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1. WO2000033061 - DEVICE AND METHOD TO CONTROL STEEL PICKLING PROCESSES

Publication Number WO/2000/033061
Publication Date 08.06.2000
International Application No. PCT/EP1999/009367
International Filing Date 02.12.1999
Chapter 2 Demand Filed 28.06.2000
IPC
C23G 1/02 2006.01
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
1Cleaning or pickling metallic material with solutions or molten salts
02with acid solutions
G01N 27/06 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
02by investigating impedance
04by investigating resistance
06of a liquid
G01N 27/416 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26by investigating electrochemical variables; by using electrolysis or electrophoresis
416Systems
G01N 33/20 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
20Metals
CPC
C23G 1/02
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
1Cleaning or pickling metallic material with solutions or molten salts
02with acid solutions
Applicants
  • HENKEL KGaA [DE]/[DE] (AllExceptUS)
  • ACCIAI SPECIALI TERNI S.P.A. [IT]/[IT] (AllExceptUS)
  • GIORDANI, Paolo [IT]/[IT] (UsOnly)
  • MUSIANI, Fabio [IT]/[IT] (UsOnly)
  • DEMERTZIS, Ioannis [GR]/[IT] (UsOnly)
  • FORTUNATI, Sandro [IT]/[IT] (UsOnly)
  • MANCIA, Franco [IT]/[IT] (UsOnly)
  • NOVARO, Ezio [IT]/[IT] (UsOnly)
Inventors
  • GIORDANI, Paolo
  • MUSIANI, Fabio
  • DEMERTZIS, Ioannis
  • FORTUNATI, Sandro
  • MANCIA, Franco
  • NOVARO, Ezio
Agents
  • GERVASI, Gemma
Priority Data
MI98A00261202.12.1998IT
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DEVICE AND METHOD TO CONTROL STEEL PICKLING PROCESSES
(FR) DISPOSITIF ET PROCEDE DE CONTROLE DES PROCESSUS DE DECAPAGE DE L'ACIER
Abstract
(EN)
A device and a method to control pickling processes are described, where the control device comprises means (C) to take a sample of the bath to be analysed; means (CA, D, EM) to analyse said sample in order to measure a number of parameters according to specific conductivity and potentiometric methodologies as well as the redox potential value of said samples and its temperature; restoring means, apt to calculate, according to the above measured values, the quantity of corrective chemicals to be added to the pickling bath in order to restore at the desired level the value of said parameters and to actuate at least a device to add into said pickling bath necessary quantities of correction chemicals. The parameters measured according to conductivity methodologies are the concentrations of sulphuric acid, of hydrofluoric acid, or of another inorganic acid; the parameters measured according to potentiometric methodologies are concentrations of bivalent and trivalent iron ions and of hydrogen peroxide and the corrective chemicals are sulphuric acid, hydrofluoric agent and an oxidising agent.
(FR)
La présente invention concerne un dispositif et un procédé de contrôle des processus de décapage de l'acier. Ce dispositif de contrôle comprend un moyen (C) pour prélever un échantillon du bain pour analyse; des moyens (CA, D, EM) pour analyser cet échantillon en vue de mesurer un certain nombre de paramètres selon des méthodes de conductivité et de potentiométrie spécifiques, ainsi que la valeur du potentiel d'oxydo-réduction des échantillons et sa température; des moyens de restitution, pouvant calculer, en fonction des valeurs mesurées ci-dessus, la quantité de produits chimiques correcteurs devant être ajoutés au bain de décapage afin de restituer au niveau souhaité la valeur de ces paramètres, et d'actionner au moins un dispositif pour ajouter dans le bain de décapage les quantités nécessaires de produits chimiques correcteurs. Les paramètres mesurés en fonction des méthodes de conductivité sont les concentrations d'acide sulfurique, d'acide hydrofluorique, ou d'un autre acide inorganique; les paramètres mesurés en fonction des méthodes potentiométriques sont les concentrations d'ions ferreux bivalents ou trivalents et de peroxyde d'hydrogène; les produits chimiques correcteurs étant l'acide sulfurique, un agent hydrofluorique, et un agent d'oxydation.
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