Self-healing characteristic of praseodymium conversion coating on AZNd Mg alloy studied by scanning electrochemical microscopy |
| |
| Institution: | 1. ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW, Australia;2. Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA;3. Boston Scientific, G. Martinolaan 50, Maastricht, Netherlands;4. ARC Centre of Excellence for Electromaterials Sciences, University of Wollongong, NSW, Australia;1. Centre for Sol-Gel Coatings, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad, 500005 Telangana State, India;2. Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi, 630006 Tamil Nadu, India;3. Department of Chemical Engineering, National Institute of Technology, Warangal, 506004 Telangana State, India |
| |
| Abstract: | Application of rare earth conversion coatings as a surface treatment for magnesium has been the subject of several studies revealing the potential to act as an effective passivating layer. Herein a mechanistic study is presented on the formation of a rare earth conversion layer based on Pr(NO3)3 on AZ80X magnesium alloy in simulated biological (buffered) solution. Scanning electrochemical microscopy (SECM) was used to investigate the insulating properties and degradation behaviour of the Pr conversion layer. The self-healing properties of the conversion layer in the presence of Pr3 + were also studied using SECM. Results revealed the self-healing characteristic of the Pr conversion film in the presence of active, Pr3 +, species. The Pr conversion layer provided passivation in the short term by producing an electrochemically inert and insulating layer. SECM results in potentiometric mode elucidated the role of near surface pH in the formation of the conversion coating. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
