1.1 This specification establishes the performance requirements for a nanostructured zinc-nickel alloy coating on metal. 1.2 The nanostructured zinc-nickel alloy coating shall comprise nanoscale grains of zinc-nickel alloy or nanoscale layers of zinc-nickel alloy. 1.3 The intended application method for the nanostructured zinc coatings is a deposition process and may include: physical vapor deposition, chemical vapor deposition, or immersion plating. 1.4 This specification covers both unfabricated products and fabricated products, for example: rebar, long products, assembled steel products, and structural steel fabrications. This specification also covers steel forgings and iron castings. This corrosion resistant coating is intended for use on high strength, structural and nonstructural steel components and assemblies. 1.5 The nanostructured zinc-nickel alloy coating may be one of three categories of products based on intended use and performance properties including: 1.6.1 Category IA 20-m thick, nanostructured zinc-nickel alloy coating without passivate, 1.6.2 Category IIA 20-m thick, nanostructured zinc-nickel alloy coating with Cr (III) passivate 1.6.3 Category IIIA 20-m thick, nanostructured zinc-nickel alloy coating with Cr (VI) passivate. 1.7 UnitsThe values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
This specification will be used in the specification of coatings that would replace toxic cadmium for corrosion and wear protection of high strength steels.
Keywordsnanostructure, zinc-nickel, low hydrogen embrittlement, cadmium replacement
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top