A Polarization Study of Alloy 625, Nickel, Chromium, and Molybdenum in Ammoniated Sulfate Solutions
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Bibliographic record
Abstract
A polarization study of Alloy 625 (UNS N06625), nickel, chromium, and molybdenum, in a solution of ammonia (NH3) and sulfuric acid (H2SO4) at pH 10, is presented. The effect of air, oxygen, hydrogen peroxide (H2O2), and variation in pH is examined. Pourbaix diagrams for the Ni-NH3-H2O and Cr-H2O systems are presented. The formation of metastable oxides is suggested by the observed passivation of both the alloy and Ni outside their thermodynamic fields of stability. The alloy’s polarization curves are similar to those obtained for Cr. Ni is seen to have the highest passive current density while Mo does not passivate. Selective dissolution of Ni from the surface regions of the alloy is predicted. Corrosion rates, which are low (1.2 × 10−3 mmpy at pH 10), increase with decreasing pH. Passive current densities are found to be higher in solutions of sulfate alone. Highly oxygenated solutions do not result in an increase in corrosion rate. However, the addition of H2O2 to the ammoniated solution results in the alloy’s direct activation at transpassive potentials.
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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) | 0.000 | 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