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Surface Analysis of 316 Stainless Steel Treated with Cold Atmospheric Plasma

Williams, DF, Kellar, EJC, Jesson, David and Watts, John (2017) Surface Analysis of 316 Stainless Steel Treated with Cold Atmospheric Plasma Applied Surface Science, 403. pp. 240-247.

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The surface of 316 stainless steel has been modified using cold atmospheric plasma (CAP) to increase the surface free energy (by cleaning the and chemically activating the surface)IN preparation for subsequent processes such as painting, coating or adhesive bonding. The analyses carried out, on CAP treated 316 stainless steel surfaces, includes X-ray photoelectron spectroscopy (XPS), imaging XPS (iXPS), and surface free energy (SFE) analysis using contact angle measurements.The CAP treatment is shown to increase the SFE of as-received 316 stainless steel from ~39 mJ m-1 to >72 mJ m-1 after a short exposure to the plasma torch. This was found to correlate to a reduction in adventitious carbon, as determined by XPS analysis of the surface. The reduction from ~90 at% to ~30% and ~39 at%, after being plasma treated for 5 minutes and 15 seconds respectively, shows that the process is relatively quick at changing the surface. It is suggested that the mechanism that causes the increase in surface free energy is chain scission of the hydrocarbon contamination triggered by free electrons in the plasma plume followed by chemical functionalisation of the metal oxide surface and some of the remaining carbon contamination layer.

Item Type: Article
Subjects : Mechanical Engineering Science
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Date : 19 January 2017
Funders : EPSRC
Identification Number : 10.1016/j.apsusc.2017.01.150
Copyright Disclaimer : © 2017 The Author(s). Published Under a CC-BY Creative Commons license
Depositing User : Symplectic Elements
Date Deposited : 24 Jan 2017 12:44
Last Modified : 19 Jul 2017 09:09

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