Katalytische Gesichtspunkte und Vorgänge bei der Korrosion

Straumanis, M.

doi:10.1007/978-3-642-52046-4_5

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…As aluminum dissolving in hydrochloric acid shows a negative difference effect, it is evident that the reacting surface of the metal is covered by a protective film (11). Consequently, dissolution occurs only through the pores, with part of them acting as anodes and those filled with metalhc residues as cathodes (13,14). The high anodic polarization of aluminum in the pores shows up in the less active potential of --0.6 v of the metal.…”

Section: Discussionmentioning

confidence: 99%

The Rate and Mechanism of Dissolution of Purest Aluminum in Hydrofluoric Acid

Straumanis¹,

Wang²

1955

J. Electrochem. Soc.

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Pure aluminum (99.99%) dissolves in hydrofluoric acid with a rate comparable to that of titanium in the same acid. The rate of dissolution, V (mm3/cm 2 min of hydrogen), in 0.1-6N hydrofluoric acid is in agreement with the empirical equation V = 28 + 275N, and for 6-1ON with V = 20.44N ~.~. Recrystallized Muminum showed the same rates within the error limits (• Of the noble metal salts added to the acid, only nickel and gold increased the dissolution rate; deposits obtained from other salt solutions did not adhere to the surface of the dissolving aluminum. Ammonium fluoride and ammonium chloride additions to the acid decreased the dissolution rate (passivation) because a salt film was formed on the aluminum surface. The potential of aluminum in 2N hydrofluoric acid was -1.22 v, indicating that the extent or thickness of protective surface films was negligible. The dissolution rate of aluminum in sulfuric acid, phosphoric acid, and other acids can be increased considerably by addition of water-soluble fluorides. The behavior of aluminum in hydrofluoric acid, as well as in hydrochloric acid, could be explained qualitatively using the concept of local currents in a manner similar to that proposed earlier.

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Section: Discussionmentioning

confidence: 99%

The Rate and Mechanism of Dissolution of Purest Aluminum in Hydrofluoric Acid

Straumanis¹,

Wang²

1955

J. Electrochem. Soc.

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Ursachen der Korrosion, Übersichtsbericht III (Schluß)

Grubitsch¹

1957

Chemie Ingenieur Technik

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Im ersten Teil wurden die neueren Erkenntnisse über Art und Ursachen der Korrosion, insbesonders die Anlauf‐ und Zundervorgänge im System Metall/Gas sowie die Thermodynamik der Korrosionsvorgänge behandelt. Im zweiten Teil wurden die Korrosionserscheinungen im System Metall/Lösung beschrieben. Während dort vor allem auf die Erscheinungen und Grundlagen der Primärreaktionen der Säurekorrosion eingegangen wurde, wird im vorliegenden abschließenden Bericht die Korrosion in neutralen Elektrolytlösungen behandelt.

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Katalytische Gesichtspunkte und Vorgänge bei der Korrosion

Cited by 2 publications

References 7 publications

The Rate and Mechanism of Dissolution of Purest Aluminum in Hydrofluoric Acid

The Rate and Mechanism of Dissolution of Purest Aluminum in Hydrofluoric Acid

Ursachen der Korrosion, Übersichtsbericht III (Schluß)

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