Journal
SURFACE & COATINGS TECHNOLOGY
Volume 236, Issue -, Pages 284-289Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.09.059
Keywords
Zr-based conversion coatings; Open circuit potential; FE-AES maps; Depth profiles; XPS
Funding
- Research Program of the Materials innovation institute M2i [M22.6.10377]
Ask authors/readers for more resources
In this work, a new surface pre-treatment based on a modified hexafluorozirconic acid solution with addition of copper was studied as a replacement of the phosphating process. The main purpose of this study is to compare the formation mechanism and kinetics of Zr-based conversion coatings on three different base substrates: Aluminium alloy (AA) 6014, cold rolled steel and hot dip galvanized steel. For that purpose, open circuit potential (OCP) measurements during the deposition of the conversion coatings are performed in combination with different ex-situ surface characterization techniques. The elemental distribution was analyzed by means of (Field Emission) Auger Electron Spectroscopy (FE-AES) depth profiles and mappings. Furthermore, the surface chemistry of the conversion layer was evaluated by X-ray Photoelectron Spectroscopy (XPS). The results showed that while the mechanism of formation is similar for the different substrates, the rate of formation strongly depends on the substrate type. Additionally, the thickness and lateral and in-depth elemental distribution of the Zr-based conversion layers also largely depend on the underlying metal. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available