Artigo de peri??dico
Effect of surface treatments on the localized corrosion resistance of the AA2198???T8 aluminum lithium alloy welded by FSW process
Registro en:
0142-2421
12
51
SI
10.1002/sia.6622
0000-0002-4987-3334
22.956
52.00
Autor
MACHADO, CARULINE de S.C.
KLUMPP, RAFAEL E.
AYUSSO, VICTOR H.
DONATUS, UYIME
MILAGRE, MARIANA X.
ARAUJO, JOAO V. de S.
MACHADO, GLAUSON A.F.
COSTA, ISOLDA
Resumen
In this work, the effect of eight types of surface treatments on the corrosion resistance
of friction stir welded samples of an AA2198???T8 Al???Cu???Li alloy were tested
and compared in an attempt to find suitable alternatives to toxic and carcinogenic
hexavalent chromium treatments. All the samples were anodized and subjected to different
post???anodizing treatments. The post???anodizing treatments were (1) hydrothermal
treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3
6H2O solution with H2O2; (3) hydrothermal treatment in boiling water; (4) hexavalent
chromium conversion coating; and (5) immersion in BTSE (bis???1,2???(triethoxysilyl)
ethane. The corrosion resistance of the treated samples was evaluated by immersion
tests in sodium chloride solution (0.1 mol L???1 NaCl) and electrochemical impedance
spectroscopy (EIS) of the friction stir weldment. The results showed that among the
alternative treatments, the Ce???containing solutions presented the best corrosion
resistance, especially when used without peroxide. Coordena????o de Aperfei??oamento de Pessoal de N??vel Superior (CAPES) Funda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP) CAPES: 99999.000332/2016???00; 99999.000400/2016???05 FAPESP: 13/13235???6; 17/03095???3