Environmental Effects on the Susceptibility and Crack Growth of near Neutral PH Stress Corrosion Cracking
Bibliographic record
Abstract
Abstract The environmental effects on the susceptibility and crack growth of near-neutral pH stress corrosion cracking (SCC) were characterized using mechanical testing, hydrogen permeation and potential drop measurements. The investigated environmental parameters were dissolved CO2, HCO3−, pH, sulfate and chloride, sulfide and organics (9,10-anthraquinone-2,6-disulfonate (AQDS), Laurentian humic acid (LHA) and Laurentian fulvic acid (LFA)). Sufficient hydrogen concentration was critical for the susceptibility of near-neutral pH SCC. Hydrogen concentration was directly proportional to the concentration of sulfide (HS−), and the %RA-ratio decreased linearly with the logarithm of sulfide concentration. Organic compounds, like AQDS, LHA and LFA, had an inhibitive effect on the crack growth rates, and also reduced the hydrogen concentration. Higher CO2 concentrations led to a decrease in solution pH. However the addition of HCO3−, may result in the formation of a ferrous carbonate film that could protect the underlying steel and slow the corrosion process.
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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 | 0.001 |
| 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 | 0.000 | 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".