What are the common faults of ordinary chrome plating? What is the reason? How to solve it?

1. Insufficient coating brightness due to low temperature； The current density is too high ； Low sulfuric acid content in the plating solution ； The chromium III content in the plating solution is high ； There are iron impurities; treat with ion exchange resin. 2. Poor deep plating capability: Lead chromate is formed on the anode surface, resulting in poor electrical conductivity; the anode must be cleaned with a wire brush ； High temperature of the plating solution ； Low cathode current density ； The sulfuric acid content is too high or too low ； The chromium acid content is too low ； Too much trivalent chromium ； High levels of iron and chlorine impurities; these are treated using ion exchange resins and electrolytic treatment respectively. 3. Coating peeling due to poor pre-treatment ； The internal stress in the nickel plating layer is too high; treat the nickel plating solution with activated carbon ； The performance of the intermediate coating is poor. 4. Black spots appear on the surface of the copper-tin alloy after chromium plating; the temperature of the chromium plating solution is too low ； Poor activation treatment before chromium plating ； Power on too quickly or too slowly ； High tin content in copper-tin alloy; 5. Chromium cannot be deposited in certain areas due to improper mounting or poor electrical conductivity ； The part has a complex shape, so an auxiliary anode can be used ； The hanger has poor insulation; insulating paint can be applied ； Poor pre-plating treatment; presence of oil or oxides ； The current density is too low ； The plated parts cover each other; 6. The coating burns due to too low a temperature ； The current density is too high ； Sulfate content is less than 7; the concave surface of the coating is colored yellow due to insufficient sulfate ； Low current density or no current flow. 8. The coating appears hazy and mottled; if the underlying nickel layer is hazy, the nickel layer should be checked ； Temperature is too high; 9. The coating appears rainbow-colored due to an improper combination of temperature and current density ； The temperature is too high ； The current density is too low when inserting into the tank; 10. There are obvious cracks in the coating; the temperature of the plating solution is too low ； The sulfuric acid content is too high ； The current density is too high ； Poor pre-treatment