YB/T 4680-2018 Evaluation method for chromium-free passivating of corrosion galvanized sheets of metals and alloys specifies the method for evaluating the use of hexavalent chromium-free passivating solution and the passivating film formed on the surface of galvanized sheets. The standard includes test equipment, test materials, specimen preparation, detailed test procedures, and requirements for test results and reporting. The scope of application covers the determination and evaluation of the performance of passivating film on the surface of galvanized sheets, but does not include the performance evaluation of chromium-free passivating film on silicon steel. The standard refers to a series of GB/T standards, such as Paints aging rating method, steel coating solvent wiping test method, etc., to ensure accurate and reliable evaluation results, suitable for metal and alloy corrosion protection needs in industrial applications.