Troubleshooting Non-Cyanidezinc

Troubleshooting for Non Cyanide Zinc Plating Solution

1. Slow Zinc Plating:

   • Low Zinc Content: Increase zinc content to 8 – 22 g/L

   • Low Solution Temperature: Maintain temperature between 30–32°C

   • Excessive Workpieces: Reduce the number of workpieces

   • Low Current Density: Check the connections of the anode and power supply

   • Cyanide Contamination: Consult a technician

2. White Frost on Low Current Areas:

   • Low Brightener: Add brightener at 0.2 cc/L

   • Heavy Metal Contamination: Add metal remover at 0.5 cc/L and dummy the solution

   • Improper Temperature: Adjust solution temperature

   • High Zinc Content: Reduce zinc content or dilute the solution

   • Low Current Density: Increase current density

3. Inconsistent or Poor Coverage:

   • High Zinc Content / Low Brightener: Adjust the brightener or reduce zinc content

   • High Solution Temperature: Lower temperature to 30–32°C

   • Insufficient Anode Area: Increase the anode area by adding more zinc plates

   • Uneven Agitation: Improve air agitation

   • Inadequate Cleaning: Review cleaning process, including degreasing and electrical separation solutions, or extend cleaning time

4. Excessive Brightener Usage:

   • High Solution Temperature: Lower temperature to 30–32°C

   • High Drag-Out Volume: Reuse rinse water

   • Organic Contamination: Filter with activated carbon

   • High Anode Current Density: Increase the anode area

5. Strong Chemical Odor:

   • No Foam on Plating Surface: Add odor neutralizer at 0.125 cc/L

   • Excessive Current Density: Reduce current density

   • Poor Plating Efficiency: Increase zinc content and adjust solution temperature

6. Rough or Burnt Plating Surface:

   • Contaminants in Solution: Check filtration

   • Excessive Current Density: Reduce current density

   • Inadequate Rinsing: Increase overflow rate of rinse water to ensure cleanliness

7. Flaking or Poor Adhesion:

   • Inadequate Cleaning: Review the cleaning process, including degreasing and electrical separation solutions, or extend cleaning time

   • Excessive Brightener: Dummy the solution or settle excess brightener with zinc powder

   • Heavy Metal Contamination: Dummy the solution or filter with zinc powder

   • Organic Contamination: Filter with activated carbon

   • Contaminated Anodes: Use zinc plates with at least 99.99% purity

   • Low Brightener: Add brightener at 0.2 cc/L

8. Non-Shiny or Dull Spots on Plated Surface:

   • Organic Contamination: Filter with activated carbon

   • Excessive Brightener or Low Zinc Content: Adjust zinc content and reduce brightener addition

   • Poor Quality Water: Add metal remover at 1.0 cc/L

Adhering to these guidelines can help improve the quality of cyanide-free alkaline zinc plating and minimize common issues.

Non-Cyanide Zinc Plating 1221: ยาเงาซิงค์อัลคาไลน์ไม่มีไซยาไนด์ 1221

Troubleshooting for Cyanide-Free Alkaline Zinc Plating Solution (MILLENIUM 1221)

1. Preparation and Operating Conditions

Parameters to Control:

• Zinc Oxide: 12 g/L (Range: 8 – 15 g/L)

• Sodium Hydroxide: 120 g/L (Range: 100 – 170 g/L)

• NaOH : Zn: 12 : 1 (Range: 12/15 : 1)

• MILLENIUM 1221 A: 10.0 mL/L (Range: 8.0 - 12.0 mL/L)

• MILLENIUM 1221 B: 1.0 mL/L (Range: 0.5 – 1.5 mL/L)

• MILLENIUM 1221 C: 2.0 mL/L (Range: 1.5 - 2.5 mL/L)

• Temperature: 25 °C (Range: 20 - 35°C)

• Current Density: 0.5 – 1.0 A/DM² (Range: 0.2 – 4.0 A/DM²)

• Cathode : Anode: 1/1.5 : 2.0

Equipment Required:

• Tank: PP tank or steel coated with PP

• Agitation: Movement is essential

• Filtration: Continuous filtration is necessary; avoid using paper filters

• Cooling: Necessary for continuous plating; depends on solution volume

• Ventilation: Required

Preparation of Solution:

1. Add DI water to the tank, filling approximately 1/3 of the tank

2. Add sodium hydroxide while stirring until fully dissolved; this will generate heat

3. Add zinc oxide to the hot sodium hydroxide solution while stirring vigorously until fully dissolved

4. Add water to achieve the final volume

5. It is recommended to use zinc and carbon treatment if solution or plating quality is poor

6. Start plating at 0.05A/DM² for 8-10 hours

7. Add additives and zinc plates as needed

Additives:

• MILLENIUM NCZ 1221 A: 125 - 150 mL/KAH

• MILLENIUM NCZ 1221 B: 50 - 75 mL/KAH

• MILLENIUM NCZ 1221 C: 20 - 30 mL/KAH (30 - 50 mL/KAH if water quality is poor)

Maintenance:

• The plating bath temperature should be maintained at 25 - 30°C

• Analyze zinc and sodium hydroxide periodically

  • Racking Tank: 10 : 1 (NaOH : Zn)

  • Barrel Tank: 12 : 1 (NaOH : Zn)

• Zinc addition should be done via an external reservoir