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Improvement of the adhesive and corrosion resistance properties of unpainted and painted electrogalvanized steels

Objective



Objectives and content
In this project the partners will investigate the
possibilities of the incorporation of polymeric particles
and organic molecules into electrolytic zinc coatings
produced in continuous coil coating and barrel plating
processes on steel.
The industrial objectives are:
the elimination of environmentally unfriendly pretreatment processes (e.g. phosphating) presently used to
ensure a good paint adhesion onto electrogalvanised
steel,
the achievement of a strong paint adhesion to
electrogalvanised steel through chemical bonding
reactions between primer or paint and polymeric particles
or organic molecules fixed at the surface of the
electrolytic zinc,
the improvement of the corrosion resistance of painted
and unpainted electrogalvanised steel through an improved
self-passivation of the polymer-containing zinc layer in
comparison to current electrodeposited zinc layers.
The technical objectives are:
development of advanced plating practices to obtain
zinc coatings with modified bulk and surface properties,
assessment of properties and quality of painted
electrogalvanised steel parts (formability, corrosion,
paintability) through accelerated laboratory tests and
field testing.
In order to achieve these objectives five research
centres with complementary skills in surface technology
and chemical engineering will develop the necessary know
how. Five industrial partners will support this project
by bringing in their expertise and skill in making,
shaping, treating and testing of unpainted and painted
electrogalvanised steel. The technologies of the
controlled incorporation of particles and molecules into
electrolytic zinc that will be developed in this project
will be fully compatible with the actual
electrogalvanising technologies for the mass production
of coated steel parts (e.g. coil coating, barrel
plating). The expected benefits are the reduction of
process steps (namely elimination of conversion
treatment) and the improvement of the performance
(increased paint adhesion, higher corrosion and ageing
resistance) of steel products coated or not with primers
and paints.
The electrolytic codeposition of polymeric particles with
zinc is quite similar to the well-established Ni-SiC
composite plating process in the automotive industry.
The process is poised to become a technological feasible
alternative to the Zn-SiO2 proposed some years ago by
Japanese companies. This last process is riddled with
problems that limited its applicability. In view of the
partners foreground know how, this part of the project
can be considered as of medium risk. The electrolytic
codeposition of organic molecules is on the contrary of
high risk due to its large novelty aspect. It is
intended to become an alternative to the zinc alloy
practice (e.g. phosphated Zn-Ni and Zn-Fe) for achieving
electrodeposited zinc with large corrosion resistance and
paintability.
Areas covered:
new methodologies for product design and manufacture
(long term)
development of clean production technologies (medium
term)
reliability of the quality of materials and products
(long term).

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

KATHOLIEKE UNIVERSITEIT LEUVEN
Address
2,Kasteelpartk Arenberg, 44
3001 Heverlee
Belgium

Participants (8)

Aristotle University of Thessaloniki
Greece
Address
University Campus
54006 Thessaloniki
DAF TRUCKS N.V.
Netherlands
Address
Hugo Van Der Goeslaan 1
5600 PT Eindhoven
FORSCHUNGSINSTITUT FUER EDELMETALLE UND METALLCHEMIE E.V.
Germany
Address
17,Katharinenstrasse 17
73525 Schwaebisch Gmuend
OCAS - ONDERZOEKSCENTRUM VOOR AANWENDING VAN STAAL N.V.
Belgium
Address
3,John Kennedylaan 3
9060 Zelzate
Romanidis J. Christos
Greece
Address
41,Al Papdiamandi
54645 N Eykarpia - Thesaloniki
Sika Chemie GmbH
Germany
Address
107,Kornwestheimer Strasse
70439 Stuttgart
TECHNION - ISRAEL INSTITUTE OF TECHNOLOGY
Israel
Address
Technion City
Haifa
UNIVERSITÉ DE FRANCHE-COMTÉ
France
Address
16,Route De Gray 16
25030 Besançon