Dark Spots or Staining
Should you expect any stains on your plated parts, even just slight traces of water marks? No! Staining can be prevented by good rinsing, and the proper drying method selected to match your finish and part geometry. Other factors include:
- Poor surface preparation
- Imbalance of electroless nickel chemistry
- Incorrect electroless nickel phos content for the application
- To high a porosity of the plating material
- Rinse water may be overly alkaline or acidic
- Not enough rinse tanks
- Inferior drying methods
- Unsatisfactory packaging conditions - Lack of nitrogen back filling packaging