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Knjižnica IMT
  • Comparison of chemical and plasma removal of oxide scale from duplex stainless steel
    Donik, Črtomir ...
    A tightly adhering oxide scale is formed on all types of stainless steels when they are annealed. The removal of the oxide scale and chromium-depleted under layer is one of the most important ... processes during the stainless steel production. Their removal of oxide scale from duplex stainless steel has shown to be even more difficult than normal austenitic or ferritic stainless steels. While it is well known that electrolytic pickling in neutral sodium sulphate is widely used for oxide scale removal the amount of energy and the composition of the container is quite complex so we tried another approach with reductive plasma in comparison with simple chemical scale removal. This study describes the different stages of the oxide scale removal on duplex stainless steel DSS 2205 in HNO3/HF mixtures and removal by reductive plasma. The dissolution is proposed to proceed by the chemical reactions of the scale in successive stages. At the beginning of the pickling process chromium and manganese of the outer oxide layer were preferentially dissolved. When the chromium content of the outer layer decreased, the scqale and oxide/metal interface was enriched of iron. The comparison of elemental composition of the residue oxide layer on the top has been investigated by surface sensitive techniques XPS and AES.
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2010
    Jezik - slovenski, angleški
    COBISS.SI-ID - 828074