Abstract:
Methods and systems are provided for treating oxide scale on the surface of a metal object. In one embodiment, a system temperature control apparatus controls the temperature of metal object's surface to an application temperature below the Leidenfrost temperature point of an alkali metal hydroxide aqueous conditioning solution. An application apparatus wets the metal object's surface at the controlled temperature with a thin layer of the solution that engages the oxide scale, and a heating apparatus heats the wetted surface to a final conditioning temperature above a melting point of the alkali metal hydroxide by an additional value selected to effect conditioning of the oxide scale at a reasonable but not excessive rate by the melting alkali metal hydroxide reacting with the oxide scale. The system terminates additional conditioning to prevent creation of additional oxide scale beyond the conditioned depth.
Abstract:
The invention relates to a method for cleaning a metal strip (1). In order to improve cleaning of the strip, the metal strip (1) is initially subjected to a first high-pressure cleaning process (4) by means of at least one liquid jet in a first section (2) of a cleaning device (3), whereupon the metal strip (1) is subjected to an ultrasonic cleaning process (6) in a second section (5) of the cleaning device (3), the metal strip (1) being guided through a receptacle that is filled with a liquid in said ultrasonic cleaning process. The invention further relates to a device for cleaning a metal strip.
Abstract:
The present invention relates to a process for pickling hot rolled, hot rolled & annealed, and cold rolled & annealed stainless steel strip in a continuous fashion. The process comprises a series of pre-pickling tanks and pickling tanks, and optionally includes a scrubber-brush tank, a de-smutting tank, a filtration unit and a heat exchanger. The process includes a HF/U2SO4 pre-pickle and a UF/U2SO4/U2O2 pickling step.
Abstract:
This invention provides methods and apparatuses which can manufacture Si-containing cold rolled steel sheets exhibiting excellent chemical conversion properties even if a chemical conversion treatment solution is used at a lower temperature while minimally suppressing the generation of sludge as well as reducing running costs. The method includes steps of cold rolling a steel containing 0.5 to 3.0 mass% Si, continuously annealing the cold rolled steel sheet, pickling the surface of the continuously annealed cold rolled steel sheet, and repickling the surface of the pickled steel sheet with a non-oxidative acid. The repickling is performed such that a repickling solution is sampled continuously or periodically, an acid concentration in the sampled solution is measured, and the acid concentration in the repickling solution is regularly controlled within a prescribed concentration range.
Abstract:
The invention relates to a method for pickling hot-rolled silicon-steel strips (4) continuously moving in at least one pickling tank (20, 21, 22) containing a pickling solution (30, 31, 32). According to the invention, the pickling method comprises processing the silica formed in the pickling solution (30, 31, 32) using continuous filtration. The invention also relates to pickling equipment for implementing said method.
Abstract:
Methods for deoxidizing metallic surfaces are disclosed. Such a method may include contacting a surface of a metal strip (102) with one or more chemical solutions until a potential drop across a thickness of the metal strip (102) is less than a pre-selected value. To process a metal strip (102) such that it may be suitable for fabrication of a bipolar plate for use in a fuel cell, the metal strip (102) may be processed until the potential drop is less than about 15 mV. A surface of the metal strip (102) may be contacted for a first period of time with a first chemical solution having a pH of between 10 and 14. Thereafter, the surface may be contacted for a second period of time with a second chemical solution having a pH of between 1 and 3. A conductive organic coating may then be applied to the surface. Such methods are particularly suitable for use in connection with a coil coating process.
Abstract:
Methods for deoxidizing metallic surfaces are disclosed. Such a method may include contacting a surface of a metal strip (102) with one or more chemical solutions until a potential drop across a thickness of the metal strip (102) is less than a pre-selected value. To process a metal strip (102) such that it may be suitable for fabrication of a bipolar plate for use in a fuel cell, the metal strip (102) may be processed until the potential drop is less than about 15 mV. A surface of the metal strip (102) may be contacted for a first period of time with a first chemical solution having a pH of between 10 and 14. Thereafter, the surface may be contacted for a second period of time with a second chemical solution having a pH of between 1 and 3. A conductive organic coating may then be applied to the surface. Such methods are particularly suitable for use in connection with a coil coating process.
Abstract:
Ein Verfahren und eine Vorrichtung zur automatischen Zundererkennung auf Oberflächen (1a) von metallischem Bandgut (1), insbesondere von warmgewalztem Stahlband oder Edelstahlband, arbeitet über eine optische Beobachtung der Bewegten Bandoberfläche (1a). Um vor der Behandlung des Metallbandes im Beizbekken präventive Maßnahmen zu ermöglichen und dabei die optischen Messwerte für die Behandlung des Metallbandes einzusetzen, wird vorgeschlagen, dass durch optisches Abtasten der Bandoberfläche (1a) Verzunderungsmuster aufgenommen und digitalisiert werden und dass das digitalisierte Verzunderungsmuster aufgrund eines Vergleichs mit einem gespeicherten digitalen Master-Muster als Steuerungssignal für angeschlossene Einrichtungen zum Behandeln des Bandgutes (1) eingesetzt wird.