Zinc Nickel Plating

This specification covers the requirements for electrodeposited zinc nickel alloy coatings on metals. The values stated in SI units are to be regarded as the standard. The following precautionary statement pertains to the test method portion only, Section 8, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

This works standard applies to inorganic coating systems on metallic materials 1) (e.g. fasteners as standard parts and drawing parts and their accessory parts, brackets, angles, hinges ect.).

This standard specifies the plating and performance requirements for various zinc-cobalt, zinc-nickel and zinc-iron alloy electrodeposits and their associated chromate coatings, used for enhanced corrosion resistance on ferrous parts.

This specification contains metallic coatings used for protection against
corrosion and/or abrasive wear and/or for decorative reasons.
The corresponding Ob (surface treatment) number and the code designation
permit an accurate definition of the respective coating in engineering
drawings and documents.

This standard partially supersedes ATE N 106 36.11 and ATE N 106 36.31 whose
usefulness as a ready reference has progressively deteriorated as a result
of the continual addition of new coatings. Moreover, the coating thickness
tolerances defined there in some instances no longer reflect recent
practice.

This specification defines performance requirements for racked alloy coatings of zinc/nickel electrolytically deposited on ferrous surfaces from alkaline baths where corrosion protection with post-plating trivalent chromium or hexavalent chromium free conversion treatment is required.

The materials defined by these specifications are corrosion protective coatings applied sequentially per supplier specifications over steel. They consist of an alkaline zinc nickel alloy electrodeposit and a trivalent chromium passivate/adhesion promoter. A2, A3 and A4 are followed respectively by an organic seal, a cathodic electrocoat, or a waterborne top coat. When used with an integrally cured torque modified post dip, these processes provide consistent torque-tension control. All processes are free of hexavalent chromium, lead and cadmium.

This specification covers the basic requirements for barrel or rack electrodeposited zinc alloy plating over a ferrous substrate. Various alloy platings are covered by this specification with supplementary treatments. Table 1 lists the zinc alloy finishes covered by this specification.

This standard specifies the electroplating to be performed for purposes of corrosion prevention, rust prevention, and decoration. Functional plating, to be performed for wear prevention, is excluded. Inclusion of hexavalent chromium in the coating shall be prohibited beginning on December 31, 2005.

This standard specifies the electroplating applied onto the effective surfaces of automobile parts for the purpose of corrosion resistance, decoration, carburization prevention, wear resistance and others.

This specification covers the Corporation’s requirements for electrodeposited zinc coatings. Provision is also made to specify mechanical plated coatings by the addition of a suffix to the class designation. Zinc plating is used primarily for corrosion resistance. Parts to be plated will be thoroughly cleaned and free of rust, scale, oil and other foreign matter. The cleaning operation must be controlled to prevent hydrogen embrittlement, especially in those parts that are hardened, cold worked or subject to high service stresses.

This standard covers the electroplated zinc-nickel coating (hereinafter referred to as “plating”) provided on steel surface of automotive parts for the purpose of corrosion prevention. The parts made of materials provided by this standard shall conform to prohibitions and restrictions for substances of environmental concern in TSZ0001G. Exempt uses specified bu EU ELV Directive shall conform to the latest version of the Directive.

This standard specifies requirements for electrolytically deposited and
Cr(VI)-free post-treated zinc/nickel alloy coatings on ferrous materials and
steel parts with a tensile strength Rm≤1000 MPa according to code letter
“r” specified in VolksWagen standard VW 13750.

In particular, these coatings are also suitable for joining elements with
internal drive to avoid tje clogging of force-application sockets.

These coatings, used as heavy-duty corrosion protection )protection class
6), are especially suitable for components and systems of threaded joints
for which besides an increased corrosion load, a temperature load of up to
150°C (engine compartment or break area) is to be expected, as well as for
conducting connections (ground connections).

Thanks to their electrochemical compatibility, they are also suited for use
in contact with aluminum materials but not with magnesium materials.

This standard applies to the identification of general surface protection
types of vehicle parts and units in drawings and technical documentation.
Separate Technology Supply Specifications (TL Standards) apply to special
surface protection types without identification by surface protection code
(see Appendix A.2.)