Electrochemical Behaviors of Quad-Layer Aluminum Brazing Sheet Composite for Automotive Applications
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Bibliographic record
Abstract
The cross-sectional depth corrosion potential profiles for a quad-layer aluminum brazing sheet composite AA4045/ 7072/3003/4045 (UNS A94045/A97072/A93003/A94045) in both the pre- and post-brazed forms have been established using ASTM G69-97 standard test method. Galvanic corrosion behaviors between the AA7072 (UNS A97072) layer and the nonzinc-containing AA3003 core alloy and AA4045 clad alloy also have been investigated in ASTM G69-97 solution by galvanic current measurement method. The effect of zinc and other major alloying elements on the corrosion potential was analyzed. The electrochemical studies show that there are significant potential differences (≥100 mV) and galvanic currents (~2 to 8 × 102 μA/cm2) between the AA7072 layer and the other nonzinc-containing core and clad layers both before and after brazing. A zinc-containing AA7072 layer appears to be able to provide a sacrificial protection to both core alloy AA3003 and high-silicon braze clad layers such as AA4045 in ASTM G69-97 solution. The zinc distribution across the brazing sheet material was derived from the relative corrosion potential measurements. The distribution of zinc within the material can be related to the diffusion of zinc during the brazing process.
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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