Adhesive bond durability and corrosion resistance of AA6060-T6 flash-PEO treated in Mo-Si solutions.
- 1Department of Materials, University of Manchester, Manchester, UK.
- 2Henry Royce Institute, University of Manchester, Manchester, UK.
- 3BCW Treatments Ltd, Burnley, UK.
Abstract
Aluminium adhesive bonding is a key enabler in lightweighting engineering structures, directly influencing global energy consumption and carbon emissions. Plasma electrolytic oxidation (PEO) has recently emerged as an environmentally friendly alternative to industry-standard sulphuric acid anodising (SAA) surface preparation prior to bonding. However, little is known about the longer-term durability of adhesively bonded PEO-treated structures. Here, AA6060-T6 Al alloy samples were subjected to unconventionally brief 70-s flash-PEO treatments using high-frequency 2.5 kHz unipolar and bipolar pulsed polarisation in aqueous alkaline electrolytes containing Na2SiO3 and optionally Na2MoO4. Molybdate addition and bipolar polarisation improved uniformity and corrosion resistance of thin, ~1 μm, oxide layers produced. All studied flash-PEO coatings performed well in lap shear tests, exhibiting adhesive strength comparable to that of sealed SAA films and demonstrated equivalent or enhanced bond durability when tested after 1008-h Sea Water Acetic Acid Test exposure, indicating satisfactory resistance to moisture and corrosion with preferential adhesive fracture. Comparable to SAA, the long-term bonding performance of flash-PEO treatments highlights their potential as a sustainable surface preparation route for aluminium adhesive bonding.
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BibTeX
@article{shore2026adhesive,
title = {{Adhesive bond durability and corrosion resistance of AA6060-T6 flash-PEO treated in Mo-Si solutions.}},
author = {Dominic Shore and Junia C Avelar-Batista Wilson and Nicolas Laugel and Allan Matthews and Aleksey Yerokhin},
journal = {Npj Materials degradation},
year = {2026},
month = jul,
doi = {10.1038/s41529-026-00841-5},
url = {https://europepmc.org/article/MED/42996302},
note = {CC BY},
}
RIS
TY - JOUR
TI - Adhesive bond durability and corrosion resistance of AA6060-T6 flash-PEO treated in Mo-Si solutions.
AU - Dominic Shore
AU - Junia C Avelar-Batista Wilson
AU - Nicolas Laugel
AU - Allan Matthews
AU - Aleksey Yerokhin
PY - 2026
DA - 2026/07/15
JO - Npj Materials degradation
DO - 10.1038/s41529-026-00841-5
UR - https://europepmc.org/article/MED/42996302
AB - Aluminium adhesive bonding is a key enabler in lightweighting engineering structures, directly influencing global energy consumption and carbon emissions. Plasma electrolytic oxidation (PEO) has recently emerged as an environmentally friendly alternative to industry-standard sulphuric acid anodising (SAA) surface preparation prior to bonding. However, little is known about the longer-term durability of adhesively bonded PEO-treated structures. Here, AA6060-T6 Al alloy samples were subjected to unconventionally brief 70-s flash-PEO treatments using high-frequency 2.5 kHz unipolar and bipolar pulsed polarisation in aqueous alkaline electrolytes containing Na2SiO3 and optionally Na2MoO4. Molybdate addition and bipolar polarisation improved uniformity and corrosion resistance of thin, ~1 μm, oxide layers produced. All studied flash-PEO coatings performed well in lap shear tests, exhibiting adhesive strength comparable to that of sealed SAA films and demonstrated equivalent or enhanced bond durability when tested after 1008-h Sea Water Acetic Acid Test exposure, indicating satisfactory resistance to moisture and corrosion with preferential adhesive fracture. Comparable to SAA, the long-term bonding performance of flash-PEO treatments highlights their potential as a sustainable surface preparation route for aluminium adhesive bonding.
SN - 2397-2106
ER -