Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities

Miaomiao Cui; Demian I. Njoku; Bowen Li; Lihui Yang; Zuankai Wang; Baorong Hou; Ying Li

doi:10.1016/j.corcom.2021.06.001

Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities

Miaomiao Cui, Demian I. Njoku, Bowen Li, Lihui Yang, Zuankai Wang, Baorong Hou, Ying Li

Research output: Journal article publication › Journal article › Academic research › peer-review

31 Citations (Scopus)

Abstract

This article employed a layer-by-layer approach to modify the interfacial boundary of halloysite clay nanotubes (HNTs) using (poly (diallyldimethylammonium chloride)) (PDDA) and poly (styrene sulfonate) (PSS) polyelectrolytes to form core (inhibitor-loaded HNTs)-shell (polyelectrolytes layers (PDDA/PSS)) structured smart microcapsules or micro-containers. Responses of the smart microcapsules to changes in pH (H⁺), Cl⁻, OH⁻ and H₂O during the release of the loaded inhibitor (2-mecaptobenzothiazole inhibitor (2-MBT)) coupled with the number of PDDA/PSS polyelectrolytes layers (n) required to obtain optimal response were characterized. The anticorrosion efficacies of several organic compounds were screened to identify the most suitable inhibitor for the protection of Al alloy 2024 in 3.5 wt.% NaCl. 2-MBT which exhibits the best inhibition efficiency was successfully loaded into the HNTs lumen as demonstrated by TGA and DSC results. The release profiles of 2-MBT reveal that the sensitivity of the smart microcapsules to the various external stimuli decreased in the following order: pH > Cl⁻ > H₂O > OH⁻; and three-layered polyelectrolyte (3n) displays the highest sensitivity amongst the studied layer numbers (n). The release profiles were fitted to the Pappas and Weibull's models which describe the release mechanisms. Compatibility of the smart microcapsules with epoxy coating coupled with the anticorrosion effect on Al alloy 2024 substrate were evaluated by means of long-term salt spray and immersion tests.

Original language	English
Pages (from-to)	1-9
Number of pages	9
Journal	Corrosion Communications
Volume	1
DOIs	https://doi.org/10.1016/j.corcom.2021.06.001
Publication status	Published - Mar 2021
Externally published	Yes

Keywords

Inhibitor
Microcapsule
Smart anticorrosive coating
Sustained release

ASJC Scopus subject areas

Metals and Alloys

More information

10.1016/j.corcom.2021.06.001

Cite this

@article{e4844ac35bba4d128a53e708f375c324,

title = "Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities",

abstract = "This article employed a layer-by-layer approach to modify the interfacial boundary of halloysite clay nanotubes (HNTs) using (poly (diallyldimethylammonium chloride)) (PDDA) and poly (styrene sulfonate) (PSS) polyelectrolytes to form core (inhibitor-loaded HNTs)-shell (polyelectrolytes layers (PDDA/PSS)) structured smart microcapsules or micro-containers. Responses of the smart microcapsules to changes in pH (H+), Cl−, OH− and H2O during the release of the loaded inhibitor (2-mecaptobenzothiazole inhibitor (2-MBT)) coupled with the number of PDDA/PSS polyelectrolytes layers (n) required to obtain optimal response were characterized. The anticorrosion efficacies of several organic compounds were screened to identify the most suitable inhibitor for the protection of Al alloy 2024 in 3.5 wt.% NaCl. 2-MBT which exhibits the best inhibition efficiency was successfully loaded into the HNTs lumen as demonstrated by TGA and DSC results. The release profiles of 2-MBT reveal that the sensitivity of the smart microcapsules to the various external stimuli decreased in the following order: pH > Cl− > H2O > OH−; and three-layered polyelectrolyte (3n) displays the highest sensitivity amongst the studied layer numbers (n). The release profiles were fitted to the Pappas and Weibull's models which describe the release mechanisms. Compatibility of the smart microcapsules with epoxy coating coupled with the anticorrosion effect on Al alloy 2024 substrate were evaluated by means of long-term salt spray and immersion tests.",

keywords = "Inhibitor, Microcapsule, Smart anticorrosive coating, Sustained release",

author = "Miaomiao Cui and Njoku, {Demian I.} and Bowen Li and Lihui Yang and Zuankai Wang and Baorong Hou and Ying Li",

note = "Funding Information: Y. Li and D.I. Njoku acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 51871227 and 51671198). Z.K. Wang is grateful for financial support from the Shenzhen Science and Technology Innovation Council (No. JCYJ20170413141208098), the Innovation Technology Fund (No. 9440175), the Research Grants Council of Hong Kong (Nos. C1018-17G and 11275216) and the City University of Hong Kong (Nos. 9360140 and 9667139). Publisher Copyright: {\textcopyright} 2021",

year = "2021",

month = mar,

doi = "10.1016/j.corcom.2021.06.001",

language = "English",

volume = "1",

pages = "1--9",

journal = "Corrosion Communications",

issn = "1002-6495",

publisher = "Elsevier B.V.",

}

Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities. / Cui, Miaomiao; Njoku, Demian I.; Li, Bowen et al.
In: Corrosion Communications, Vol. 1, 03.2021, p. 1-9.

