Journal of Applied Electrochemistry

, Volume 39, Issue 2, pp 303–309 | Cite as

EIS investigation of the deposition of trivalent chromium coatings on Al 6063 alloy

  • Hui Cheng Yu
  • Bai Zhen Chen
  • Xi Chang Shi
  • Hai Ying Wu
  • Bin Li
Original Paper
First Online:
Received:
Accepted:

Abstract

The influence of five variables (i.e. deposition temperature, time, bath pH, and concentrations of Cr3+ compound (KCr(SO4)2) and H3PO4) on the preparation of Cr3+ coating on Al 6063 alloy was investigated using AC impedance spectroscopy (EIS) in 3.5 wt% NaCl. The optimal conditions were determined by AC impedance spectroscopy. The results indicated that the formation and quality of the coating were very sensitive to the deposition bath pH. A mechanism was proposed to explain the results. A simple model was derived and experimentally tested in terms of an equivalent circuit. Good agreement was found between the model predictions and the experimental results. The morphologies of the coated and uncoated electrodes were examined by scanning electron microscopy (SEM), and the results also support the proposed surface model.

Keywords

Chemical conversion coating Al alloy Trivalent chromium EIS Corrosion resistance 
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Notes

Acknowledgement

This work was supported by the Natural Science Foundation of Hunan Province, China (No. 50175004).

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Hui Cheng Yu
    • 1
  • Bai Zhen Chen
    • 1
  • Xi Chang Shi
    • 1
  • Hai Ying Wu
    • 2
  • Bin Li
    • 3
  1. 1.School of Metallurgical Science and EngineeringCentral South UniversityChangshaChina
  2. 2.Guangzhou Non-Ferrous Metal Research InstituteGuangzhouChina
  3. 3.Center of Modern Testing and AnalysisCentral South UniversityChangshaChina

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