Electrochemical Aspects of Stress Corrosion Cracking of Ni-Cr-Fe Alloys in Acid Sulfate Solutions Relevant to Nuclear Steam Generators
Bibliographic record
Abstract
Alloy 600 and Alloy 800 are Ni-Fe-Cr alloys used in nuclear steam generators. Sulfate is an impurity found in faulted secondary side water that can accumulate in crevices in the acidic-to-neutral pH range, possibly resulting in acid sulfate stress corrosion cracking. Electrochemical measurements were done on Alloys 600 and 800 exposed to acid sulfate solutions at 315 °C and 120 bar. Results indicate that the addition of sulfate significantly increased the corrosion rate of both alloys – possibly due to reduction of sulfate resulting in impairment of surface passivity by reduced sulfur species. The addition of Fe 2+ in solution reduced the corrosion rate due to the formation of a magnetite film. The corrosion rate and anodic current density of the 800 alloy were greater than those of the 600 alloy at high sulfate concentrations but became comparable at lower concentrations, or with the addition of Fe 2+ . SCC experiments were done and were in broad agreement with electrochemical measurements.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".