Surface pretreatment of austenitic stainless steel and copper by chemical, plasma electrolytic or CO2 cryoblasting techniques for sol-gel coating

Raisa Niemi (Corresponding Author), Amar Mahiout, Jarmo Siivinen, Riitta Mahlberg, Jari Likonen, Juha Nikkola, Juha Mannila, T. Vuorio, L.-S. Johansson, O. Söderberg, Simo-Pekka Hannula

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The surface pretreatments of the austenitic stainless steel and copper surfaces for the sol–gel coating were carried out by chemical, plasma electrolytic or CO2 cryoblasting techniques. With the austenitic stainless steel the smoothest surfaces were obtained with plasma electrolytic cleaning, after which the measured contact angles of water were clearly decreased revealing improved hydrophilicity. As well with the copper samples the smooth surface and improved hydrophilicity was obtained with the plasma electrolytic cleaning, but oxide layer formed to the copper surface immediately after the treatment. CO2 cryoblasting provided rough surface with wetting properties close to the original surface both for austenitic stainless steel and copper surfaces. CO2 cryoblasting provided best appearance for the copper surface because no oxidation happened with that treatment. XPS and SIMS studies showed that with the plasma electrolytic treatment the surface layer of the austenitic stainless steel enriched of chromium and the oxide layer formed on the surface was less than 10 nm thick. With the chemical cleaning and CO2 cryoblasting, the chromium enrichment to the stainless steel surface was less. However XPS and SIMS studies showed that chemical treatment provided thinner oxide layer to copper surface than plasma electrolytic treatment.
Original languageEnglish
Pages (from-to)2424-2431
Number of pages8
JournalSurface and Coatings Technology
Volume204
Issue number15
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • CO2 cryoblasting
  • Pickling
  • Plasma electrolytic
  • Secondary ion mass spectrometry (SIMS)
  • X-ray photoelectron spectroscopy (XPS)

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