100
Thielco offers Chromium-VI free coating technology
Thielco Metal Coating BV has held the licence formula and the whole process is regulated for Depending on the requirements of the
for the chromium-VI free coating technology each individual product to obtain the best customer the parts can be treated on the third
from Dacral, called Geomet®, for the last quality. line with a lubricant which regulates the
three years. Using a special filling system the products are coefficient of friction. For several applications
This technology offers an environmental transported to the balance where they are this is very important. After a process time of
alternative for technologies using solvents, weighed and separated in loads from 100 to eight hours the products treated with Geomet®
mechanical or electro-plating coatings on small 200kgs depending on type. After weighing, the are transported to the unload position.
metal parts. products go to pre-treatment where oil and Samples are taken to analyse several
Thielco built a complete new factory for this grease is removed. After this alkaline degreasing parameters. A standard salt spray test, according
application in January last year, which is now the products are rinsed and dried. to ISO 9227, takes place on the samples. Dacral,
fully operational and allows it to treat all kind of Chemical pre-treatment is followed by a the supplier of the raw-material and the licence,
products, e.g. bolts, nuts, clamps, washers, etc. mechanical pre-treatment, which is the base for also takes regularly samples of the treated parts
In a specially built and completely automatic a good cohesion between steel and Geomet®. to analyse in its laboratory in Creil, France.
production line a zinc-aluminium layer is fixed After pre-treatment, the Geomet® application With this process, Thielco is able to offer the
on the products. With this technology an takes place. Depending of the corrosion customer a wide range of services. Thielco
extremely high corrosion protection can be resistance, two or three layers of Geomet® are Staalindustrie BV, the mother company of Thielco
reached, and hydrogen embrittlement does not applied. Metal Coating, specialises in surface-treatment
occur. After dipping in the Geomet® suspension the offering its customers:
The secret of this process is in the composition products are transported to the first oven. Here
of the raw material - Geomet®, a patent from the products are dried at 70°C then baked at • Hot dip galvanizing according ISO 1461.
the French company Dacral. To accomplish a 315°C to achieve a good cohesion between the • Hot dip centrifugal galvanizing according ISO
very homogeneous raw material, this Geomet® steel and Geomet®. The process is repeated for 1461 and ISO 10684.
has to be stirred for 24 hours. layer two and, depending on the requirements, • Mechanical plating / galvanizing.
For every specific product there is a unique for layer three. • Powder coating (kleurzink®).
New high performance
fastener coatings
according to DIN, ASTM and OEM specifications, this finish proved to
give the highest possible corrosion performance.
MacuGuard LM Duplex finish is based on a two layered deposit
containing a primary layer of zinc and a secondary layer or zinc
MacDermid has
aluminium alloy. In various corrosion investigations according to DIN,
announced its latest
innovation in ultra high performance
ASTM and OEM specifications, this finish proved to give exceptional
coatings and says it is the ultimate in
corrosion performance and very good prevention of galvanic corrosion,
fastener engineering properties.
in contact with light metals. MacDermid points out that MacuGuard LM
The new coatings are based on a unique zinc
Duplex delivers high performance at a competitive cost, enabling the
aluminium alloy offering performance benefits that MacDermid says no
coating to be targeted at market segments currently serviced by
other coating can deliver. These finishes represent a new standard for non
finishes like dip spin coatings.
embrittling high corrosion resistant coatings with excellent electrical “In order to successfully introduce the MacuGuard LM process our
connectivity, predictable torque/friction, zero head and thread fill, no
approach has been to build a small, highly competent applicator base
sticking and EoLVD compliance. MacDermid believes that the ability to
with which we work closely, ensuring technical and service competency.
successfully process complex geometries, including clips, nuts and
fastener sizes below M6, makes MacuGuard LM the ultimate high
The MacuGuard LM process also forms part of the ZinKlad LM quality
performance fastener coating.
supplier program and as such is subject to its rigorous auditing process.”
To meet the wide variety of today’s market requirements, two coatings
options have been developed, which fulfil specific performance needs:
MacuGuard LM 90 - Single layer alloy deposit.
MacuGuard LM Duplex - Two layered alloy deposit.
MacuGuard LM 90 is a ‘true’ zinc-aluminium alloy which contains
8 – 11% aluminium and reduces galvanic induced corrosion between steel
fasteners and light metal components. In various corrosion investigations
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