1. Stress relief before plating All key and important parts with a maximum tensile strength greater than 1034Mpa should be stress relieved at 200±10°C for more than 1 hour before plating, and carburized or surface quenched parts should be stress relieved at 140±10°C for 5 hours above.
2. The cleaning agent used for cleaning should have no effect on the bonding force of the coating and no corrosion to the substrate.
3. Acid activation The acid activation solution should be able to remove the rust products and oxide film (skin) on the surface of the parts without over-corrosion to the substrate.
4. Galvanized galvanizing can use zincate galvanizing or chloride galvanizing and other processes. Appropriate additives should be used to obtain a coating that can meet the requirements of this standard.
5. The light-emitting treatment should be carried out after the light-emitting plating.
6. Passivation parts that need to be dehydrogenated should be passivated after dehydrogenation. Before passivation, 1% H2SO4 or 1% hydrochloric acid should be used for activation for 5~15s. Passivation shall be colour chromated unless otherwise specified on the design drawings.
