EP 2430206 B1 20130703 - MODIFICATION OF THE COMPOSITION OF THE FLUX SOLUTION FOR HOT-DIP BATCH GALVANIZING OF STEEL PARTS
Title (en)
MODIFICATION OF THE COMPOSITION OF THE FLUX SOLUTION FOR HOT-DIP BATCH GALVANIZING OF STEEL PARTS
Title (de)
VERÄNDERUNG DER ZUSAMMENSETZUNG EINER FLUSSMITTELLÖSUNG FÜR STÜCKFEUERVERZINKUNG VON STAHLTEILEN
Title (fr)
MODIFICATION DE LA COMPOSITION DE LA SOLUTION DE FLUX POUR LA GALVANISATION EN LOTS PAR TREMPAGE À CHAUD DE PIÈCES D'ACIER
Publication
Application
Priority
- IT 2010000052 W 20100217
- IT AL20090002 A 20090219
Abstract (en)
[origin: WO2010095154A1] The present invention aims at contributing to the solution of potential problems arising from the presence of ZnCl2 in the galvanizing shop, by means of a procedure for the preparation of surface of pre-fabricated steel pieces to be hot-dip galvanized in a Zn-Al-alloy, according to which the concentration of ZnC12 into the flux solution is maintained below the limit prescribed by the law and preferably down to zero. According to this procedure, the steel pieces, after pickling are immersed into an aqueous solution containing ZnCl2, NH4Cl and Bi2O3. Using the flux solution according to the present invention it is possible to coat in a batch galvanizing bath containing a Zn-Al-alloy, carbon steels and steels with high Si content, and/or Mn, and/or P (i e. steels commercially known as Sandelin or Iper-sandelin steels), usually considered difficult steels for galvanizing. obtaining coatings with uniform thickness, with no surface defects and with a smooth surface without non-homogeneous areas.
IPC 8 full level
C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/30 (2006.01)
CPC (source: EP US)
C23C 2/022 (2022.08 - EP US); C23C 2/024 (2022.08 - EP US); C23C 2/06 (2013.01 - EP); C23C 2/12 (2013.01 - EP); C23C 2/30 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010095154 A1 20100826; EP 2430206 A1 20120321; EP 2430206 B1 20130703; IT 1392855 B1 20120402; IT AL20090002 A1 20100820
DOCDB simple family (application)
IT 2010000052 W 20100217; EP 10711936 A 20100217; IT AL20090002 A 20090219