [61][62][63] Intergranular cracks found at the bottom of the pits also could act as seeds of SCC. 43 No nickel salts were found in corrosion products inside the cracks.…”

Section: Corrosion Engineering Sectionmentioning

confidence: 99%

Corrosion of Alloy 625 in Aqueous Solutions Containing Chloride and Oxygen

Kritzer¹,

Boukis²,

Dinjus³

1998

CORROSION

View full text Add to dashboard Cite

Alloy 625 (UNS N06625) is used frequently as a reactor material for the oxidation of hazardous organic wastes in supercritical water (supercritical water oxidation [SCWO]). In the presence of chloride (Cl -) and oxygen (O 2 ), all Ni-based alloys corrode fast in high-temperature, subcritical water. High-pressure, high-temperature-resistant tube reactors made of alloy 625 were used as specimens. Coupons were exposed simultaneously inside the test tubes. Experimental conditions included temperatures up to 500°C and pressures up to 38 MPa. Pitting corrosion was observed at temperatures above ≈ 130°C to 215°C. At higher temperatures (up to the critical temperature of water), transpassive dissolution dominated. Under certain conditions, transgranular stress corrosion cracking (TGSCC) appeared in the transition zone between the passive and transpassive regions leading to premature failure of the test reactors. Parts of the corrosion products were insoluble in supercritical water and formed thick layers in the supercritical part of the reactor. Underneath these layers, very little intergranular corrosion (IGC) occurred. In neutral or alkaline solutions and in deaerated hydrochloric acid (HCl), corrosion rates of transpassive dissolution decreased drastically.

show abstract

Section: Corrosion Engineering Sectionmentioning

confidence: 99%

Corrosion of Alloy 625 in Aqueous Solutions Containing Chloride and Oxygen

Kritzer¹,

Boukis²,

Dinjus³

1998

CORROSION

View full text Add to dashboard Cite

show abstract

“…Considering that SCC in sour environments initiates at pits, the two boundaries were expected to coincide with each other after a sufficiently long time. 7,15 By substituting transition A (no attack-to-pitting) for transition C (no SCC-to-SCC), transition C also could be predicted by electrochemical techniques.…”

Section: Prediction Of Transition From No Scc To Sccmentioning

confidence: 99%

“…7 Then, the E 1 value of this reaction, and approximately E ip of passive alloys, can be calculated using Equation (10). 8 In Equation (10), the pH value can be obtained by the procedure introduced in the previous section, and H 2 S activity can be calculated thermodynamically as: 6 S + 2H + + 2e -= H 2 S (9)…”

Section: Redox Potential Of the Environmentsmentioning

confidence: 99%

Corrosion Performance and Application Limits of Corrosion-Resistant Alloys in Oilfield Service

Miyasaka

Ogawa

1995

CORROSION

Self Cite

View full text Add to dashboard Cite

The corrosion behavior of corrosion-resistant alloys (CRA) in sour environments was investigated using a duplex stainless steel as a representative CRA. Changes in corrosion morphologies resulting from changes in environmental aggressiveness were elucidated. The application limits of CRA were shown to be determined by whether pitting corrosion occurred. A theory was proposed for predicting the corrosion morphologies and, thus, determining the application limits of the CRA. The validity of prediction by this new theory was confirmed by good agreement with results from long-term immersion tests and a field test for actual-size test pipes. Since this theory was based on the corrosion mechanism, it showed many advantages: The prediction was accurate, the results for one environment could be extended to other environments, and the prediction was conducted very quickly.

show abstract

“…Cold worked seamless pipes can have yield strengths of more than 1100 MPa. [3,6,14,[33][34][35] The major limitation to the application of these duplex alloys appears to be their susceptibility to sulfide SCC, although they are resistant to chloride-induced SCC. [26,34,36] Nickel-based alloys are a family of alloys in which the principal constituent is nickel although it might be <50% of the total composition.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature high‐pressure SCC testing of corrosion‐resistant alloys

Galakhova

Mori

Prattes

2021

Materials & Corrosion

View full text Add to dashboard Cite

Stress corrosion cracking test methods of corrosion-resistant alloys are reviewed. The interest to write a review on this topic was drawn by demands for oil country tubular goods applicable in deep wells with high pressures, high temperatures, and the presence of H 2 S, where stress corrosion cracking is one of the most critical failure modes. All conventional methods for determining the stress corrosion cracking resistance of an alloy, mainly slow strain rate testing, constant load testing (tensile, 4-PB), constant strain testing (U-bend, C-ring), and fracture mechanics (double cantilever beam sample) are covered. Considering the variety of testing solutions, the field of search is narrowed to hot (up to 250°C) aqueous chloride solutions with dissolved H 2 S and CO 2 gases under high pressure (up to 200 bar total pressure).

show abstract

Environmental Aspects of SCC of High Alloys in Sour Environments

Cited by 14 publications

References 1 publication

Corrosion of Alloy 625 in Aqueous Solutions Containing Chloride and Oxygen

Corrosion of Alloy 625 in Aqueous Solutions Containing Chloride and Oxygen

Corrosion Performance and Application Limits of Corrosion-Resistant Alloys in Oilfield Service

High‐temperature high‐pressure SCC testing of corrosion‐resistant alloys

Contact Info

Product

Resources

About