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Energy spectrum analysis of anodic oxidation film surface–interface on 7475 aluminum alloy after salt spray corrosion

  • Zhang Jing , Wang Jinchun and Kong Dejun
Published/Copyright: February 22, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 3

Abstract

An oxide film was prepared on the surface of 7475 aluminum alloy by AO (anodic oxidation), and the corrosion behavior of the obtained AO film in 5 ± 0.5% NaCl solution was investigated. The surface–interface morphologies, chemical compositions and phases were analyzed by means of field emission scanning electron microscopy, energy dispersive X-ray spectrometry and X-ray diffraction, respectively, and the chemical elements of the surface and bonding interface were analyzed by a plane scan and line scan after salt spray corrosion. The results show severe corrosion on the original sample surface, the corrosion products are mainly composed of Al oxide after salt spray corrosion. The AO film is only slightly corroded, and the AO film–substrate is still metallurgically combined. Pitting corrosion in the aluminum alloy, primarily caused by Cl−, is the main mode of salt spray corrosion. There are stratified enrichments of Al and O in the AO film interface after the salt spray test, which are related to pitting corrosion and spalling phenomena, while the other elements were uniformly dispersed. The continuous Al2O3 in the AO film effectively prevents Cl− from eroding the metal substrate to improve salt spray corrosion resistance of the 7475 aluminum alloy.

Keywords: 7475 aluminum alloy; Anodic oxidation (AO) film; Salt spray corrosion; Surface–interface; Plane scan analysis
*Correspondence address, Prof. Kong Dejun, Ph.D, Department of Mechanical manufacturing, Changzhou University, Gehu Road, Changzhou City 213164, P. R. China, Tel.: +86-051981169812, Fax: +86-051981169810, E-mail:

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Received: 2016-01-25
Accepted: 2016-12-19
Published Online: 2017-02-22
Published in Print: 2017-03-13

© 2017, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111470
Keywords for this article
7475 aluminum alloy; Anodic oxidation (AO) film; Salt spray corrosion; Surface–interface; Plane scan analysis

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of grain defects on the mechanical behavior of nickel-based single crystal superalloy
  5. Evolution of mechanical properties and microstructure of differently cryogenically treated hot die steel AISI–H13
  6. Microstructure and mechanical properties of nickel particle reinforced magnesium composite: impact of reinforcement introduction method
  7. Microstructure and mechanical properties of carbon nanotube-reinforced ZK61 magnesium alloy composites prepared by spark plasma sintering
  8. Solidification microstructures of Cu–Zr–Al–Y BMG produced by casting in a wedge-shaped copper mold
  9. Energy spectrum analysis of anodic oxidation film surface–interface on 7475 aluminum alloy after salt spray corrosion
  10. Fabrication of Ni/SiC composite powder by mechanical alloying and its effects on properties of copper matrix composites
  11. The sintering behavior and physical properties of Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 lead-free ceramics
  12. The effect of heating rate on the microstructural breakdown required for thixoformability
  13. Nano-particles in powder injection molding of an aluminum matrix composite: Rheological behavior, production and properties
  14. Short Communications
  15. Preparation of vaterite CaCO3 microspheres by fast precipitation method
  16. Slag corrosion resistance of Al4SiC4
  17. DGM News
  18. DGM News
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