Barrier Properties of Two Pipeline Coatings
Bibliographic record
Abstract
Abstract Two coating systems were examined based on fundamental principles for their barrier properties in relation to corrosion under a blistered coating and under a crevice coating – a delaminated coating with a holiday. In a blister or in a crevice but away from the holiday, where cathodic protection (CP) could be ineffective, the corrosion rate could be determined by the coating barrier properties and increases as the coating deteriorates. It was found that in a crevice the pipeline surface could be better protected if the soil is more conductive because then CP can penetrate deeper into the crevice. For more resistive soils, a higher CP potential is needed in order for protecting the disbonded area away from the holiday. This may however require higher cost and result in perhaps hydrogen induced cracking (HIC), a brittle failure of the pipelines due to atomic hydrogen ingression into the metal substrate. When the coating adhesion is lost, good barrier properties for a blistered coating and good barrier properties and an effective CP for a crevice coating are the ways to provide control of the pipeline corrosion.
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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 | 0.001 | 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".