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Electrochemical performance of polypyrrole coatings electrodeposited on rheocast aluminum-silicon components
Department of Industrial Engineering, University of Trento, Trento, Italy.
Department of Industrial Engineering, University of Trento, Trento, Italy.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2924-137X
2019 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 137, article id 105307Article in journal (Refereed) Epub ahead of print
Abstract [en]

Electropolymerization of polypyrrole coatings in the presence and absence of sodium nitrate was applied on rheo-cast Al-4.5% Si alloy and pure aluminum. The results showed that the eutectic silicon phase and intermetallic particles in the alloy's microstructure increase the electrodeposition rate in comparison to the pure aluminum substrate. The electrochemical and microstructural studies show that the polypyrrole coatings are able to protect the surface due to the barrier properties and the passivation protection provided by the reduction of the conductive polymer. The coating electrodeposited from sodium nitrate-containing electrolyte presented improved protection for longer immersion time. Localized formation of a thick oxide layer as a result of the drastic galvanic coupling at the polypyrrole/aluminum interface leads to blister formation and failure of the coating. It was revealed that the coating could be deposited into the porosities produced by the casting related defects, but in most cases, this affects the corrosion protection leading to imminent failure.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 137, article id 105307
Keywords [en]
Al-Si alloy, Casting defect, Corrosion protection, Galvanic coupling, Polypyrrole, Aluminum coatings, Aluminum corrosion, Corrosion resistant coatings, Electrodeposition, Electrodes, Electrolytes, Electropolymerization, Galvanic corrosion, Nitrates, Polypyrroles, Silicon alloys, Sodium nitrate, Barrier properties, Conductive Polymer, Electrochemical performance, Inter-metallic particle, Polypyrrole coatings, Aluminum alloys
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:hj:diva-46215DOI: 10.1016/j.porgcoat.2019.105307Scopus ID: 2-s2.0-85072036968Local ID: ;JTHMaterialISOAI: oai:DiVA.org:hj-46215DiVA, id: diva2:1352099
Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-09-17

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