Abstract
To improve the anticorrosion resistance of chromium-free Zn-Al sintered coating, characteristics of chromate on zinc-aluminum-chromium were studied by electrochemical methods. Depth profiles of elements were obtained by glow discharge spectrum (GDS) and X-ray photoelectron spectroscopy (XPS) was used to analyse the chemical states of main elements in Zn-Al coatings. Corrosion behaviors of steel samples coated with chromium-free Zn-Al and zinc-aluminum-chromium exposed to seawater were investigated by using electrochemical impedance spectroscopy (EIS) measurement. Both in open circuit potential and EIS monitoring self-healing phenomena of chromate were obviously observed. The self-healing function endows zinc-aluminum-chromium coating with better anticorrosion performance. Electrochemical analysis show that self-healing action of coatings is missing when replace chromate with molybdate and silane.
| Original language | English |
|---|---|
| Pages (from-to) | 5847-5852 |
| Number of pages | 6 |
| Journal | Surface and Coatings Technology |
| Volume | 202 |
| Issue number | 24 |
| DOIs | |
| State | Published - 15 Aug 2008 |
Keywords
- Chromium-free
- Corrosion
- Electrochemical impedance spectroscopy
- X-ray photoelectron spectroscopy
- Zinc-aluminum-chromium coating
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