Thermodynamic Model for High-Temperature Corrosion Applications: The (NaCl + Na<sub>2</sub>CO<sub>3</sub> + Na<sub>2</sub>SO<sub>4</sub> + Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub> + Na<sub>2</sub>CrO<sub>4</sub> + Na<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> + Na<sub>2</sub>MoO<sub>4</sub> + Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> + Na<sub>2</sub>O + KCl + K<sub>2</sub>CO<sub>3</sub> + K<sub>2</sub>SO<sub>4</sub> + K<sub>2</sub>S<sub>2</sub>O<sub>7</sub> + K<sub>2</sub>CrO<sub>4</sub> + K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> + K<sub>2</sub>MoO<sub>4</sub> + K<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> + K<sub>2</sub>O) System
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide A thermodynamic model has been developed for the condensed phases of the salt system (NaCl + Na 2 CO 3 + Na 2 SO 4 + Na 2 S 2 O 7 + Na 2 CrO 4 + Na 2 Cr 2 O 7 + Na 2 MoO 4 + Na 2 Mo 2 O 7 + Na 2 O + KCl + K 2 CO 3 + K 2 SO 4 + K 2 S 2 O 7 + K 2 CrO 4 + K 2 Cr 2 O 7 + K 2 MoO 4 + K 2 Mo 2 O 7 + K 2 O) (diluted in free oxides), which is most often involved in combustion processes for energy production. This model is relevant in particular for the solid deposits formed in steel and stainless steel installations containing Ni, Cr, Mo, W, and V as alloying elements and permits the accurate prediction of thermodynamic properties and phase equilibria in the multicomponent system. The (NaCl + Na 2 CO 3 + Na 2 SO 4 + Na 2 S 2 O 7 + Na 2 CrO 4 + Na 2 Cr 2 O 7 + Na 2 O + KCl + K 2 CO 3 + K 2 SO 4 + K 2 S 2 O 7 + K 2 CrO 4 + K 2 Cr 2 O 7 + K 2 O) subsystem was critically evaluated in previous papers. In the present work, Na 2 MoO 4, K 2 MoO 4, Na 2 Mo 2 O 7, and K 2 Mo 2 O 7 have been added to the previously developed thermodynamic model. The available phase diagram and thermodynamic data have been critically evaluated, and model parameters have been obtained. The Modified Quasichemical Model in the Quadruplet Approximation was used for both the liquid solution and the high-temperature hexagonal solid solution (Na 2 CO 3 + Na 2 SO 4 + Na 2 CrO 4 + Na 2 MoO 4 + K 2 CO 3 + K 2 SO 4 + K 2 CrO 4 + [K 2 MoO 4 ]), whereas the Compound Energy Formalism (CEF) was used for all other solid solutions. Due to the lack of data, several common-ion binary subsystems have been investigated in this work at different compositions by differential scanning calorimetry-thermogravimetric analysis (DSC-TGA). In addition, the nonstoichiometric molybdenum-glaserite phase has been studied at the composition (35 mol % Na 2 MoO 4 + 65 mol % K 2 MoO 4 ) using scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDS) and DSC-TGA, after annealing at 400 °C for 4 weeks.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".