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

[ Vol. 8 , Issue. 2 ]

Author(s):

S.G. Wang*, Y.J. Huang and M. Sun   Pages 93 - 101 ( 9 )

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.

Affiliation:

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016

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