Abstract
A novel nanocrystalline zinc electroplating technology in a sulfate bath was investigated so as to overcome the poor corrosion resistance of zinc coatings that exist in the tradtional high speed zinc plating technology for wire rod. The surface morphology and grain size of the coating were studied by field emission scanning electron microscope, transmission electron microscopy and X-ray diffraction. The corrosion resistance and ductility of nanocrystalline zinc coating were also evaluated by potentiodynamic polarization curve and wire winding tests, respectively. The nanocrystalline zinc coating can not been obtained if we just change the pulse current conditions in basic sulfate bath (zinc sulfate 100 g/L, boric acid 20 g/L when pH value of the solution is 1~2). But the zinc coating that is performed under optimal pulse reverse current conditions is uniform, fine and bright with an average grain size of 31 nm in the basic sulfate bath with grain refiner additive 1 g/L. This nanocrystalline zinc coating exhibits good reproducibility and ductility properties on mild steel sheets and mild steel wires, as well as better corrosion resistance than conventional coarse-grained zinc coating.
| Original language | English |
|---|---|
| Pages (from-to) | 23-29 |
| Number of pages | 7 |
| Journal | Cailiao Kexue yu Gongyi/Material Science and Technology |
| Volume | 23 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Aug 2015 |
| Externally published | Yes |
Keywords
- Continuous electroplating
- Nanocrystalline
- Pulse electroplating
- Wire rods
- Zinc electroplating
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