Characterization of Ni-P and Ni-P-Al₂O₃ Heat Treated Layers

Abstract:

Research has shown the relationship among hardness, usage and corrosion resistance Ni-P-Al₂O₃ composite coatings on steel support heat treated. The electroless strips were heat treated at 200°C, 300°C, 400°C, 500°C and 600°C. Further studies on corrosion, hardness and usage revealed changes in properties, compared to the initial state, both on the strips coated with Ni-P and the ones coated with Ni-P-Al₂O₃ composite. The samples have been studied before and after the heat treatment via Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Analysis (EDX) and X-Ray Diffraction (XRD). The results show that untreated Ni-P layers exhibit strong corrosion resistance, while hardness and usage increase with heat treatment temperature, with a peak at 400 °C. Using suspended particles co-deposition, led to new types of layers, some with excellent hardness and usage properties. Corrosion resistance increase with heat treatment. Coating layers can be adjusted to the desired characteristics, by selecting proper parameters for the expected specific results.

• Periodical: Advanced Materials Research (Volume 1143)
• Pages: 26-31
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1143.26
• Online since: February 2017
• Authors: Lucica Balint*, Gina Genoveva Istrate
• Keywords: Composite Coatings, Corrosion, Electroless Coatings, Heat Treatment

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