Effect of Pretreatment on the Properties of Electroless Nickel Phosphorios Coating
Publish place: 2nd International Conference on Automotive Paint and Coating
Publish Year: 1388
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICAPC02_015
تاریخ نمایه سازی: 22 تیر 1388
Abstract:
The autocatalytic (electroless) deposition of Ni–P based alloys is a well-known commercial process that has found numerous applications because of their excellent anti-corrosive, wear, magnetic, solderability, etc,… properties. It is a barrier coating, protecting the substrate by sealing it off from the corrosive environments, rather than by sacrificial action. The corrosion resistance of Ni-P coating is affected
by its thickness, phosphorous content, adhesion, microstructure, etc. In this study, the influence of mechanical polishing pre-treatments on steel substrates is investigated in terms of microstructure, deposition rate, adhesion, electrochemical and corrosion properties of electroless Ni-P nano coatings with 9-10 wt. % P content. XRD analysis of Ni-P coatings demonstrated the nanocrystalline structure
of coatings with grain size of 39 nm. Results showed that pretreatment of substrate can affect the microstructure and nodularity of coatings. Coating with the lowest nodularity have the highest mechanical and electrochemical resistance due to the absence of nodule boundaries. Results also showed that roughness of coating increased with increasing the roughness of substrate and with decreasing the
substrate roughness adhesion of coating decreases.
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Authors
A Zarebidaki
PhD Student
S. R. Allahkaram
Associate Professor and Member of Center of Excellence in High Performance Ultra Fine Materials
T Rabizadeh
MSc Student School of Metallurgy and Materials Engineering, University College of Engineering
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