Long-term atmospheric corrosion behaviour of aluminium alloys 2024 and 7075 in urban, coastal and industrial environments

Sun, Su-Qin; Zheng, Qifei; Li, Defu; Wen, Jing

doi:10.1016/j.corsci.2009.01.016

Cited by 148 publications

(80 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Much less information is available for other metals, but there are some observations of pits having formed inside plateaus for aluminium exposed for up to 20 years in seawater environments [53] and also for shorter term exposures (two years) for aluminium alloy in natural seawater [54]. There also are similar observations for pitting of aluminium alloys under artificially-accelerated saline corrosion conditions [55].…”

Section: Field Observationssupporting

confidence: 48%

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Melchers

2018

CMD

View full text Add to dashboard Cite

For infrastructure applications in marine environments, the eventual initiation of corrosion (and pitting) of steels (and other metals and alloys) often is assumed an inescapable fact, and practical interest then centres on the rate at which corrosion damage is likely to occur in the future. This demands models with a reasonable degree of accuracy, preferably anchored in corrosion theory and calibrated to actual observations under realistic exposure conditions. Recent developments in the understanding of the development of corrosion loss and of maximum pit depth in particular are reviewed in light of modern techniques that permit much closer examination of pitted and corroded surfaces. From these observations, and from sometimes forgotten or ignored observations in the literature, it is proposed that pitting (and crevice corrosion) plays an important role in the overall corrosion process, but that longer term pitting behaviour is considerably more complex than usually considered. In turn, this explains much of the, often high, variability in maximum depths of pits observed at any point in time. The practical implications are outlined.

show abstract

Section: Field Observationssupporting

confidence: 48%

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Melchers

2018

CMD

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Statistical models relate corrosion, in terms of mass loss or gain, to environmental parameters, such as relative humidity (RH) and chloride deposition rate, and show chloride deposition to have a positive contribution to the corrosion rate. 12,19 In field environments these correlations, however, are convoluted by a multiplicity of environmental parameters with little direct insight into the underlying mechanistic linkage between salt load and corrosion rate.…”

Section: Introductionmentioning

confidence: 99%

The controlling role of sodium and carbonate on the atmospheric corrosion rate of aluminum

et al. 2017

View full text Add to dashboard Cite

Aluminum and aluminum alloys are widely used in many outdoor applications due to their inherent corrosion resistance attributed to the formation of a protective oxide layer. While corrosion rates are generally considered low for aluminum in many atmospheric environments, understanding of the corrosion performance over time is necessary to predict the cost, safety, and esthetics of these materials. The vast majority of the knowledgebase of atmospheric aluminum corrosion is built on environment-response relationships; often based on statistical correlation of corrosion rate data with atmospheric environmental conditions. However, there is still a limited mechanistic understanding of corrosion processes associated with this linkage. This lack in knowledge prevents interpretation and limits the extrapolation of these statistical datasets for prediction purposes. Here, the mechanistic dependence of aluminum corrosion rate on salt loading is explored through complimentary experimental and theoretical analysis relating corrosion rate to electrolyte chemistry, volume and corrosion products. From these results a reaction pathway is proposed for the atmospheric corrosion of aluminum that accounts for the governing effects of CO 2 and salt loading on corrosion rate. This reaction pathway provides a new perspective that highlights the importance of the formation and growth of dawsonite (NaAlCO 3 (OH) 2 ), and the subsequent gettering of sodium from the electrolyte leading to the stifling of corrosion kinetics. This study highlights the importance of accounting for the dynamic physical and chemical state of the electrolyte during corrosion in process models and measurement techniques to better understand and predict atmospheric corrosion behavior.

show abstract

“…Among them, pitting corrosion ( , intergranular corrosion (Ref 6,9,10), exfoliation corrosion ( Ref 9,10), and stress corrosion (Ref 6) are all detected on several kinds of aluminum alloys. It was reported that the forged truck wheels made of 2024-T4 exfoliated severely in only 1 or 2 years in the northern states of United States, where deicing salts were used on the highways during the winter months ( Ref 11).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Cui

Cheng

et al. 2015

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Atmospheric corrosion behavior of 7A04 aluminum alloy exposed to a tropical marine environment for 4 years was investigated by weight loss test, morphology observation, and electrochemical impendence spectroscopy (EIS). The results showed that the weight loss of 7A04 alloy in the log-log coordinates can be approximately fitted with two liner segments, in which the slope value of the second segment is significantly lower than that of the first segment. This was mainly attributed to the protectiveness of the corrosion product layer formed on the specimen exposed for 12 and 24 months, which was further confirmed by the EIS results. Corrosion rate presented a significant fluctuation during the exposure test which is due to the deterioration effect caused by chloride ions and time of wetness and the stabilization process of the corrosion product layer. Intergranular corrosion occurred on the 7A04 alloy and then transformed into exfoliation corrosion because of the synergetic effect of the hydrogen-assisted crack initiation and the wedge effect-induced matrix delamination.

show abstract

Long-term atmospheric corrosion behaviour of aluminium alloys 2024 and 7075 in urban, coastal and industrial environments

Cited by 148 publications

References 18 publications

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

The controlling role of sodium and carbonate on the atmospheric corrosion rate of aluminum

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Contact Info

Product

Resources

About