Acta Metallurgica Sinica (English Letters) >
A Comparative Study on the Corrosion Behaviour of Hard Anodic Coatings on AA 6061 Obtained Using DC and Pulsed DC Power Sources
Received date: 2013-02-13
Revised date: 2013-05-07
Online published: 2014-02-28
The corrosion behaviour of the hard anodic coatings prepared by three different methods viz., conventional hard anodizing (C-HA), pulse hard anodizing (P-HA) and low voltage room temperature pulse hard anodizing (LVP-HA) on AA 6061 was compared using electrochemical impedance spectroscopy (EIS) and linear polarisation. Scanning electron microscope (SEM) was used to study the surface morphology before and after corrosion. EIS data revealed that no significant difference in corrosion resistance was observed among three types. Rp, Icorr and Ecorr were found to be highly stable over the exposure period up to 72 h which confirms the excellent corrosion resistance. The studies indicate that the corrosion resistance of LVP-HA and P-HA, which are processed at lower voltage and at relatively higher temperatures, are comparable to that of C-HA which is processed at sub-zero temperatures and high operating voltages. The corrosion resistance of all coatings was found to be improved after hydrothermal sealing.
Key words： Aluminium; Anodic films; EIS; Polarisation; SEM
Franco M. , Hari Krishna T. , Anju M.Pillai , A. Rajendra , A.K. Sharma . A Comparative Study on the Corrosion Behaviour of Hard Anodic Coatings on AA 6061 Obtained Using DC and Pulsed DC Power Sources[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(6) : 647 -656 . DOI: 10.1007/s40195-013-0091-2
[1]L. Wen, Yaming Wang, Y. Zhou, J.H. Ouyang, L.X. Guo and D.C. Jia, Corros. Sci. 52 (2010) 2687.
[2]M.J. Bartolome, J.F. del Rio, E.Escudero, S.Feliu Jr., V.Lopez, E.Otero and J.A. Gonzalez, Surf. Coat.Technol. 202 (2008) 2783.
[3]Y.L. Huang, H. Shih, H.C. Huang, J. Daugherty, S. Wu, S.Ramanathan, C. Chang and F. Mansfeld, Corros. Sci. 50(2008) 3569.
[4]X.H. Zhao, Y. Zuo, J.M. Zhao, J.P. Xiong and Y.M. Tang,Surf. Coat. Technol. {\bf 200 (2006) 6846.
[5]A.K. Sharma, H. Bhojraj, V.K. Kaila and H. Narayanamurthy,Met. Finish 95 (1997) 14.
[6]J.P.C Dasquet, D. Caillard, E. Conforto, J.P. Bonino and R.Bes, Thin Solid Films 371 (2000) 183.
[7]G.E Thompson, Thin Solid Films, 297 (1997) 192.
[8]J. Edwards, Coating and Surface Treatment Systems for Metals, vol. 38, ASM International, Finishing Publications Ltd.,1994, pp.35--40.
[9]David R. Gabe, Met. Finish. 100 (2002) 52.
[10]L.R. Krishna, A. S. Purnima and G. Sundararajan, Wear,261 (2006) 1095.
[11]A. Rajendra, J.P. Biren, A.K. Sharma, H. Bhojraj, M.M.Nayak and K. Rajanna, Surf. Eng. 21 (2005) 193.
[12]Y. Zuo, P.H. Zhao and J.M Zhao, Surf. Coat. Technol.166 (2003) 237.
[13]J.J. Suay, E. Gimenez, T. Rodriguez. K. Habbib and J.J.Saura, Corros. Sci. 45 (2003) 611.
[14]J.A. Gonzalez, M. Morcillo, E. Escudero, V. Lopez and E.Otero, Surf. Coat. Technol. 153 (2002) 225.
[15]V. Lopez, J.A. Gonzalez, E. Otero, E. Escudero and M.Morcillo, Surf. Coat. Technol. 153 (2002) 235.
[16]A.S. Handy, E. El-Shenawy and T. El-Bitar, Int. J.Electrochem. Sci. 1 (2006) 171.
[17]V. Lopez, E. Otero, A. Bautista and J.A. Gonzalez, Surf.Coat. Technol. 124 (2000) 76.
[18]A. Bautista, J.A. Gonzalez and V. Lopez, Surf. Coat.Technol. 154 (2002) 49.
[19]F. Snogan, C. Blanc, G. Murkowski and N. Pebere, Surf.Coat. Technol. 154 (2002) 94.
[20]V. Lopez, J.A. Gonzalez, A. Bautista and E. Otero, Corros.Sci. 40 (1998) 693.
[21]E. Barsoukov and J.R. Macdonald, Impedance Spectroscopy,Theory, Experiment and Applications, 2nd ed., Wiley-Interscience, A John Wiley & Sons. Inc., New Jersey, 2005,pp.469--479.
[22]C.N. Cao, Principle of Corrosion Electrochemistry,Chemistry Industry Press, Beijing, China, 2004. (in Chinese)
[23]F. Mansfeld, G. Zhang and C. Chen, Plat. Surf. Finish 84 (1997) 72.
[24]J. Liang, P. Bala Srinivasan, C. Blawert and W. Dietzel,Corros. Sci. 52 (2010) 540.
[25]F. Mansfeld, University of Southern California, Los Angeles, CA USA, Technical Report No. 26, Part no. BTR206, Issue:AB, May 1999.
[26]H.B. Zhang and Y. Zuo, Appl. Surf. Sci. 254 (2008)4930.
[27]N.P. Wasekar, A. Jyothirmayi, L.R. Krishna and G.Sundarajan, J. Mater. Eng. Perform. 17 (2008) 708.
[28]S. Wernick, R. Pinner and P.G. Sheasby, The Surface Treatment and Finishing of Aluminium and its Alloys, 6th ed., Vol.2, ASM International, 2001, pp.865--891.
[29]C.S. Kumar, V.S. Rao, V.S. Raja, A.K. Sharma and S.M.Mayanna, Corros. Sci. 44 (2002) 387.
[30]F. Mansfeld and M.W. Kendig, J. Electrochem. Soc. 135 (1988) 828.
/
| 〈 |
|
〉 |
WeChat