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Combinatorial electrochemistry on Al-Fe alloys.

Andrei Ionut Mardare¹, Amar Prasad Yadav¹, Andreas Dirk Wieck²

¹Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany.

Science and Technology of Advanced Materials

|November 24, 2016

Summary

High throughput microelectrochemistry reveals synergistic effects in aluminum-iron alloys. A narrow composition range of 9-12 at.% Fe significantly enhances oxide formation onset potential.

Keywords:

anodic oxide film combinatorial libraries microelectrochemistry scanning droplet cell

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Area of Science:

Materials Science
Electrochemistry
Surface Chemistry

Background:

Aluminum-rich aluminum-iron (Al-Fe) alloys are crucial in various industrial applications.
Understanding their interface chemistry is vital for optimizing material performance and preventing corrosion.
Combinatorial approaches offer efficient methods for exploring complex material systems.

Purpose of the Study:

To investigate the interface chemistry of Al-Fe alloys across a range of compositions.
To quantitatively determine key electrochemical properties as a function of alloy composition.
To identify and explain any synergistic effects influencing oxide formation.

Main Methods:

Combinatorial material development using composition spread thin films with linear composition gradients.
High-throughput microelectrochemistry, including scanning droplet cell (SDC) measurements.
Anodic oxide formation with intermittent electrochemical impedance spectroscopy (EIS).
X-ray photoelectron spectroscopy (XPS) for composition and depth profiling.

Main Results:

Quantitative determination of film formation factor, relative permittivity, and oxide formation onset potential with 0.5 at.% resolution.
Discovery of an unexpected synergistic effect in Al-Fe alloys between 9 and 12 at.% Fe.
A significant shift in the onset potential (nearly 1 V) was observed within this narrow composition range.
XPS analysis supported the findings, indicating local iron accumulation and its role.

Conclusions:

A synergistic effect in Al-Fe alloys within a specific composition range (9-12 at.% Fe) dramatically influences oxide formation.
This effect is attributed to local iron accumulation, leading to redox stabilization of space charge layer formation during high-field oxide growth.
The study demonstrates the power of combining combinatorial material development with high-throughput microelectrochemistry for efficient materials investigation.