Dörken Offers Coating System with Black Appearance

Originally titled 'Coating System with Black Appearance'

Dörken Corporation USA’s coating system provides fasteners with both high performance and durable black corrosion protection.

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Dörken Corporation USA’s coating system provides fasteners with both high performance and durable black corrosion protection. The coating, which represents an addition to the black coatings of the Delta-MKS product series, consists of the matt zinc flake basecoat Delta-Protekt KL 120 and the water-based black topcoats VH 321 GZ and VH 322 GZ.

Together, these coatings provide reduction of white corrosion, excellent adhesion and resistance to abrasion while meeting the respective coefficients of friction, the company says. The system was developed specifically for screws and other fasteners for use in the automotive industry.

The system fulfils the requirements of the automotive industry with regard to corrosion protection, while at the same time giving components a stable black surface. With an overall layer thickness of 18 microns depending on the structure of the layer and geometry of the parts, corrosion durability of 840 hours as per DIN EN ISO 9227 is achieved. Further, white rust resistance of 240 hours is significantly exceeded. The basecoat guarantees active cathodic protection and optimized adhesion to steel while the topcoat ensures higher chemical resistance, the consistency of the coefficients of friction and satisfies temperature resistance requirements, the company says.

The system can be applied using all standard methods, such as dip, dip spin or spray. The choice of procedure depends on the size and geometry of the parts.