Aluminum surface treatment by the RF plasma pencil

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Authors

PRYSIAZHNYI Vadym SVOBODA Tomáš KLÍMA Miloš DVOŘÁK Milan

Year of publication 2012
Type Article in Periodical
Magazine / Source Surface and Coatings Technology
MU Faculty or unit

Faculty of Science

Citation
Web full text of article
Doi http://dx.doi.org/10.1016/j.surfcoat.2012.04.010
Field Corrosion and surface processing of materials
Keywords Aluminum; Plasma pencil; Plasma oxidation; Ar/O2 plasma
Description The effects of atmospheric RF plasma treatment on aluminum sheets were studied. The treatment was performed with the plasma pencil developed at Masaryk University, using Ar and Ar/O2 gas mixtures. The surface free energy of treated sheets increased up to 72.6 mJ/m2, which later resulted into higher adhesion between the STEEL industrial protective varnish and the plasma treated aluminum sheets. The adhesion properties were tested by ISO-certified Erichsen and bending tests. A set of IR spectroscopy measurements in ATR mode proved significant plasma surface cleaning, generation of OH groups and surface oxidation. The addition of O2 into the Ar flow resulted in stronger oxidation of aluminum, which was measured by the EDX technique. The surface of aluminum sheets became porous after the plasma treatment with Ar. The smoothening of pores occurred after adding a small amount of O2 into the Ar flow.
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