In this study, atmospheric corrosion behaviour of pure Al 1060 after 1-48 months of exposure in a tropical marine environment was studied. The corrosion kinetics was evaluated by weight loss measurement and pit depth calculation. The rate controlling steps as well as the effect of the native oxide film and the corrosion product layer on the corrosion process were analysed via electrochemical impendence spectroscopy. The results showed that synergetic effect of the deposition rate of chloride ions and time of wetness resulted in an abnormal increase in weight loss and an obvious fluctuation in corrosion rate. During the initial exposure period, corrosion was controlled by charge transfer process attributed to the limited corrosion area. With the increasing exposure duration, the rate controlling step was changed to diffusion due to the barrier effect of the corrosion products. Simultaneously, initiation of the new corrosion areas and the growth of the stable pits dominated the corrosion process during this period, resulting in a lower charge transfer resistance, a larger pit depth and a bigger corrosion area.
HirschJ: ‘Aluminium in innovative light-weight car design’Mater. Trans.201152818–824.
2.
DursunT and SoutisC: ‘Recent developments in advanced aircraft aluminium alloys’Mater. Des.201456862–871.
3.
HeinzAHaszlerAKeidelCMoldenhauerSBenedictusR and MillerWS: ‘Recent development in aluminium alloys for aerospace applications’Mater. Sci. Eng. A2000A280102–107.
4.
De la FuenteDOtero-HuertaE and MorcilloM: ‘Studies of long-term weathering of aluminium in the atmosphere’Corros. Sci.2007493134–3148.
5.
S. Q. Sun, Q. F. Zheng, D. F. Li and J. G. Wen:‘Long-term atmospheric corrosion behaviour of aluminium alloys 2024 and 7075 in urban, coastal and industrial environments’Corros. Sci.200951719–727.
6.
S. Q. Sun, Q. F. Zheng, D. F. Li, S. Q. Hu and J. G. Wen:‘Exfoliation corrosion of extruded 2024-T4 in the coastal environments in China’Corros. Sci.2011532527–2538.
7.
WangBWangZHanW and KeW: ‘Atmospheric corrosion of aluminium alloy 2024-T3 exposed to salt lake environment in Western China’Corros. Sci.20125963–70.
8.
LiTLiXGDongCF and ChengYF: ‘Characterization of atmospheric corrosion of 2A12 aluminum alloy in tropical marine environment’J. Mater. Eng. Perform.201019591–598.
9.
LiuYWangZ and KeW: ‘Study on influence of native oxide and corrosion products on atmospheric corrosion of pure Al’Corros. Sci.201480169–176.
10.
VilcheJVarelaFAcunaGCodaroENRosalesBMFernándezA and MorienaG: ‘A survey of Argentinean atmospheric corrosion: I—Aluminium and zinc samples’Corros. Sci.199537941–961.
11.
DanZMutoI and HaraN: ‘Effects of environmental factors on atmospheric corrosion of aluminium and its alloys under constant dew point conditions’Corros. Sci.20125722–29.
12.
Q. T. Jiang, K. Zhang, X. G. Li, Y. J. Li, M. L. Ma and G. L. Shi and J. W. Yuan: ‘Atmospheric corrosion of Ma-rare earth alloy in typical inland and marine environments’Corros. Eng. Sci. Technol.201449651–655.
13.
BudovG: ‘Third international congress on metallic corrosion’Moscow19694445–453.
14.
GraedelTE: ‘Corrosion mechanisms for aluminum exposed to the atmosphere’J. Electrochem. Soc.1989136204C–212C.
15.
MendozaAR and CorvoF: ‘Outdoor and indoor atmospheric corrosion of non-ferrous metals’Corros. Sci.2000421123–1147.
16.
E. Schindelholz, R. G. Kelly, I. S. Cole, W. D. Ganther and T. H. Muster: ‘Comparability and accuracy of time of wetness sensing methods relevant for atmospheric corrosion’Corros. Sci.201367233–241.
17.
Z. Y. Cui, X. G. Li, K. Xiao and C. F. Dong: ‘Atmospheric corrosion of field-exposed AZ31 magnesium in a tropical marine environment’Corros. Sci.201376243–256.
18.
Szklarska-SmialowskaZ: ‘Pitting corrosion of aluminum’Corros. Sci.1999411743–1767.
19.
MaYLiY and WangF: ‘Corrosion of low carbon steel in atmospheric environments of different chloride content’Corros. Sci.200951997–1006.
20.
