Patents Assigned to Novamax ITB s.r.l.
  • Process for stainless steel pickling and passivation without using nitric acid
    Patent number: 6068001
    Abstract: Process for stainless steel pickling consisting in placing the material to be treated in a bath kept at a temperature ranging from 30.degree. C. to 70.degree. C. and containing:a) HClb) Fe.sup.3+c) HFd) emulsifiers, wetting agents, polishing agents, acid attack inhibitors;the bath being fed continuously with:an air flow equal to at least 3 m.sup.3 /h per m.sup.3 bath min. and an oxidizer quantity adjusted to the bath redox potential to be kept at 250 mV min.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: May 30, 2000
    Assignee: Novamax ITB S.R.L.
    Inventors: Cesare Pedrazzini, Paolo Giordani
  • Process for stainless steel pickling and passivation without using nitric acid
    Patent number: 5843240
    Abstract: Process for stainless steel pickling consisting in placing the material to be treated in a bath kept at a temperature ranging from 30.degree. C. to 70.degree. C. and containing:a) H.sub.2 SO.sub.4b) Fe.sup.3+c) HFd) emulsifiers, wetting agents, polishing agents, acid attack inhibitors;the bath being kept under agitation with:an air flow and continuously fed with a quantity of oxidizing agent adjusted to the bath redox potential to be kept at 250 mV min.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: December 1, 1998
    Assignee: Novamax ITB S.r.L.
    Inventors: Cesare Pedrazzini, Paolo Giordani
  • Acid aqueous phosphatic solution and process using same for phosphating metal surfaces
    Patent number: 5714047
    Abstract: An acid aqueous solution useful for phosphating metal surfaces and a phosphating process using same; said solution, which is characterized by its containing hydroxylamine phosphate as accelerator and a cationic surfactant can be applied to metal surfaces based on iron, zinc, aluminium and alloys thereof, and is specifically suitable for preventing the formation of white spots.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: February 3, 1998
    Assignee: Novamax ITB S.r.l.
    Inventor: Cesare Pedrazzini
  • Acid aqueous phosphatic solution and process using same for phosphating metal surfaces
    Patent number: 5597465
    Abstract: An acid aqueous solution useful for phosphating metal surfaces and a phosphating process using same; said solution, which is characterized by its containing hydroxylamine phosphate as accelerator and a cationic surfactant, preferably a quaternary ammonic surfactant, can be applied to metal surfaces based on iron, zinc, aluminium and alloys thereof, and is specifically suitable for preventing the formation of white spots.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: January 28, 1997
    Assignee: Novamax ITB s.r.l.
    Inventor: Cesare Pedrazzini