DBL 8451 PDF

The Holzapfel Group plates zinc-nickel according to the following standards: VW TL , DBL , Opel GME , GMW , BMW GS and DIN. The Holzapfel Group plates zinc iron according to the following standards: VW TL , DBL , BMW G , GME , GMW , DIN Zinc-iron. specification DBL 17 which details that a 10 to 15 micron deposit should provide NSS. 9 protection of hours with no zinc and hours with no red.

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For this coating system the numbering of the product versions 845 not change when the transition is made to Cr VI -free. If necessary, an agreement concerning surface quality may have to be made.

Deviations from this Specification shall be stated on the component drawing. Parts that subsequently undergo electrophoretic dip coating cataphoretic dip coating, anodic dip coating shall not be sealed.

With regard to screws and bolts, these requirement exceptions are generally applicable to the shank and thread. View our surface coatings. The following product versions have been removed: No chipping and blistering of the coat is allowed.

Page 9 DBL Effusion treatment following a strike deposit layer thickness 2?

Performance overview – a wide range from coatings to component cleaning – Holder Oberflächentechnik

Zinc-nickel coatings dbo demonstrate the best behavior of the metallic coatings within this DBL with regard to corrosion protection quality. Any deviations shall be agreed and documented separately. Page 14 DBL The effectiveness of the heat treatment shall always be documented.

May Table 2 Cr VI -free electrodeposited coatings; technical data and requirements The friction coefficients required for threaded parts are defined in DBL Parts categor Recomme y nded layer with thickness or? More processes and coatings.

The corrosion resistance test is deemed to have been passed when each respective requirement in the tables of this DBL is complied with. Screws, bolts and nuts with coarse-pitch or fine-pitch thread, which are manufactured according to this DBL and not according to DBLshould always be treated with antifriction agent, insofar as this is not ruled out by other 841, for example the need for an additional coating with adhesives.


For this reason the Cr VI -free product versions contained in the following table, which shall comply with dbo statutory requirements, are marked specially with the supplement Cr VI -free.

Zinc-Nickel (Zn-Ni)

In such instances, the areas essential for surface protection shall be specified. More processes and coatings. The ideal heat treatment s used for a part temperature, duration, operating sequence shall be ascertained and stated in the ISIR initial sample inspection report.

Individually dyed anodised surfaces. Zinc-nickel black blackcor Learn more. When sealing, special care shall be taken to ensure that the inner surfaces of tubes bdl residual contamination requirements, or that they are compatible with the operating fluids.

Incorporation of new product versions PVs for systems, made of chromium VI -free materials. Top coats sealing are optional, but not always necessary.

The treatment of incorrect coatings removal of coatings and new coatings shall be investigated and the resulting consequences specified.

Approval for usage, following testing, shall be decided by each responsible component manager, taking all the aspects that affect the component’s function and durability into account. In many cases, parts with a thread bolts, nuts can be coated in the drum. Page 6 DBL These types of coating systems are standardized as “duplex coatings” in DIN Chrome plating gloss, semi-matt Learn more. If in Tables 2 to 4 the values are given in parenthesis e.

This type of surface finish is usually used on steel, ferrous cast components and powdered metals.


The standard requirements apply to 4851 areas not impaired by the forming process. The electrolytic plating process zinc-nickel stands out with very good corrosion protection and a high thermal resistance. Page 2 DBL Production, joining and surface-treatment methods shall be executed such that any damage through delayed hydrogen-induced brittle fracture can be ruled out with a high degree of certainty. Coating systems Learn more.


For the event of several coaters involved, reference to requirement of identical properties of component surfaces? The type of additional coating is subject to agreement. Bending of the components is recommended as an additional adhesion test, as far as practicable.

In accordance with one requirement, 3 2 then means 3 cycles of corrosion freedom for the head or the wrench area and 2 cycles for a bolt’s shank and thread. Confidentiality of the revealed data shall be assured.

An Overview Of The Coating Standards Metallveredlung Kotsch GmbH Can Adhere To

The resulting measures shall be specified by the coater. SS individual anodisation Anodised individual hybrid Partial plus anodisation. Surfaces – Anti-corrosion surfaces – Zinc-nickel. Systems specially designed for your component.

Pickling Polishing, mechanical Sand blasting. The significantly higher corrosion resistance of the metallic coating in combination with the less prominent corrosion products compared to pure zinc coatings and the low-alloyed zinc-iron coatings are characteristic of zinc-nickel coatings.

Zinc-nickel transparent transcor Learn more. The use of sealants with integrated lubricants which may have an effect on the sliding properties of the finish is not permitted in principle with regard to these components. Requirement for concrete indication of substance of passivating and sealing agents used by the supplier in the ISIR?