Predicting Corrosion and Current Flow within a Disc Crevice on Coated Steels
Bibliographic record
Abstract
The objective of this work was to develop a model to describe pipeline corrosion within a disc-shaped crevice in the presence of oxygen (O2). The model results from modification of the pipeline crevice corrosion model (PCCM) previously developed for pipeline corrosion in a rectangular crevice. The present study compares corrosion rate distribution within the disc to the previous rectangular crevices, and investigates the effect of the geometrical parameters of the disc crevice on the corrosion rate. Compared to a rectangular crevice, for the same holiday potential, the corrosion rate decreases more rapidly from the holiday into the disc crevice. Similar to the rectangular crevice, as the holiday radius increases, O2 reaches the pipe surface in the crevice more readily and increases the crevice corrosion rate. Increasing the gap between the pipe surface and the coating or increasing the coating thickness decreases O2 diffusion to the pipe surface and decreases the crevice corrosion rate. External cathodic protection (CP) protects the pipe surface by cathodically reducing O2 near the holiday. Pipeline corrosion at higher temperatures has a higher corrosion rate but a lower corrosion potential. At a potential believed to be protective, high temperatures may render this protection ineffective.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.002 | 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".