ISO 19598 Designation Codes Code Designation Description Zn Zinc Coating Pure zinc coating used for general corrosion resistance on steel. ZnNi Zinc-Nickel Alloy Coating Zinc-nickel alloy, offering high corrosion protection, especially in harsh environments. ZnFe Zinc-Iron Alloy Coating Zinc-iron alloy coating suitable for applications needing both wear and corrosion resistance. Cn Iridescent Passivation Iridescent passivation … Continue reading ISO 19598 Designation | Metallic coatings — Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(VI)-free treatment