Physical and Electrochemical Evidence for the Role of a Mg Hydride Species in Mg Alloy Corrosion
Bibliographic record
Abstract
The role of MgH2 in the process of filiform-like corrosion on Mg alloys has been investigated. MgH2 was grown galvanostatically on the Mg ZEK100 alloy at a current density of −5 mA/cm2 for various times in 0.1 M NaOH and the subsequent electrochemical and corrosion behavior compared to that of as-polished specimens. Polarization curves demonstrated cathodic activity under anodic polarization (i.e., the “negative difference effect”) while x-ray diffraction confirmed the presence of MgH2. Dynamic secondary ion mass spectrometry measurements show strong evidence for the presence of MgH2 in aged sections of corrosion filaments, in the leading edge of corrosion filaments, and in the Mg matrix ahead of the leading edge of corrosion filaments in alloys corroded at Ecorr. The presence of these hydrides is linked to the filiform-like corrosion morphology observed on Mg alloys via in situ monitoring. These hydrides are responsible for the filiform-like corrosion by acting as temporary metastable catalysts for hydrogen evolution prior to their decomposition to Mg(OH)2.
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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 | 0.000 |
| 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) | 0.001 | 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 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".