Next Article in Journal
High Temperature Corrosion Behaviors of 20G Steel, Hastelloy C22 Alloy and C22 Laser Coating under Reducing Atmosphere with H2S
Previous Article in Journal
Individual and Combined Coatings of Chitosan and Carnauba Wax with Oregano Essential Oil to Avoid Water Loss and Microbial Decay of Fresh Cucumber
Open AccessArticle

The Preparation and Properties of the Brown Film by Micro-arc Oxidized on In-Situ TiB2/7050Al Matrix Composites

1
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
3
Shanghai Institute of Satellite Engineering, Shanghai 200240, China
4
Shanghai Aircraft Design and Research Institute, Shanghai 201203, China
5
Anhui Province Engineering Research Center of Aluminium Matrix Composites, Huaibei 235000, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(7), 615; https://doi.org/10.3390/coatings10070615
Received: 11 June 2020 / Revised: 25 June 2020 / Accepted: 26 June 2020 / Published: 29 June 2020
The brown or grayish-white color films were prepared by the micro-arc oxidation (MAO) method on in-situ TiB2/7050Al composites using these alkaline electrolytes with/without KMnO4 as an additive. The microstructure, elemental composition, chemical state and corrosion behavior have been investigated by the microstructure characterizations and electrochemistry measurements on the MAO films comparatively. The results indicated that a brown film was obtained via adding KMnO4 into the alkaline electrolyte. The coloration mechanism of the brown color can be ascribed to the existence of MnO inside the film. Furthermore, the initiation of corrosion to the Al composite was intensively hindered by the brown MAO film. Compared with the Al substrate and grayish-white film, the brown MAO film exhibited the elevated corrosion potential and reduced corrosion current. Therefore, the brown film has presented an optimized corrosion resistance for the composite. View Full-Text
Keywords: Al matrix composites; micro-arc oxidation; surface modification; corrosion resistance Al matrix composites; micro-arc oxidation; surface modification; corrosion resistance
Show Figures

Figure 1

MDPI and ACS Style

Xia, C.; Huang, J.; Tao, J.; Wang, S.; Cai, L.; Wang, M.; Chen, D.; Wang, H. The Preparation and Properties of the Brown Film by Micro-arc Oxidized on In-Situ TiB2/7050Al Matrix Composites. Coatings 2020, 10, 615.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop