Corrosion Characteristics of Mild Steel in Urea Ammonium Nitrate Fertilizer Solutions
Why this work is in the frame
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Bibliographic record
Abstract
Anodic polarization studies have been conducted on mild steel in urea ammonium nitrate (UAN) fertilizer solutions comprising 31 wt% urea ([NH2]2CO), 39 wt% ammonium nitrate (NH4NO3), and 30 wt% H2O, with a total N content of 28 wt% (UAN 28-0-0). It was determined that mild steel can spontaneously exhibit either active-passive or passive behavior when immersed in UAN solutions. At 23°C, specimens exhibiting active-passive behavior experienced corrosion rates of ~2 mm/y for pH values in the range of 3 to 8.5. At pH values <3, the corrosion rate increased rapidly, reaching a value of 92 mm/y at a pH of 1.1. Specimens exhibiting passive behavior experienced corrosion rates of ~0.002 mm/y for the pH range of 6 to 8.5. An increase in temperature from 23°C to 60°C increased the corrosion rate of specimens exhibiting active-passive behavior from ~2 mm/y to ~15 mm/y. To minimize corrosion, mild steel storage tanks for liquid UAN fertilizer should be kept free of sludges and other contaminants, which could provide stagnant areas where low pH areas can develop. Further, storage tanks should be painted a light color since darkly painted tanks experience higher temperatures and thus higher corrosion rates.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 it