MANUFACTURING TECHNOLOGY
Opening new horizons for corrosion protection
Large R&D resources in NOF Metal Coatings Europe (previously Dacral) have been allocated in recent years to the development of the range of GEOMET®
applications. N production routes for the GEOMET®
OF Metal Coatings explains that these developments open new possibilities for industrial applications in the field of protection against corrosion. At the same time, NOF Metal Coatings’ R&D helps in developing chemicals, allowing the VOC
content of these water-based products to be reduced substantially. A recent development at NOF Metal Coatings was black
corrosion protective coatings for threaded parts and other metal components, which are requested for design reasons by the automotive industry as well as in other industrial fields. NOF Metal Coatings offers two families of black coatings:
• GEOBLACK® ML and GEOBLACK® addition to the GEOMET® and topcoat GEOKOTE® 500M - Obtained by basecoat a PLUS® Black topcoat.
• GEOBLACK® KT - A new development with basecoat GEOMET®
Black. This topcoat
ensures a high resistance against all chemicals including strong acids and solvents.
All black coatings are chromium-free, water based, and offer
a high corrosion resistance: 1,000 hours NSS (Neutral Salt Spray Test) without red rust (Fe corrosion) or white rust (Zn corrosion).
New DELTA-MKS® approval in Asia
Dörken MKS-Systeme has announced that the products of its DELTA-MKS®
-Systeme
have recently been incorporated into the global specifications for high-performance corrosion protection of Japanese motor vehicle manufacturers NISSAN (according to M4601 2010-N) and ISUZU (according to ISC-B22-003F).
consulting locally, which is why it has opened a Tech-Center in Shanghai, joining the existing one in Korea. “This is a further step to providing optimal support for the entire Asia region in the scope of the global MKS network.”
D 88
örken highlights that with this incorporation DELTA-MKS®
-Systeme continues its progression
in the Asian market. Dörken also has a goal of optimising technical
Also, outdoor weathering tests and vehicle tests have shown a corrosion resistance performance that matches the current expectations for chassis parts in the automotive industry. Another development by the R&D department at NOF Metal
Coatings is life-resistant coatings for chassis components. NOF Metal Coatings explains that in order to obtain a life lasting zinc- based coating on chassis components in the automotive industry, it is necessary to apply a sufficient thickness of coating material. Depending on the application, a range of 15µm to 30µm will give the appropriate protection. As the usual thickness of GEOMET® for bulk parts is 6µm to 10µm, ways for increasing the thickness had to be studied by NOF Metal Coatings. After NOF Metal Coatings had carried out the R&D it introduced a specific product, GEOMET®
900, which enables the application
of 15µm to 30µm in 1 or 2 coats. The product development was completed together with the application process development. After alkaline degreasing and without phosphating, the components are dipped in the GEOMET®
tank and drawn out
at a controlled speed. As the product is non-drip and non-sag, the drying and curing cycle can start immediately. “Practical trials over two years, with components of various types and shapes, have proved the potential of this development.”
Minimising tooling and changing times
With the newly developed ‘Schleipo N1’, a grinding and polishing machine for bright drawn steel, SMS Meer, Germany, says it is helping minimise tooling and changing times between two orders from two hours to just ten minutes.
bars are used as piston rods or as steering and drive components.“ In addition to a new grinding spindle bearing and drive system,
J Fastener + Fixing Magazine • Issue 69 May 2011
special devices enable the guides to be pre-set and the grinding wheels to be quickly changed outside of the machine. Other benefits include ergonomic operation and easy maintenance. “Overall the series guarantees a higher degree of flexibility
thanks to a modern operating and tooling concept, with increased performance at the same time,” continues Kahlen. The new ‘Schleipo N1’ from SMS Meer operates in a bar diameter
range from 2mm to 25mm and is designed for a minimum bar length of 1,300mm. Furthermore, an intelligent control system and laser measuring system ensure that a high level of quality is consistently maintained. For example, materials of different grades can be used thanks to the programmable grinding wheel dressing device.
ohannes Kahlen, head of the Schumag & Copper Product Unit says: “It allows our customers to produce even small lots quickly and flexibly. This is being increasingly demanded by the automotive industry where the polished bright steel
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