WangJWangZ and KeW: ‘A study of the evolution of rust on weathering steel submitted to the Qinghai salt lake atmospheric corrosion’Mater. Chem. Phys.2013139225–232.
21.
Z. Y. Cui, X. G. Li, K. Xiao, C. F. Dong, Z. Y. Liu and L. W. Wang: ‘Corrosion behavior of field-exposed zinc in a tropical marine atmosphere’Corrosion201470731–748.
22.
V. López, J. A. González, E. Otero, E. Escudero and M. Morcillo: ‘Atmospheric corrosion of bare and anodised aluminium in a wide range of environmental conditions. Part II: Electrochemical responses’Surf. Coat. Technol.2002153235–244.
23.
I. S. Cole, W. D. Ganther, J. D. Sinclair, D. Lau and D. A. Paterson: ‘A study of the wetting of metal surfaces in order to understand the processes controlling atmospheric corrosion’J. Electrochem. Soc.2004151B627–B635.
24.
ColeIS and GantherW: ‘Experimental determination of duration of wetness on metal surfaces’Corros. Eng. Sci. Technol.200843156–162.
25.
F. Corvo, T. Pérez, Y. Martin, J. Reyes, L. R. Dzib, J. González-Sánchez and A. Castañeda:‘Time of wetness in tropical climate: Considerations on the estimation of TOW according to ISO 9223 standard’Corros. Sci.200850206–219.
26.
‘Corrosion of metals and alloys–classification of corrosivity of atmospheres’ISO 92231992.
27.
‘Corrosion of metals and alloys–corrosivity of atmospheres-Measurement of pollution’ISO 92251992.
28.
MaYLiY and WangF: ‘The effect of β-FeOOH on the corrosion behavior of low carbon steel exposed in tropic marine environment’Mater. Chem. Phys.2008112844–852.
29.
TownsendHE and ZoccolaJC: STP767, ASTM, Philadelphia, PA198245.
30.
MelchersRE: ‘Bi-modal trend in the long-term corrosion of aluminium alloys’Corros. Sci.201482239–247.
31.
D. de la Fuente, I. Díaz, J. Simancas, B. Chico and M. Morcillo: ‘Long-term atmospheric corrosion of mild steel’Corros. Sci.201153604–617.
32.
MaYLiY and WangF: ‘The atmospheric corrosion kinetics of low carbon steel in a tropical marine environment’Corros. Sci.2010521796–1800.
33.
McCaffertyE: ‘Sequence of steps in the pitting of aluminum by chloride ions’Corros. Sci.2003451421–1438.
34.
FrankelGS: ‘Pitting corrosion of metals a review of the critical factors’J. Electrochem. Soc.19981452186–2198.
35.
A. Boag, R. J. Taylor, T. H. Muster, N. Goodman, D. McCulloch, C. Ryan, B. Rout, D. Jamieson and A. E. Hughes: ‘Stable pit formation on AA2024-T3 in a NaCl environment’Corros. Sci.20105290–103.
36.
R. K. Gupta, N. L. Sukiman, M. K. Cavanaugh, B. R. W. Hinton, C. R. Hutchinson and N. Birbilis: ‘Metastable pitting characteristics of aluminium alloys measured using current transients during potentiostatic polarisation’Electrochim. Acta201266245–254.
37.
AminMA: ‘Metastable and stable pitting events on Al induced by chlorate and perchlorate anions—Polarization, XPS and SEM studies’Electrochim. Acta2009541857–1863.
38.
TruemanAR: ‘Determining the probability of stable pit initiation on aluminium alloys using potentiostatic electrochemical measurements’Corros. Sci.2005472240–2256.
39.
Z. Y. Cui, X. G. Li, K. Xiao, C. F. Dong, Z. Y. Liu and L. W. Wang: ‘Pitting corrosion behavior of AZ31 magnesium in tropical marine atmosphere’Corros. Eng. Sci. Technol.201449363–371.
40.
AzizP and GodardHP: ‘Pitting corrosion characteristics of aluminum-influence of magnesium and manganese’Indian Eng. Chem.1952441791–1795.
41.
ElolaAOteroT and PorroA: ‘Evolution of the pitting of aluminum exposed to the atmosphere’Corrosion199248854–863.
42.
WaltonCSprowlsD and NockJJR: ‘Resistance of aluminum alloys to weathering’Corrosion19539345–358.
43.
RodríguezJJSHernándezF and GonzálezJEG: ‘The effect of environmental and meteorological variables on atmospheric corrosion of carbon steel, copper, zinc and aluminium in a limited geographic zone with different types of environment’Corros. Sci.200345799–815.
