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Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials
- Source :
- Materials 13(3), 799 (2020), Helvia. Repositorio Institucional de la Universidad de Córdoba, instname, Materials, Volume 13, Issue 3, Materials, Vol 13, Iss 3, p 799 (2020)
- Publication Year :
- 2020
- Publisher :
- MDPI, 2020.
-
Abstract
- Polytetrafluoroethylene (PTFE) coatings are used in many applications and processing industries. With their use, they wear out and lose properties and must be replaced by new ones if the cost of the element so advises. There are different stripping techniques, but almost all of them are very difficult and require strict environmental controls. It is a challenge to approach the process through efficient and more sustainable techniques. In the present work, we have studied the stripping of PTFE coatings by projection with abrasives (1 step) as an alternative to carbonization + sandblasting procedures (2 steps). For this purpose, different types of abrasives have been selected: brown corundum, white corundum, glass microspheres, plastic particles, and a walnut shell. The tests were performed at pressures from 0.4 to 0.6 MPa on PTFE-coated aluminium substrates of EN AW-5182 H111 alloy. Stripping rates, surface roughness, and substrate hardness have been studied. Scanning electron microscopy (SEM) images of sandblasted specimens have also been obtained. All abrasives improved mechanical and surface properties in one-step vs. two-step processes. The abrasives of plastic and glass microspheres are the most appropriate for the one-step process, which increases the hardness and roughness level Ra in the substrate. Corundum abrasives enable the highest stripping rates.
- Subjects :
- 0209 industrial biotechnology
Materials science
PTFE coating
corundum
Scanning electron microscope
Corundum
chemistry.chemical_element
02 engineering and technology
Surface finish
walnut shell
engineering.material
Stripping (fiber)
lcsh:Technology
Article
020901 industrial engineering & automation
Aluminium
Glass microspheres
Surface roughness
General Materials Science
Composite material
lcsh:Microscopy
lcsh:QC120-168.85
plastic particles
lcsh:QH201-278.5
lcsh:T
Abrasive
Fluoropolymer coating
stripping
fluoropolymer coating
021001 nanoscience & nanotechnology
Abrasives
Glass microsphere
abrasives
chemistry
lcsh:TA1-2040
engineering
lcsh:Descriptive and experimental mechanics
glass microspheres
lcsh:Electrical engineering. Electronics. Nuclear engineering
Plastic particles
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
Stripping
lcsh:TK1-9971
Walnut shell
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Materials 13(3), 799 (2020), Helvia. Repositorio Institucional de la Universidad de Córdoba, instname, Materials, Volume 13, Issue 3, Materials, Vol 13, Iss 3, p 799 (2020)
- Accession number :
- edsair.doi.dedup.....e793dfc9dfd7117c3bf5d74df4e4b862