Abstract
This research demonstrates a novel one-step electrochemical method to fabricate thick bilayer coatings on magnesium alloy in acid phosphate electrolyte containing aniline monomer and styrene-acrylic emulsion (SAE) with pulsed DC voltage. The morphologies, XRD and FTIR results show that the bilayer coating consists of an inner oxide layer and an outer polyaniline (PANI)/SAE composite layer. It is believed that the bilayered structure achieved results from a hybrid process combining electropolymerization (EPM) of aniline, electrophoretic deposition (EPD) of SAE and plasma electrolyte oxidation (PEO) of magnesium alloy substrate. Electrochemical corrosion tests indicate that the bilayer coating can provide superior corrosion protection to the magnesium alloy substrate in 3.5 wt.% NaCl solution.
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References
Eliezer D, Aghion E, Froes F H. Magnesium science, technology and applications. Advanced Performance Materials, 1998, 5(3): 201–212
Mordike B L, Ebert T. Magnesium: properties — applications — potential. Materials Science and Engineering A, 2001, 302(1): 37–45
Song G L, Atrens A. Corrosion mechanisms of magnesium alloys. Advanced Engineering Materials, 1999, 1(1): 11–33
Kainer K U, Srinivasan P B, Blawert C, et al. Corrosion of Magnesium and Its Alloys. Oxford: Elsevier, 2010
Gray J E, Luan B. Protective coatings on magnesium and its alloys —a critical review. Journal of Alloys and Compounds, 2002, 336(1–2): 88–113
Singh R. Surface modification for mitigation of corrosion/localised corrosion of magnesium alloys. Surface Engineering, 2007, 23(5): 319–323
Blawert C, Dietzel W, Ghali E, et al. Anodizing treatments for magnesium alloys and their effect on corrosion resistance in various environments. Advanced Engineering Materials, 2006, 8(6): 511–533
Walsh F C, Low C T J, Wood R J K, et al. Plasma electrolytic oxidation (PEO) for production of anodised coatings on light-weight metal (Al, Mg, Ti) alloys. Transactions of the Institute of Metal Finishing, 2009, 87(3): 122–135
Song G L. An irreversible dipping sealing technique for anodized ZE41 Mg alloy. Surface and Coatings Technology, 2009, 203(23): 3618–3625
Duan H P, Du K Q, Yan C W, et al. Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D. Electrochimica Acta, 2006, 51(14): 2898–2908
Srinivasan P B, Scharnagl N, Blawert C, et al. Enhanced corrosion protection of AZ31 magnesium alloy by duplex plasma electrolytic oxidation and polymer coatings. Surface Engineering, 2010, 26(5): 354–360
Guo X H, An M Z. Experimental study of electrochemical corrosion behaviour of bilayer on AZ31B Mg alloy. Corrosion Science, 2010, 52(12): 4017–4027
Lamaka S V, Knornschild G, Snihirova D V, et al. Complex anticorrosion coating for ZK30 magnesium alloy. Electrochimica Acta, 2009, 55(1): 131–141
Bestetti M, Cavallotti P L, Da Forno A, et al. Anodic oxidation and powder coating for corrosion protection of AM60B magnesium alloys. Transactions of the IMF, 2007, 85(6): 316–319
Mandelli A, Bestetti M, Da Forno A, et al. A composite coating for corrosion protection of AM60B magnesium alloy. Surface and Coatings Technology, 2011, 205(19): 4459–4465
Bai K F, Zhang Y, Fu Z Y, et al. Fabrication of chitosan/magnesium phosphate composite coating and the in vitro degradation properties of coated magnesium alloy. Materials Letters, 2012, 73: 59–61
Wu C J, Wen Z H, Dai C S, et al. Fabrication of calcium phosphate/chitosan coatings on AZ91D magnesium alloy with a novel method. Surface and Coatings Technology, 2010, 204(20): 3336–3347
Jiang Y F, Yang H S, Bao Y F, et al. Characterization of composite coatings produced by plasma electrolytic oxidation plus cathodic electrophoretic deposition on magnesium alloy. Advanced Materials Research, 2011, 146–147: 1126–1131
Shang W, Chen B Z, Shi X C, et al. Electrochemical corrosion behavior of composite MAO/sol-gel coatings on magnesium alloy AZ91D using combined micro-arc oxidation and sol-gel technique. Journal of Alloys and Compounds, 2009, 474(1–2): 541–545
Wang J W, Tang J W, He Y D. Top coating of low-molecular weight polymer MALPB used for enhanced protection on anodized AZ31B Mg alloys. Journal of Coatings Technology and Research, 2010, 7(6): 737–746
Sathiyanarayanan S, Maruthan K, Muthukrishnan S, et al. High performance polyaniline containing coating system for wet surfaces. Progress in Organic Coatings, 2009, 66(2): 113–117
Yuan D S, Zhou T X, Zhou S L, et al. Nitrogen-enriched carbon nanowires from the direct carbonization of polyaniline nanowires and its electrochemical properties. Electrochemistry Communications, 2011, 13(3): 242–246
Bhadra S, Khastgir D, Singha N K, et al. Progress in preparation, processing and applications of polyaniline. Progress in Polymer Science, 2009, 34(8): 783–810
Zhang R H, Liang J, Wang Q. Preparation and characterization of graphite-dispersed styrene-acrylic emulsion composite coating on magnesium alloy. Applied Surface Science, 2012, 258(10): 4360–4364
Sathiyanarayanan S, Muthkrishnan S, Venkatachari G. Corrosion protection of steel by polyaniline blended coating. Electrochimica Acta, 2006, 51(28): 6313–6319
Conroy K G, Breslin C B. The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties. Electrochimica Acta, 2003, 48(6): 721–732
Shao Y W, Huang H, Zhang T, et al. Corrosion protection of Mg-5Li alloy with epoxy coatings containing polyaniline. Corrosion Science, 2009, 51(12): 2906–2915
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Liang, J., Zhang, RH., Peng, ZJ. et al. One-step electrochemical fabrication of bilayered MgO/polymer coating on magnesium alloy. Front. Mater. Sci. 8, 307–312 (2014). https://doi.org/10.1007/s11706-014-0250-z
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DOI: https://doi.org/10.1007/s11706-014-0250-z