Investigation of Fluid Circulation Effect on the Internal Corrosion Resistance of Automotive Heater Core

Boisier, Grégory; Tierce, Séverin; Casenave, Christian; Robidou, Herveline; Pébère, Nadine; Blanc, Christine; Mankowski, Georges

doi:10.4271/2006-01-0982

Cited by 1 publication

(1 citation statement)

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“…6͒, and the three-step mechanism could explain the corrosion mechanisms in commercial alloys such as AA2024 and why the dissolution of copper-rich intermetallics occurs independently of the nature of the electrolyte. 34 Indeed, the results showed that the most significant feature was the potential distribution, which provokes the increase of oxygen reduction at the interface and thus induces a strong variation of the pH of the electrolyte. Our study shows that a simple model ͑pure aluminum/pure copper͒ is relevant for the study of what happens in copper-rich aluminum alloys and also underlines the specific and important role of the Al/Cu interface.…”

Section: C48mentioning

confidence: 98%

Galvanic Coupling Between Pure Copper and Pure Aluminum

Jorcin

Blanc

Pébère

et al. 2008

J. Electrochem. Soc.

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The corrosion behavior of a pure aluminum/pure copper couple in a weakly conductive sulfate solution was investigated. Potential and current distributions on the surface of the model couple at the beginning of immersion were obtained by solving the Laplace equation using a finite element method ͑FEM͒ algorithm. The potential distribution predicted by the calculations was checked using a Ag/AgCl microreference electrode. A good agreement was found between experimental and theoretical results. It was shown that the reaction occurring at the copper electrode was oxygen reduction, while aluminum remote from the Al/Cu interface remained in the passive state. Moreover, calculations predicted a large cathodic current, related to an increase in oxygen reduction, restricted to copper at the Al/Cu interface. This led to a local pH increase reaching values higher than 9, allowing the dissolution of aluminum to occur close to the interface. Combining these data with optical and scanning electron microscope observations after 24 h of immersion in the sodium sulfate solution allowed a three-step mechanism to be proposed to explain the corrosion damage, and particularly the presence of a copper deposit on the aluminum surface, some distance from the Al/Cu interface, a phenomenon currently observed in commercial copper-rich aluminum alloys.

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Section: C48mentioning

confidence: 98%