ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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The traditional methods for pickling stainless steels, titanium and nickel alloys may now be regarded as being surpassed as it is industrially possible to replace nitric acid, with less toxic substances. An environment friendly process has been developed based upon proprietary mixture named CLEANOX 352®, consisting mainly of HF together with inhibitors and wetting agents, properly stabilized H₂O₂ and H₂SO₄. Pickling mechanisms are centered on the concept of potentiostatic pickling of stainless steels developed by CSM during the 1970’s for sulphuric acid solutions. Process management limits reagent consumption and relevant operating costs without impairing the productivity of the production line or the surface quality of products due to problems of under or over pickling. The core of the process is an automated control system AT02 that has been developed to perform on-line analysis and to control the pickling process. The AT02 carries out chemical, electrical conductivity and potential analysis sending data to a computer that operates metering pumps and thus keeps the various quantities within preset limits. Industrial application in Italy include wire, tubes, bars and strips with excellent results in terms of surface quality, productivity and economy for materials ranging from 12%Cr, ferritic and austenitic stainless steels, soft and hard nickel alloys, commercial pure titanium.
Palavras-chave
Stainless stccls, Ni Alloys, Ti C.P. pickling. H2O2, H2SO4, controllcd potciitial
Como citar
Fortunati, Sa.; Pedrazzini, C..
ENVIRONMENT FRIENDLY PROCESS FOR PICKLING STAINLESS STEEL,
p. 5292-5299.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v11-289-296
