Session 11: Corrosion & Wear Deposit Coatings
The audience in this session will leave with an understanding of how new developments in High-P Electroless Nickel technology have increased the performance of the deposit and in doing so created new markets and opportunities for the coating. Validation performance data across the key characteristics will be presented as well as some case study applications where the new properties could prove the most useful.
Advances in Surface Finishing Technology
Corrosion or Wear Deposits/Coatings
Electroless deposition of the nickel phosphorus alloy coatings (electroless Ni-P) has been widely used in many industrial applications for the unique properties such as corrosion resistance, wear resistance, non-magnetism, improved micro-hardness and coating thickness uniformity. Because of its amorphous nature and passivity, the corrosion resistance of the coatings, especially of the high–P EN >10.5% P, are excellent and in many environments are superior of that of pure nickel or chromium alloys. Toxic heavy metals have been historically used as stabilizers and brighteners in electroless nickel processes but in the last years the worldwide regulations became very restrictive regarding their use.
The newest generation of high–P EN processes use unique stabilizers with improved coating properties; specifically corrosion resistance. Process and coating properties like deposition rate, P–content, internal stress, tribological properties as well as their corrosion resistance are highlighted.