At the Fastener Fair, Dörken MKS Systems presented Delta-Protekt® KL 120, the company's new, strong basecoat with outstanding corrosion protection properties. A particular feature is the extremely high level of white rust resistance in combination with all topcoats - especially interesting in the case of black topcoats.
With its most powerful zinc flake basecoat, Dörken MKS-Systeme GmbH & Co. KG from Herdecke is setting new standards in the coating systems market. While delivering the same level of performance, Delta-Protekt® KL 120 goes up to 30 percent further than other basecoats in the Delta-Protekt® range. The highly efficient material, which was at the centre of the company's presentation at the 2015 Fastener Fair in Stuttgart, is compatible with all topcoats from the Delta MKS Systems' product portfolio. With a total coating thickness of 18µm – depending on layer build-up, shape of the parts and method of application – the systems achieve corrosion endurance times as per DIN EN ISO 9227 of 1,000 hours against red and white rust on mass bulk materials put through manufacturing processes. This becomes particularly evident, of course, with black topcoats. In salt spray testing, the black surface remains practically unaltered for up to 1,000 hours.
The basecoat provides cathodic corrosion protection through the sacrificial effect of the zinc. The layers of flakes arranged in a scale-like manner produce a barrier effect that - compared to conventional galvanic corrosion protection coatings - appreciably slows down the attack of corrosive media such as moisture and oxygen. Another advantage is that as no hydrogen is supplied in the coating process, there is no risk of hydrogen embrittlement of high-strength components.
The choice of coating technique to apply is dependent on the part concerned. All standard coating techniques can be used. Bulk small parts are generally coated using dip-spinning; heavy parts not capable of free-flowing conveyance can be coated either by the spin coating method or by spraying. The latter is also used for geometrically complicated parts. After each coating cycle, the material is chemically cross-linked in continuous furnaces at temperatures of c. 240°C.
For further information: www.doerken-mks.de