EP 3858495 A1 20210804 - METHOD FOR PRODUCTION OF CORROSION-RESISTANT STEEL STRIP
Title (en)
METHOD FOR PRODUCTION OF CORROSION-RESISTANT STEEL STRIP
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES KORROSIONSBESTÄNDIGEN STAHLBANDES
Title (fr)
PROCÉDÉ DE PRODUCTION D'UNE BANDE D'ACIER RÉSISTANT À LA CORROSION
Publication
Application
Priority
- RU 2020104734 A 20200203
- RU 2020133012 A 20201006
Abstract (en)
A method for production of a pre-painted steel strip is proposed, which ensures forming a monolithic coating with improved corrosion resistance and mechanical strength, the method comprising steel strip surface treatment in a 10-50 g/l pickling solution in the pickling bath at 60 °C, with a strip temperature of 20-25 °C; passing the pickled steel strip through a bath with molten metal, comprised of: 1.0-1.4 wt% of metallic aluminium, 1.0-1.4 wt% of metallic magnesium, up to 0.5 % of impurities and the balance being metallic zinc, thus forming a metallic coating; treating the metallic coating with an aqueous suspension of 15 - 40 g/l alkaline salt at the pH= 10-12 in the degreasing bath at 60 °C, with the strip temperature of 20-25 °C, the solution comprising a 1 - 7 g/l of a surfactant; applying a Ti-containing conversion layer of dihydrogen hexafluortitanate on the metallic coating; successively applying a thermoset primer layer and a thermoset polymer top coat layer on the surface of the conversion layer; bringing the steel strip temperature down to a room temperature when curing of the thermoset primer and the thermoset polymer top coat is completed; wherein the thermoset primer and thermoset top coat compositions are selected to have a difference between their curing temperatures within 0-5 °C; wherein the curing time difference of the thermoset primer and the thermoset polymer top coat after their application to the conversion layer surface is 0-10 seconds.
IPC 8 full level
B05D 3/10 (2006.01); B05D 7/00 (2006.01); B05D 7/14 (2006.01)
CPC (source: EP)
B05D 3/102 (2013.01); B05D 7/14 (2013.01); B05D 7/51 (2013.01); B05D 7/54 (2013.01); B05D 2202/10 (2013.01); B05D 2350/00 (2013.01); B05D 2350/65 (2013.01)
Citation (applicant)
WO 2013160567 A1 20131031 - ARCELORMITTAL INVESTIGACION Y DESARROLLO SL [ES], et al
Citation (search report)
- [I] WO 2015052546 A1 20150416 - ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO S L [ES]
- [A] US 4101345 A 19780718 - HUNTER ROBERT F, et al
- [A] WO 2004067190 A2 20040812 - PPG IND OHIO INC [US]
- [A] EP 2088219 A1 20090812 - JFE GALVANIZING & COATING CO [JP], et al
- [A] WO 2013083292 A1 20130613 - TATA STEEL NEDERLAND TECHNOLOGY BV [NL], et al
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 21155025 A 20210203