Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy

被引：11
作者：
Jegdic, B. V. [1 ]
Zivkovic, Lj. S. [2 ]
Popic, J. P. [1 ]
Rogan, J. [3 ]
Bajat, J. B. [3 ]
Miskovic-Stankovic, V. B. [3 ]
机构：
[1] Univ Belgrade, ICTM Dept Electrochem, Njegoseva 12, Belgrade, Serbia
[2] Univ Belgrade, Vinca Inst Nucl Sci, POB 522, Belgrade 11001, Serbia
[3] Univ Belgrade, Fac Technol & Met, Karnegijeva 4,POB 3503, Belgrade 11120, Serbia
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2016年 / 67卷 / 11期
关键词：
aluminum; cataphoretic deposition; cerium doping; corrosion; EIS; epoxy coating; SOL-GEL COATINGS; SALT-ACTIVATED NANOPARTICLES; OXIDE CONVERSION COATINGS; AA2024-T3; ALUMINUM-ALLOY; DIP GALVANIZED STEEL; CE-BASED COATINGS; RARE-EARTH SALTS; INHIBITION PERFORMANCE; SILANE FILMS; MILD-STEEL;
D O I：
10.1002/maco.201608827
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, corrosion protection efficiency of undoped epoxy and epoxy coating doped with cerium on aluminum alloy AA6060 is evaluated over prolonged exposure to 3wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Different amounts of Ce(NO3)(3) are added into the epoxy suspension used for the cataphoretic deposition. Suspension stability is characterized by zeta potential and particle size values. Water content and thermal stability of the coatings were determined by thermogravimetric analysis. Insufficient corrosion stability, very close to that of undoped epoxy, is revealed for the coating with 1mM Ce. Higher cerium doping contributes to a significant increase in corrosion stability (2-3 orders of magnitude greater charge-transfer resistance). Epoxy coating doped with 5mM Ce displays a pronounced self-healing ability and the best corrosion protection and adhesion, owing to evenly distributed cerium precipitates on the aluminum surface. In the case of 10mM Ce-doped coating, the formation of Ce clusters and higher porosity causes a certain lowering of the protective ability. EIS measurements on epoxy coating with artificial defect confirm these findings.
引用
收藏
页码：1173 / 1184
页数：12
相关论文
共 52 条
[11]   Silanes and rare earth salts as chromate replacers for pre-treatments on galvanised steel [J].
Ferreira, MGS ;
Duarte, RG ;
Montemor, MF ;
Simoes, AMP .
ELECTROCHIMICA ACTA, 2004, 49 (17-18) :2927-2935
[12]  
Hatch JohnE., 1984, Aluminum: properties and physical metallurgy, V1
[13]   Corrosion inhibition of 7000 series aluminium alloys with cerium diphenyl phosphate [J].
Hill, Julie-Anne ;
Markley, Tracey ;
Forsyth, Maria ;
Howlett, Patrick C. ;
Hinton, Bruce R. W. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (05) :1683-1690
[14]  
*ISO, 46241978E ISO
[15]   Corrosion protection of aluminium alloy by cerium conversion and conducting polymer duplex coatings [J].
Johansen, Herbert D. ;
Brett, Christopher M. A. ;
Motheo, Artur J. .
CORROSION SCIENCE, 2012, 63 :342-350
[16]   Effect of coating parameters on the microstructure of cerium oxide conversion coatings [J].
Johnson, BY ;
Edington, J ;
O'Keefe, MJ .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 361 (1-2) :225-231
[17]   Microstructural characteristics and corrosion behavior of cerium oxide conversion coatings on AA6063 [J].
Kanani, M. ;
Danaee, I. ;
Maddahy, M. H. .
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION, 2014, 65 (11) :1073-1079
[18]   Multifunctional epoxy coatings combining a mixture of traps and inhibitor loaded nanocontainers for corrosion protection of AA2024-T3 [J].
Kartsonakis, I. A. ;
Athanasopoulou, E. ;
Snihirova, D. ;
Martins, B. ;
Koklioti, M. A. ;
Montemor, M. F. ;
Kordas, G. ;
Charitidis, C. A. .
CORROSION SCIENCE, 2014, 85 :147-159
[19]   Influence of cerium molybdate containers on the corrosion performance of epoxy coated aluminium alloys 2024-T3 [J].
Kartsonakis, Ioannis A. ;
Balaskas, Andronikos C. ;
Kordas, George .
CORROSION SCIENCE, 2011, 53 (11) :3771-3779
[20]   An XPS study of cerium dopants in sol-gel coatings for aluminum 2024-T3 [J].
Kasten, LS ;
Grant, JT ;
Grebasch, N ;
Voevodin, N ;
Arnold, FE ;
Donley, MS .
SURFACE & COATINGS TECHNOLOGY, 2001, 140 (01) :11-15
123456