Research output: Journal article publication › Journal article › Academic research › peer-review

TY - JOUR

T1 - Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities

AU - Cui, Miaomiao

AU - Njoku, Demian I.

AU - Li, Bowen

AU - Yang, Lihui

AU - Wang, Zuankai

AU - Hou, Baorong

AU - Li, Ying

N1 - Funding Information: Y. Li and D.I. Njoku acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 51871227 and 51671198). Z.K. Wang is grateful for financial support from the Shenzhen Science and Technology Innovation Council (No. JCYJ20170413141208098), the Innovation Technology Fund (No. 9440175), the Research Grants Council of Hong Kong (Nos. C1018-17G and 11275216) and the City University of Hong Kong (Nos. 9360140 and 9667139). Publisher Copyright: © 2021

PY - 2021/3

Y1 - 2021/3

N2 - This article employed a layer-by-layer approach to modify the interfacial boundary of halloysite clay nanotubes (HNTs) using (poly (diallyldimethylammonium chloride)) (PDDA) and poly (styrene sulfonate) (PSS) polyelectrolytes to form core (inhibitor-loaded HNTs)-shell (polyelectrolytes layers (PDDA/PSS)) structured smart microcapsules or micro-containers. Responses of the smart microcapsules to changes in pH (H+), Cl−, OH− and H2O during the release of the loaded inhibitor (2-mecaptobenzothiazole inhibitor (2-MBT)) coupled with the number of PDDA/PSS polyelectrolytes layers (n) required to obtain optimal response were characterized. The anticorrosion efficacies of several organic compounds were screened to identify the most suitable inhibitor for the protection of Al alloy 2024 in 3.5 wt.% NaCl. 2-MBT which exhibits the best inhibition efficiency was successfully loaded into the HNTs lumen as demonstrated by TGA and DSC results. The release profiles of 2-MBT reveal that the sensitivity of the smart microcapsules to the various external stimuli decreased in the following order: pH > Cl− > H2O > OH−; and three-layered polyelectrolyte (3n) displays the highest sensitivity amongst the studied layer numbers (n). The release profiles were fitted to the Pappas and Weibull's models which describe the release mechanisms. Compatibility of the smart microcapsules with epoxy coating coupled with the anticorrosion effect on Al alloy 2024 substrate were evaluated by means of long-term salt spray and immersion tests.

AB - This article employed a layer-by-layer approach to modify the interfacial boundary of halloysite clay nanotubes (HNTs) using (poly (diallyldimethylammonium chloride)) (PDDA) and poly (styrene sulfonate) (PSS) polyelectrolytes to form core (inhibitor-loaded HNTs)-shell (polyelectrolytes layers (PDDA/PSS)) structured smart microcapsules or micro-containers. Responses of the smart microcapsules to changes in pH (H+), Cl−, OH− and H2O during the release of the loaded inhibitor (2-mecaptobenzothiazole inhibitor (2-MBT)) coupled with the number of PDDA/PSS polyelectrolytes layers (n) required to obtain optimal response were characterized. The anticorrosion efficacies of several organic compounds were screened to identify the most suitable inhibitor for the protection of Al alloy 2024 in 3.5 wt.% NaCl. 2-MBT which exhibits the best inhibition efficiency was successfully loaded into the HNTs lumen as demonstrated by TGA and DSC results. The release profiles of 2-MBT reveal that the sensitivity of the smart microcapsules to the various external stimuli decreased in the following order: pH > Cl− > H2O > OH−; and three-layered polyelectrolyte (3n) displays the highest sensitivity amongst the studied layer numbers (n). The release profiles were fitted to the Pappas and Weibull's models which describe the release mechanisms. Compatibility of the smart microcapsules with epoxy coating coupled with the anticorrosion effect on Al alloy 2024 substrate were evaluated by means of long-term salt spray and immersion tests.

KW - Inhibitor

KW - Microcapsule

KW - Smart anticorrosive coating

KW - Sustained release

UR - http://www.scopus.com/inward/record.url?scp=85116028245&partnerID=8YFLogxK

U2 - 10.1016/j.corcom.2021.06.001

DO - 10.1016/j.corcom.2021.06.001

M3 - Journal article

AN - SCOPUS:85116028245

SN - 1002-6495

VL - 1

SP - 1

EP - 9

JO - Corrosion Communications

JF - Corrosion Communications

ER -

Corrosion protection of Aluminium Alloy 2024 through an epoxy coating embedded with smart microcapsules: The responses of smart microcapsules to corrosive entities

Abstract

Keywords

ASJC Scopus subject areas

More information

Other files and links

Fingerprint

Cite this