Bath Conditions Role in Promoting Corrosion Protection on Aluminum Alloy using Rare Earth Conversion Coatings

Rare earth conversion films were obtained on the AA6061 aluminum alloy by the immersion method varying several experimental conditions such as rare earth (RE) concentration, bath temperature and immersion time. Formation dynamics of RE coatings and the effect of bath conditions on their structure, morphology, topography and corrosion resistance properties were investigated for the protection of this substrate immersed in an aqueous solution of NaCl. X-ray diffraction and scanning electron microscopy results revealed that the increment of the RE concentration caused some small cracks around the aluminum alloy intermetallic phase, whereas bath temperature and immersion time stimulated the conversion of the rare earths to more stable compounds, La 2O 3 and CeO 2. During electrochemical evaluation, the CeCCs displayed a steady state potential at times longer than 250 min; as for LaCCs, longer time intervals were required to reach a stable potential. After covering with rare earth conversion films, the anticorrosive properties of the aluminum alloy were evidently improved. This enhancement is presumably due to the improved barrier properties of the anticorrosion product layer. Additional active corrosion protection was originated from the inhibiting action of the lanthanide ions trapped either as oxides or hydroxides in this surface layer. © 2011 The Electrochemical Society. Journal of the Electrochemical Society Volume 159, Issue 1, 2012, Pages C40-C57

[1]  Dan Zhao,et al.  Corrosion behavior of rare earth cerium based conversion coating on aluminum alloy , 2010 .

[2]  J. Myoung,et al.  Growth characteristics and electrical properties of La2O3 gate oxides grown by thermal and plasma-enhanced atomic layer deposition , 2010 .

[3]  Chao-Sung Lin,et al.  The effect of chromic sulfate concentration and immersion time on the structures and anticorrosive performance of the Cr(III) conversion coatings on aluminum alloys , 2010 .

[4]  W. Fahrenholtz,et al.  The effect of post-treatment time and temperature on cerium-based conversion coatings on Al 2024-T3 , 2010 .

[5]  Qi Zhang,et al.  Using EIS to evaluate anti-corrosion properties of the SiCp/5A06 aluminium MMC treated by cerium conversion coatings , 2010 .

[6]  R. Ichino,et al.  Surface characteristics of chemical conversion coating for Mg-Al alloy , 2009 .

[7]  A. Hughes,et al.  Factors influencing the deposition of Ce-based conversion coatings, Part II: The role of localised reactions , 2009 .

[8]  A. Hughes,et al.  Factors influencing the deposition of Ce-based conversion coatings, part I: The role of Al3+ ions , 2009 .

[9]  A. Torres-Huerta,et al.  Characterization of ceramic sol–gel coatings as an alternative chemical conversion treatment on commercial carbon steel , 2009 .

[10]  Q. Jiang,et al.  An organic chromium-free conversion coating on AZ91D magnesium alloy , 2008 .

[11]  M. Arenas,et al.  Effective corrosion protection of 8090 alloy by cerium conversion coatings , 2008 .

[12]  F. Pan,et al.  Formation and characterization of cerium conversion coatings on magnesium alloy , 2008 .

[13]  Jianbin Luo,et al.  Mechanical properties of La2O3 doped diamond-like carbon films , 2008 .

[14]  R. Arrabal,et al.  The effect of cerium and lanthanum surface treatments on early stages of oxidation of A361 aluminium alloy at high temperature , 2007 .

[15]  Jianbin Luo,et al.  Preparation and characterization of La2O3 doped diamond-like carbon nanofilms (I): Structure analysis , 2007 .

[16]  M. Montemor,et al.  Characterization of rare-earth conversion films formed on the AZ31 magnesium alloy and its relation with corrosion protection , 2007 .

[17]  H. Kwon,et al.  Microstructure and electrochemical characterization of trivalent chromium based conversion coating on zinc , 2007 .

[18]  R. Balasubramaniam,et al.  Corrosion inhibition of aluminum alloy AA 2014 by rare earth chlorides , 2007 .

[19]  M. A. Domínguez-Crespo,et al.  Characteristics of blueing as an alternative chemical conversion treatment on carbon steel , 2007 .

[20]  R. Arrabal,et al.  Ce conversion and electrolysis surface treatments applied to A3xx.x alloys and A3xx.x/SiCp composites , 2007 .

[21]  A. Hughes,et al.  The role of hydrogen peroxide in the deposition of cerium-based conversion coatings , 2006 .

[22]  Ming Sun,et al.  Corrosion protection of aluminum borate whisker reinforced AA6061 composite by cerium oxide-based conversion coating , 2006 .

[23]  R. Arrabal,et al.  Enhanced corrosion resistance of A3xx.x/SiCp composites in chloride media by La surface treatments , 2006 .

[24]  Y. Kobayashi,et al.  Effect of SO42− on the corrosion behavior of cerium-based conversion coatings on galvanized steel , 2006 .

[25]  C. Rébéré,et al.  Synthesis and characterisation of thin cerium oxide coatings elaborated by cathodic electrolytic deposition on steel substrate , 2006 .

