The influence of CO2, AlCl3·6H2O, MgCl2·6H2O, Na2SO4 and NaCl on the atmospheric corrosion of aluminum

Blücher, Daniel Bengtsson; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar

doi:10.1016/j.corsci.2005.05.027

Cited by 53 publications

(28 citation statements)

References 15 publications

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“…While Blucher et al observed the stagnation phenomena and related it to the presence of CO 2 in the atmosphere, they proposed that CO 2 neutralizes the pH of the cathodic region and thus inhibits corrosion at high pH as Al is amphoteric. 25,38 However, there still remains a high chloride content within the electrolyte, and thus some corrosion would be expected to occur, even at a more neutral pH. Therefore, pH neutralization alone could not fully account for the stagnation of the corrosion rate.…”

Section: Discussionmentioning

confidence: 99%

“…28 The presence of dawsonite post exposure has been previously identified by others on coupons exposed to atmospheric levels of CO 2 , whereas samples exposed without CO 2 (<1 ppm) did not exhibit dawsonite, but rather a metal-corrosion product interface that was devoid of Na and only contained some Cl. 38 The corrosion product in that case was identified as bayerite (α-Al(OH) 3 ) through XRD. 38 Previous corrosion pathways ignored formation and presence of dawsonite, and described corrosion in Al as an autocatalytic phenomena, where Cl − is released at the cathode and migrates back to the anode, which would result in a continuous process.…”

Section: Discussionmentioning

confidence: 99%

“…38 The corrosion product in that case was identified as bayerite (α-Al(OH) 3 ) through XRD. 38 Previous corrosion pathways ignored formation and presence of dawsonite, and described corrosion in Al as an autocatalytic phenomena, where Cl − is released at the cathode and migrates back to the anode, which would result in a continuous process. 13 The results of this study and subsequent interpretation do not deny this reaction pathway, but indicate that the kinetics are greatly decelerated.…”

Section: Discussionmentioning

confidence: 99%

“…Although dawsonite formation has been previously reported for atmospheric exposures, it has not been considered as an integral part of the corrosion process. 13,38 Thermodynamic calculations of corrosion products under atmospheric exposure conditions (e.g., CO 2 ) demonstrate dawsonite as a predominant phase that should be considered in atmospheric corrosion of aluminum in saline environments. These calculations were made by allowing or suppressing the formation of aluminum hydroxides to represent cases of low and high levels of Na and CO 2 in solution with respect to Al.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…Blucher et al [91] corrosion rates were lower due to the inability of Mg 2+ to maintain the pH in the alkaline region. The corrosion rates were the least in Na 2 SO 4 solution due to the inability of sulfate ions to initiate pitting of aluminum as compared to chlorides.…”

Section: Atmospheric Corrosionmentioning

confidence: 99%

Correlation Studies between Outdoor Exposure and Accelerated Laboratory Corrosion Tests for Galvanic and Non-Galvanic Ceramic-Aluminum Couples

Srinivasan

Hihara

2009

ECS Trans.

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This dissertation is dedicated to Deepika, my wife.ii ACKNOWLEDGEMENTS I would like to express my gratitude and sincere thanks to Dr. Lloyd H. Hihara for his support, endless enthusiasm and encouragement. This dissertation has benefited immensely from his comments, reviews and opinions. I would like to thank him for his time, patience and help. I would also like to thank the dissertation committee -Dr. Ceramics and 6061-T6 Al coupons were coupled together using 6061-T6 Cclamps. Outdoor experiments for 3, 6, and 12-month exposure periods were conducted at eight different test sites, to determine corrosion behavior for various climate and environmental conditions (i.e., rain forest, alpine, marine, volcanic, industrial, agricultural, and arid). Accelerated laboratory experiments include controlled humiditychamber experiments and cyclic corrosion test chamber (CCTC) experiments following modified GM9540P using different chloride-containing solutions. Corrosion rates were v determined at the ceramic-Al interface for the outdoor and accelerated laboratory experiments using weight loss data. Polarization experiments were conducted on 6061-T6Al to study the governing corrosion mechanisms in different chloride solutions. Zeroresistant ammeter (ZRA) studies were conducted between 6061-T6 Al and the conductive ceramics (TiB 2 ) inside a humidity chamber by spraying different chloride solutions in intervals of 24 hours for 5 days to simulate rain and the steady-state galvanic corrosion rates (i Galv ) were observed.

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Properties, Use, and Performance of Aluminum and Its Alloys

Ghali¹

2010

Corrosion Resistance of Aluminum and Magnesium Alloys

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The influence of CO2, AlCl3·6H2O, MgCl2·6H2O, Na2SO4 and NaCl on the atmospheric corrosion of aluminum

Cited by 53 publications

References 15 publications

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

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

Correlation Studies between Outdoor Exposure and Accelerated Laboratory Corrosion Tests for Galvanic and Non-Galvanic Ceramic-Aluminum Couples

Properties, Use, and Performance of Aluminum and Its Alloys

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