Effect of Copper(II) Ions on Corrosion Resistance of Al-Zn Coated 5052 Aluminum Alloy in Seawater
Bibliographic record
Abstract
The corrosion resistance of the composite anti-corrosion coating formed by an aluminum-zinc coating and epoxy sealer on the surface of an open rack vaporizer (ORV) in seawater was investigated at different copper ion (Cu 2+ ) concentrations. The surface microstructure of the coating was characterized by ultra-field 3D observation, SEM and energy spectrum analysis (EDS). The sealer was found to be effective in shielding the coating surface and significantly reduced the corrosion rate of the coating. A dissolution process of the passive film on the coating surface is evident from the potentiodynamic polarization curves and surface morphology. Local corrosion occurs on the coating surface, and the number and area of surface corrosion pits increase with the concentration of copper in solution, indicating a decrease of the corrosion resistance of the coating. Weight loss of the samples increases from 4.5 mg to 5.4 mg after a 32 days immersion, and the damage of copper ions on the coating originates from weak positions of the surface. The electrochemical corrosion behavior of the coating was investigated by dynamic potential polarization and electrochemical impedance spectroscopy (EIS), with a positive effect found after a short immersion period in a solution with copper ion concentration lower than 5 ug/L, with this effect not evident at higher copper concentrations.
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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 | 0.001 |
| 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 | 0.001 | 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".