[26]  A. Hamdy Corrosion protection of aluminum composites by silicate/cerate conversion coating , 2006 .

[27]  A. Coy,et al.  Effect of La surface treatments on corrosion resistance of A3xx.x/SiCp composites in salt fog , 2006 .

[28]  Y. Kobayashi,et al.  Chemical deposition of cerium oxide thin films on nickel substrate from aqueous solution , 2006 .

[29]  R. Arrabal,et al.  Effect of Ce surface treatments on corrosion resistance of A3xx.x/SiCp composites in salt fog , 2006 .

[30]  J. Scully,et al.  Inhibition of the Oxygen Reduction Reaction on Copper with Cobalt, Cerium, and Molybdate Ions , 2005 .

[31]  C. Vandecasteele,et al.  Roughness and hydrophobicity studies of nanofiltration membranes using different modes of AFM. , 2005, Journal of colloid and interface science.

[32]  A. Hamdy,et al.  Effect of surface preparation prior to cerium pre-treatment on the corrosion protection performance of aluminum composites , 2005 .

[33]  K. Aramaki A self-healing protective film prepared on zinc by treatment in a Ce(NO3)3 solution and modification with Ce(NO3)3 , 2005 .

[34]  A. Decroly,et al.  Study of the deposition of cerium oxide by conversion on to aluminium alloys , 2005 .

[35]  K. Shimizu,et al.  Chromate conversion coatings on aluminium–copper alloys , 2005 .

[36]  S. Zwaag,et al.  A morphological study of filiform corrosive attack on cerated AA2024-T351 aluminium alloy , 2005 .

[37]  M. Arenas,et al.  Surface characterisation of cerium layers on galvanised steel , 2004 .

[38]  F. Zhang,et al.  Cerium oxidation state in ceria nanoparticles studied with X-ray photoelectron spectroscopy and absorption near edge spectroscopy , 2004 .

[39]  M. Montemor,et al.  Silanes and rare earth salts as chromate replacers for pre-treatments on galvanised steel , 2004 .

[40]  K. Aramaki Preparation of self-healing protective films on a zinc electrode treated in a cerium (III) nitrate solution and modified with sodium phosphate and cerium (III) nitrate , 2004 .

[41]  A. Hughes,et al.  Development of cerium‐based conversion coatings on 2024‐T3 Al alloy after rare‐earth desmutting , 2004 .

[42]  J. L. Polo,et al.  Corrosion protection properties of cerium layers formed on tinplate , 2004 .

[43]  Fu-hui Wang,et al.  Cerium Chemical Conversion Coating for Aluminum Alloy 2024-T3 and Its Corrosion Resistance , 2004 .

[44]  Guoqiang Li,et al.  XPS study of cerium conversion coating on the anodized 2024 aluminum alloy , 2004 .

[45]  K. Shimizu,et al.  Chromate conversion coatings on aluminium: influences of alloying , 2004 .

[46]  W. Fahrenholtz,et al.  Deposition and characterization of Cerium Oxide conversion coatings on Aluminum Alloy 7075-T6 , 2004 .

[47]  H. Terryn,et al.  Formation of a cerium-based conversion coating on AA2024: relationship with the microstructure , 2004 .

[48]  Sung-Churl Choi,et al.  Crystallization behavior of nano-ceria powders by hydrothermal synthesis using a mixture of H2O2 and NH4OH , 2004 .

[49]  A. Hamdy,et al.  Corrosion protection of aluminium metal–matrix composites by cerium conversion coatings , 2002 .

[50]  A. Hughes,et al.  The use of macroscopic modelling of intermetallic phases in aluminium alloys in the study of ferricyanide accelerated chromate conversion coatings , 2002 .

[51]  Haifeng Zhou,et al.  Characterization of Cerium-based Conversion Coatings for Corrosion Protection of Aluminum Alloys , 2002 .

[52]  Lorenzo Fedrizzi,et al.  Effect of chemical cleaning on the corrosion behaviour of painted aluminium alloys , 2002 .

[53]  T. Schram,et al.  Study of the formation of chromate conversion coatings on Alclad 2024 aluminum alloy using spectroscopic ellipsometry , 2002 .

[54]  B. Luan,et al.  Protective coatings on magnesium and its alloys — a critical review , 2002 .

[55]  R. Katiyar,et al.  Investigations on the optical properties of sol gel derived lanthanum doped lead titanate thin films , 2002 .

[56]  P. Marcus,et al.  Enhanced corrosion resistance of magnesium and its alloys through the formation of cerium (and aluminium) oxide surface films , 2001 .

[57]  J. Bibber An overview of nonhexavalent chromium conversion coatings—Part I: aluminum and its alloys , 2001 .

[58]  M. Marcos,et al.  Localized alkaline corrosion of alloy AA5083 in neutral 3.5% NaCl solution , 2001 .

[59]  K. Aramaki The inhibition effects of cation inhibitors on corrosion of zinc in aerated 0.5 M NaCl , 2001 .

