1. Steel, iron: decreasing, sandblasting and phosphatizing 2. Aluminum alloy (Standard): decreasing, chromating 3. Aluminum (die-casting): chromating 4. Magnesium alloy: decreasing, chromating 5. Magnesium alloy (die-casting): chromating 6. Galvanized, Copper plating, Copper-plated zinc alloy: decreasing, chromating or phosphatizing 7. Galvanized iron plate, galvanized steel plate: degreasing, phosphating or Chromating