Electrochemical Corrosion Behavior of Bulk Nanocrystalline Aluminum in Formic Acid Solutions at Ambient Temperature

Author(s): S.G. Wang*, Y.J. Huang, M. Sun.

Journal Name: Innovations in Corrosion and Materials Science

Volume 8 , Issue 2 , 2018

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Abstract:

Background: The electrochemical corrosion properties of bulk nanocrystalline aluminum (BNC-Al) produced by severe rolling technique and its traditional polycrystalline aluminum (TPC-Al) counterpart in 0.022, 0.044, 0.066, 0.11, 0.22, 0.44 mol/L HCOOH solutions were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) at ambient temperature.

Method: The corrosion current densities and capacitances of double electrode layer of BNC-Al were less than those of TPC-Al respectively, and the polarization resistances of BNC-Al were larger than those of TPC-Al in 0.022, 0.044 mol/L HCOOH solutions. However, the corrosion current densities and capacitances of double electrode layer of BNC-Al were larger than those of TPC-Al respectively, and the polarization resistances of BNC-Al were less than those of TPC-Al in 0.066, 0.11, 0.22, 0.44 mol/L HCOOH solutions. The passivation of BNC-Al was enhanced in 0.066, 0.11, 0.22, 0.44 mol/L HCOOH solutions.

Results and Conclusion: These results demonstrated that the corrosion resistances of BNC-Al were enhanced in 0.022 and 0.044 mol/L formic acid solutions at a low potential and in 0.066, 0.11, 0.22, 0.44 mol/L at a high potential, compared to those of TPC-Al. The possible reasons for these electrochemical results for BNC-Al and TPC-Al were proposed in this work.

Keywords: Electrochemical corrosion, nanocrystalline aluminum, potentiodynamic polarization, electrochemical impedance spectroscopy, ambient temperature, rolling technique.

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Article Details

VOLUME: 8
ISSUE: 2
Year: 2018
Page: [93 - 101]
Pages: 9
DOI: 10.2174/2352094909666190103150320

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