The corrosion and passivity of aluminum exposed to dilute sodium sulfate solutions

Moshier, W. C.; Davis, Glyn; Ahearn, J. S.

doi:10.1016/0010-938x(87)90037-0

Cited by 72 publications

(43 citation statements)

References 10 publications

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“…Under almost neutral conditions, the growth of a thick and passive oxide film on aluminum surfaces difficult the electropolymerization process. 38 In this case, the deposition of PPy occurs only in sparingly localized spots. The voltammogram for the potentiodynamic electrodeposition of PPy on aluminum in almost neutral solution (curve 2 in Figure 5) also shows an anodic current density peak at 1.7 V. In this voltammogram, the current density values observed in the forward direction is higher than those observed in the backward scan.…”

Section: Influence Of Ph On the Electropolymerization Of Pyrrolementioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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A síntese eletroquímica de filmes de polipirrol em superfícies de alumínio, em meio aquoso contendo ácido tartárico e pirrol, foi realizada através da técnica galvanostática e por voltametria cíclica. Um mecanismo que considera o crescimento de uma camada porosa de óxido de alumínio em paralelo com a eletrodeposição do filme de polipirrol foi proposto. Foi observado que quanto mais homogênea a distribuição dos poros na camada de óxido, menor a resistência oferecida para o crescimento dos filmes de polipirrol. Também foi observado que os filmes de polipirrol depositados por voltametria cíclica são menos uniformes do que aqueles formados galvanostaticamente. Filmes eletrodepositados galvanostaticamente a maiores densidades de corrente são mais propensos ao processo de superoxidação, como mostram os resultados de FTIR. Além disso, filmes de polipirrol depositados a 2,5 mA cm -2 apresentam um melhor desempenho na proteção de superfícies de alumínio contra corrosão.The electrochemical synthesis of polypyrrole films on aluminum surfaces from aqueous solutions containing tartaric acid and pyrrole was performed using cyclic voltammetry and galvanostatic techniques. A mechanism that considers a porous aluminum oxide layer growing in parallel with the polymeric film explains the polypyrrole electrodeposition on aluminum surfaces. The more homogeneous the distribution of pores on the aluminum oxide layer, the smaller is the resistance offered to the polypyrrole film growth. Polypyrrole films deposited by cyclic voltammetry are much less uniform than those galvanostatically formed. Polymeric films galvanostatically deposited at higher current densities were more susceptible to overoxidation processes than those films formed at lower current densities, as demonstrated by FTIR analyses. Furthermore, films formed at low current density perform better on protecting aluminum surfaces against corrosion.

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Section: Influence Of Ph On the Electropolymerization Of Pyrrolementioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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“…A Pourbaix diagram of aluminum [128] provides information about the thermodynamic stability of different species as a function of potential and pH (Figure 15). At room temperatures and in near-neutral and Cl´-free solutions, aluminum provides a protective insoluble oxide/hydroxide film [129][130][131]. However, the range of passivity varies with temperature, presence of secondary phases and/or precipitates (in bulk material and/or the oxide layer) and existence of substances in the solution that can form soluble complexes or insoluble salts with aluminum [132,133].…”

Section: Electrochemical Properties Of Fe-al Intermetallicsmentioning

confidence: 99%

A Review on the Properties of Iron Aluminide Intermetallics

2016

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Iron aluminides have been among the most studied intermetallics since the 1930s, when their excellent oxidation resistance was first noticed. Their low cost of production, low density, high strength-to-weight ratios, good wear resistance, ease of fabrication and resistance to high temperature oxidation and sulfurization make them very attractive as a substitute for routine stainless steel in industrial applications. Furthermore, iron aluminides allow for the conservation of less accessible and expensive elements such as nickel and molybdenum. These advantages have led to the consideration of many applications, such as brake disks for windmills and trucks, filtration systems in refineries and fossil power plants, transfer rolls for hot-rolled steel strips, and ethylene crackers and air deflectors for burning high-sulfur coal. A wide application for iron aluminides in industry strictly depends on the fundamental understanding of the influence of (i) alloy composition; (ii) microstructure; and (iii) number (type) of defects on the thermo-mechanical properties. Additionally, environmental degradation of the alloys, consisting of hydrogen embrittlement, anodic or cathodic dissolution, localized corrosion and oxidation resistance, in different environments should be well known. Recently, some progress in the development of new micro-and nano-mechanical testing methods in addition to the fabrication techniques of micro-and nano-scaled samples has enabled scientists to resolve more clearly the effects of alloying elements, environmental items and crystal structure on the deformation behavior of alloys. In this paper, we will review the extensive work which has been done during the last decades to address each of the points mentioned above.

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“…[12] This does not seem to be the case in the OY water environment. Studies were carried out on pure aluminum and 2024 alloy showing the influence of sulfates and chlorides in sulfate, perchlorate or phosphate supported solutions.…”

Section: Influence Of Chloridesmentioning

confidence: 91%

A closer look at the internal corrosion test for automotive heat exchangers: the OY water test

Szala¹,

Wainer²,

Vieregge³

2010

Surface & Interface Analysis

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Nowadays, automotive heat exchangers are mainly made from aluminum. Over the last few decades, the development of aluminum brazing sheet has been mainly focused on the improvement of the external corrosion resistance. Recently, the interest of the heat exchanger manufacturers has also moved toward the assessment of the internal corrosion resistance. Accelerated tests are used to simulate in-service conditions. These tests are crucial as they provide information to predict the material and product performance. Various internal corrosion tests have been developed, the so-called 'OY water tests'. Among all companies, the testing parameters can be varied in terms of ion concentrations or pH. Although the OY water tests are constantly being improved, there is so far no common internal corrosion standard as existing for external corrosion assessment. The present work aims at providing better understanding corrosion mechanisms encountered in the OY water media. The role of various elements present in the solution, cupric, chloride, sulfate ions, has been determined. These parameters were assessed via immersion testing. In order to get better understanding of the corrosion mechanism, electrochemical analysis combined with SEM characterization was carried out. The electrochemical analysis enables the understanding of the thermodynamics and kinetics of the corrosion process while immersion tests are performed to quantify the level of corrosion and follow the surface evolution over time.

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The corrosion and passivity of aluminum exposed to dilute sodium sulfate solutions

Cited by 72 publications

References 10 publications

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

A Review on the Properties of Iron Aluminide Intermetallics

A closer look at the internal corrosion test for automotive heat exchangers: the OY water test

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