Smart anti-corrosive self-healing coatings using halloysite nanotubes as host for entrapment of corrosion inhibitors

Karan Thanawala, Anand Sawroop Khanna, R. K.Singh Raman, Siva Bohm

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)

Abstract

An attempt was made to develop thin film self-healing coatings doped with halloysite nanotubes as host to entrap corrosion inhibitor (benzotriazole); that has an ability to release in a controlled way. The halloysite nanotubes are naturally available alumino-silicate hollow cylinders having 15 nm lumen diameter and 0.5-1.0 micron length. The corrosion inhibitors were loaded into the hollow lumens of halloysite (in acetone medium), which enables higher loading and sustainable release of inhibitor, due to its high aspect ratio. The inhibitor-loaded halloysite nanotubes were doped in the epoxy-silane coating at different loading levels. The ability of these nanotubes to release the corrosion inhibitors as and when required suppressed the anodic activity, thereby preventing the coating from further damage, and restricting the corrosion process. The smart self-healing anticorrosion performance of the epoxy-silane coating loaded with varying amount of halloysite entrapped benzotriazole was investigated on the mild steel substrate by direct exposure to corrosive media. The kinetics of the corrosion protection of the coating at the coating defect was analyzed by scanning vibrating electrode technique (SVET) and electrochemical impedance spectroscopy (EIS). The results confirmed the considerable improvement in the corrosion resistance due to the release of inhibitor from the doped halloysite.
Original languageEnglish
Title of host publicationAustralasian Corrosion Association Annual Conference: Corrosion and Prevention 2015, ACA 2015
Subtitle of host publicationAdelaide, Australia; 15-18 November 2015
Place of PublicationKerrimuir VIC Australia
PublisherAustralasian Corrosion Association (ACA)
Pages1-7
Number of pages7
ISBN (Print)9781510822573
Publication statusPublished - 1 Jan 2015
EventAustralasian Corrosion Association (ACA) Conference 2015: Corrosion and Prevention - Adelaide Convention Centre, Adelaide, Australia
Duration: 15 Nov 201518 Nov 2015
https://web.archive.org/web/20150226195929/http://acaconference.com.au/home

Conference

ConferenceAustralasian Corrosion Association (ACA) Conference 2015
Abbreviated titleACA 2015
CountryAustralia
CityAdelaide
Period15/11/1518/11/15
Internet address

Keywords

  • Anti-corrosion coatings
  • Benzotriazole inhibitor
  • Halloysite nanotubes
  • Self-healing coatings

Cite this

Thanawala, K., Khanna, A. S., Raman, R. K. S., & Bohm, S. (2015). Smart anti-corrosive self-healing coatings using halloysite nanotubes as host for entrapment of corrosion inhibitors. In Australasian Corrosion Association Annual Conference: Corrosion and Prevention 2015, ACA 2015: Adelaide, Australia; 15-18 November 2015 (pp. 1-7). [017] Australasian Corrosion Association (ACA).