Effect of Heat Treatment on Microstructure and Corrosion Resistance of Ni-P/BN(h) Composite Coatings

Abstract:

The Ni-P/ BN(h) composite coatings were prepared by pulse electroplating,and were heat treated at temperature of 200～400°C.The microstructure of the composite coatings was identified by X-ray diffraction,the corrosion behavior of the composite coatings in 3.5%NaCl and 10%H₂SO₄ solutions was investigated by the linear polarization measurements and scanning electron microscope (SEM).The results show that the as-deposited is an amorphous structure,the precipitated phases are Ni₁₂P₅ and Ni₅P₂ metastable state phases when heat treatment temperature is below 300°C,the precipitated phases is Ni₃P stable state phase heat-treated at 400°C，the composite coating was crystallized in great degree.Both the as-deposited and heat treated composite coatings revealed best corrosion resistance in 3.5%NaCl and 10%H₂SO₄ solutions.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 3362-3366
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.3362
• Online since: May 2011
• Authors: Cheng Zhang Peng, Ling Ling Zhu, You Ming Chen
• Keywords: Corrosion Resistance, Heat Treatment, Microhardness, Ni-p/bn(h) Composite Coating, Pulse Electroplating

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