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Polypyrrole coatings on rheocast aluminum-silicon alloy: A correlation between properties and electrodeposition conditions
Univ Trento, Dept Ind Engn, Trento, Italy.
FBK, Ctr Mat & Microsyst, Trento, Italy.
Univ Trento, Dept Ind Engn, Trento, Italy.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2924-137X
2019 (English)In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918Article in journal (Refereed) Epub ahead of print
Abstract [en]

The effect of the electrolyte composition and the deposition potential range on the physical properties and possible corrosion protection effect of polypyrrole coatings on rheocast aluminum–2.5 % silicon alloy is investigated. Solutions with different concentrations of sodium nitrate and an electron transfer mediator reagent were used for the electrodeposition. Polypyrrole coating is able to hinder the entrance of electrolyte. Upon the penetration of chloride ions, the coating can induce passivation of the alloy's surface by its reduction. The thickness of the coating and its ion-barrier properties, controlled by the electrodeposition conditions, are shown as the important factors influencing the protection efficiency. However, localized drastic galvanic coupling at the polypyrrole/aluminum interface forms blisters, causes failure, and limits the possible protection.

Place, publisher, year, edition, pages
2019.
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:hj:diva-46927DOI: 10.1002/sia.6709ISI: 000495498600001Scopus ID: 2-s2.0-85075059618Local ID: PP JTH 2019 embargo 12;JTHMaterialISOAI: oai:DiVA.org:hj-46927DiVA, id: diva2:1373834
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-12-02

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The full text will be freely available from 2020-11-11 00:00
Available from 2020-11-11 00:00

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Zanella, Caterina

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