The JB/T 12855-2016 standard specifies the technical requirements and test methods for zinc-nickel alloy platings on steel substrates. The standard is applicable to parts in the fields of automotive, aerospace and weapons, covering zinc-nickel alloy platings with nickel content of 5% to 10% (low nickel) and 10% to 17% (high nickel). The standard details the performance requirements of zinc-nickel alloy platings such as thickness, adhesion, corrosion resistance, and notes that it is not applicable to parts with tensile strength greater than 1200MPa or in contact with mg material. This standard is designed to ensure the Reliability and durability of platings under various conditions of use.