The "GB/T 18684-2002 Technical Conditions for Zinc-Chromium Coatings" standard specifies the technical requirements and test methods for zinc-chromium coatings on steel parts and components. The standard covers the definition of zinc-chromium coatings, adhesion strength tests, Film thickness measurement and salt fog corrosion testing and other technical details. Zinc-chromium coatings are formed from water-based zinc-chromium coatings. The main components are phosphorus flake zinc and zinc chromate, which have good anti-corrosion performance. This standard aims to ensure the mass and performance of zinc-chromium coatings, providing consistent technical basis and test methods.