[60]  M. Donley,et al.  An XPS study of cerium dopants in sol–gel coatings for aluminum 2024-T3 , 2001 .

[61]  G. Frankel,et al.  Effects of chromate and chromate conversion coatings on corrosion of aluminum alloy 2024-T3 , 2001 .

[62]  M. Dabalà,et al.  Cerium-based conversion layers on aluminum alloys , 2001 .

[63]  M. Arenas,et al.  Inhibition of 5083 aluminium alloy and galvanised steel by lanthanide salts , 2001 .

[64]  William R. McGovern,et al.  Formation of Chromate Conversion Coatings on Al‐Cu‐Mg Intermetallic Compounds and Alloys , 2000 .

[65]  R. Greef,et al.  Kinetic and Mechanistic Studies of Rare Earth‐Rich Protective Film Formation Using In Situ Ellipsometry , 2000 .

[66]  S. van der Zwaag,et al.  A filiform corrosion and potentiodynamic polarisation study of some aluminium alloys , 2000 .

[67]  S. Pickering,et al.  Nanostructured cerium oxide: preparation and properties of weakly-agglomerated powders , 1999 .

[68]  Mariano Marcos Bárcena,et al.  The Influence of the Surface Distribution of Al6(MnFe) Intermetallic on the Electrochemical Response of AA5083 Aluminium Alloy in NaCl Solutions , 1998 .

[69]  Y. Teterin,et al.  The XPS spectra of cerium compounds containing oxygen , 1998 .

[70]  T. Schram,et al.  Non-destructive optical characterisation of chromium conversion layers on aluminium , 1998 .

[71]  S. Langenfeld,et al.  A new corrosion protection coating system for pressure-cast aluminium automotive parts , 1997 .

[72]  C. Blanc,et al.  Susceptibility to pitting corrosion of 6056 aluminium alloy , 1997 .

[73]  J. B. Hedrick Rare-earth metal prices in the USA ca. 1960 to 1994 , 1997 .

[74]  C. Blanc,et al.  The role of precipitates enriched with copper on the susceptibility to pitting corrosion of the 2024 aluminium alloy , 1997 .

[75]  C. Blanc,et al.  Susceptibility to Pitting Corrosion of Pure Aluminium, 2024 Alloy and 6056 Alloy in Chloride-Containing Sulphate Solutions , 1996 .

[76]  A. Davenport,et al.  Studies of the Formation of Cerium‐Rich Protective Films Using X‐Ray Absorption Near‐Edge Spectroscopy and Rotating Disk Electrode Methods , 1996 .

[77]  C. M. Haas,et al.  Influence of metallurgy on the protective mechanism of chromium-based conversion coatings on aluminum–copper alloys , 1994 .

[78]  M. Metikoš-huković,et al.  Inhibition of the hydrogen evolution reaction on aluminium covered by ‘spontaneous’ oxide , 1994 .

[79]  K. Shimizu,et al.  The growth of chromate conversion coatings on high purity aluminium , 1993 .

[80]  K. Shimizu,et al.  The development of chemical conversion coatings on aluminium , 1993 .

[81]  K. Shimizu,et al.  The morphology, structure and mechanism of growth of chemical conversion coatings on aluminium , 1992 .

[82]  B. Hinton Corrosion inhibition with rare earth metal salts , 1992 .

[83]  W. Stickle,et al.  Handbook of X-Ray Photoelectron Spectroscopy , 1992 .

[84]  A. Davenport,et al.  XANES investigation of the role of cerium compounds as corrosion inhibitors for aluminum , 1991 .

[85]  H. Isaacs The localized breakdown and repair of passive surfaces during pitting , 1989 .

[86]  B. Hinton,et al.  The corrosion inhibition of zinc with cerous chloride , 1989 .

[87]  O. Lunder,et al.  The Effect of Alkaline-Etch Pretreatment on the Pitting Corrosion of Wrought Aluminum , 1988 .

[88]  P. Natishan,et al.  Surface Charge Considerations in the Pitting of Ion‐Implanted Aluminum , 1988 .

[89]  A. Kotani,et al.  Many-body effects in core-level spectroscopy of rare-earth compounds , 1988 .

[90]  A. J. Sedriks Plenary Lecture—1986: Effects of Alloy Composition and Microstructure on the Passivity of Stainless Steels , 1986 .

[91]  B. Mazurkiewicz,et al.  The electrochemical behaviour of the Al2Cu intermetallic compound , 1983 .

[92]  G. Thompson,et al.  An electronoptical study of the conversion coating formed on aluminium in a chromate/fluoride solution , 1979 .

[93]  J. Galvele,et al.  Pitting potential of high purity binary aluminium alloys—I. AlCu alloys. Pitting and intergranular corrosion , 1977 .

[94]  J. Galvele,et al.  Mechanism of intergranular corrosion of Al-Cu alloys , 1970 .

[95]  R. Finnegan,et al.  Natural occurrence of 2-hydroxyxanthone. , 1965, Journal of pharmaceutical sciences.