Dissolution Kinetics of Pure Zinc: The Effect of Bulk Solution Concentration and Temperature Studied by the Lead-In Pencil Electrode Technique
Bibliographic record
Abstract
The lead-in pencil electrode technique was employed to study the dissolution kinetics of pure zinc in 0.01 M to 1.0 M perchlorate solution from 20–50°C. The limiting current density (ilim) during diffusion controlled dissolution and the transition potential (ET) between diffusion controlled and activation/ohmic controlled dissolution were measured. It was found that both ilim and ET decrease with decreasing bulk solution concentration, while the degree of supersaturation required for salt precipitation remained nearly constant. Increasing temperature increased the ilim and ET, whereas, the degree of supersaturation decreased with temperature. A model for anodic dissolution kinetics within the pit was used to interpret the effect of bulk solution concentration and temperature on ET. It was shown that for a constant temperature, resistance overpotential inside the pit governs the dissolution kinetics at various perchlorate concentrations, while the contribution of the corrosion potential for saturated pit solution and the IR drop within the pit determine the overall ET value at different temperatures.
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How this classification was reachedexpand
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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".