Journal
APPLIED SURFACE SCIENCE
Volume 442, Issue -, Pages 264-274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.02.167
Keywords
Amino trimethylene phosphonic acid (ATMP); Conversion layer; electrochemical impedance spectroscopy (EIS); Corrosion resistance; Complexation
Categories
Funding
- National Natural Science Foundation of China [21673130, 21603122]
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Seeing that amino trimethylene phosphonic acid (ATMP) possesses very strong complexation ability to metal ions and the phosphonic acid group has good affinity for the oxidized iron surface, herein a simple and rapid film-forming method (one-step assembly method) was developed to construct the ATMP-Zn complex conversion layers (ATMP-Zn layers for short) on the cold-rolled steel (CRS) substrate. Zinc ions were found to participate in the formation process of ATMP-based composite film, which made the Zn-containing ATMP film significantly different in appearance, thickness, microstructure and film-forming mechanisms from the Zn-free ATMP film. There was mainly iron (i) phosphonate in the Zn-free ATMP film, whereas there were Zn2+-ATMP complex and a certain amount of ZnO in the ATMP-Zn composite film. In addition, electrochemical test results clearly indicate that corrosion resistance of ATMP-Zn composite film was greatly enhanced due to the presence of Zn component. Moreover, the corrosion resistance performance could be controlled by adjusting film-forming time, pH and ATMP concentration in the film-forming solutions. The present study provides a new method for the design and fabrication of high-quality environmentally-friendly conversion layers. (C) 2018 Elsevier B.V. All rights reserved.
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