Sensitivity of the passive films on <scp>API</scp>‐<scp>X</scp>100 steel heat‐affected zones (<scp>HAZ</scp>s) towards trace chloride concentrations in bicarbonate solutions at high temperature
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Bibliographic record
Abstract
This paper investigates the stability and growth of the passive films on the heat‐affected zones (HAZs), of API‐X100 pipeline steel, in dilute bicarbonate solutions containing 100 and 300 ppm chloride ions at 363 K. The investigations were carried out by electrochemical methods, and the kinetics and corrosion rates were evaluated. The HAZs were simulated by thermal Gleeble cycles of heating up to 1223 K peak temperature, followed by cooling at 10, 30, and 60 K/s. The 30 and 60 K/s HAZs showed evidence of thin, highly sensitive passive films towards the increased chloride concentration, and evidence of increased charge‐transfer resistance over immersion time at the OCP conditions. The corrosion rates of the 30 K/s HAZs, of which acicular ferrite is the main constituent, were the lowest, among other samples, as revealed by the slow 0.05 mV/s potentiodynamic polarization and EIS. The passive films of the 10 K/s HAZ, at the open circuit potentials, were of the highest resistance to deteriorate/facilitate for mass transport.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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 it