| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5439973 | Corrosion Science | 2017 | 37 Pages |
Abstract
Beryllium was oxidized at a current density of 10Â mAÂ cmâ2 in a 0.5Â M Na2CO3 (pHÂ =Â 11.2) electrolyte to understand the micro-arc oxidation (MAO) process. Different oxidation stages were investigated by analysing the voltage-time responses and coating morphology. 'Electric breakdown' accompanied by sparks travelling across the metal/electrolyte interface occurs when the voltage rises above a certain point (â¼202Â V), leading to the formation of an off-white 'ceramic-like' BeO coating. The MAO coating consists of two layers-an inner barrier layer and an outer porous layer-and shows improved corrosion resistance and insulation properties. XPS and XRD indicate that the coating has a chemical composition of BeO and is crystalline. Further, corrosion resistance and insulation properties of the coating were estimated by EIS analysis.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Shixiong He, Yanlong Ma, Hong Ye, Xiangdong Liu, Zuoyong Dou, Qingdong Xu, Haijun Wang, Pengcheng Zhang,