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Corrosion protection properties of electroless Nickel/PTFE, Phosphate/MoS2and Bronze/PTFE coatings applied to improve the wear resistance of carbon steel

Authors
Publisher
Elsevier B.V.
Publication Date
Volume
173
Identifiers
DOI: 10.1016/s0257-8972(03)00662-5
Keywords
  • Salt Spray Test
  • Electroless Deposition Of Nickel With Ptfe
  • Zinc Phosphate
  • Ptfe With Bronze Particles
  • Mos2
Disciplines
  • Chemistry

Abstract

Abstract The aim of this work is the evaluation of corrosion behaviour of some industrial coatings on carbon steel, utilised to improve tribological behaviour. In particular, composite electroless nickel coatings with polytetrafluoroethylene (PTFE) particles, sintered bronze in PTFE matrix layers and zinc phosphates—with and without MoS 2 coatings—were analysed. Salt spray fog exposure and electrochemical tests were carried out. Electroless nickel coatings showed the best protection properties with a good barrier protection, because of the coating structure: an external layer, which contains PTFE particles improving tribological properties, and an inner nickel layer, which protects against corrosion because of barrier effect. PTFE-coated sintered-bronze samples showed limited corrosion resistance due to the high number of defects present. The application of a MoS 2 polymer-embedded layer improves the characteristics of phosphate conversion coatings, which, by themselves, cannot assure good protection.

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