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Optimized Pulsed Anodization for Corrosion Protection of Aluminum Silicon Alloys

Product Number: 51321-16431-SG
Author: Marco Bandiera/Arianna Pavesi/Massimiliano Bestetti/Alessandro Mancini/Andrea Bonfanti/Federico Bertasi
Publication Date: 2021
$0.00
$20.00
$20.00

The manuscript investigates new waveforms for pulsed anodization of Aluminum Silicon alloys (AlSix) and demonstrates: 1) an effective reduction of the anodic layers porosity degree; 2) an enhancement of the thickness homogeneity; and 3) a boost of the corrosion protection capability; of the obtained coatings. The interplay between process parameters (e.g. current/potential waveforms), oxide layer morphology and corrosion resistance is investigated by means of several techniques.In particular, metallography, voltammetry and contact angle methods are used in order to correlate the electrochemical figures of merit (corrosion potential, corrosion current, breakdown potential and polarization resistance) with the layer morphological features. It is concluded that the careful optimization of the anodization process can lead to the development of oxide layers with an enhanced corrosion resistance. In particular, the following level of performance on anodized AlSi7 is achieved: corrosion potential (Ecorr) = -285mV vs. SCE, corrosion current (Icorr) = 0.08nA∙cm-2, breakdown potential (Ebp) = +778mV vs. SCE and polarization resistance (Rp) = 215MOhm∙cm-2.

Key words: Aluminum-Silicon Alloy, Pulsed Anodization, Brake Caliper, Corrosion Protection, Anodic Layer.

The manuscript investigates new waveforms for pulsed anodization of Aluminum Silicon alloys (AlSix) and demonstrates: 1) an effective reduction of the anodic layers porosity degree; 2) an enhancement of the thickness homogeneity; and 3) a boost of the corrosion protection capability; of the obtained coatings. The interplay between process parameters (e.g. current/potential waveforms), oxide layer morphology and corrosion resistance is investigated by means of several techniques.In particular, metallography, voltammetry and contact angle methods are used in order to correlate the electrochemical figures of merit (corrosion potential, corrosion current, breakdown potential and polarization resistance) with the layer morphological features. It is concluded that the careful optimization of the anodization process can lead to the development of oxide layers with an enhanced corrosion resistance. In particular, the following level of performance on anodized AlSi7 is achieved: corrosion potential (Ecorr) = -285mV vs. SCE, corrosion current (Icorr) = 0.08nA∙cm-2, breakdown potential (Ebp) = +778mV vs. SCE and polarization resistance (Rp) = 215MOhm∙cm-2.

Key words: Aluminum-Silicon Alloy, Pulsed Anodization, Brake Caliper, Corrosion Protection, Anodic Layer.

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