Journal
SURFACE ENGINEERING
Volume 25, Issue 5, Pages 376-381Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/026708408X375325
Keywords
Electroless deposition; Ni-P coating; W-Cu alloy; Adhesion; Microhardness; Corrosion resistance
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Electroless Ni-P coating was deposited on W-Cu alloy via potential activation at -0.8 V. The coating was characterised for its morphology, structure, microhardness and the corrosion resistance. Scanning electron microscopy observation showed the presence of smooth and compact crystals in the coating. X-ray diffraction analysis showed that the Ni-P coating was amorphous in structure. The adhesion between Ni-P coating and W-Cu alloy was qualified. Heat treatment can improve the microhardness of Ni-P coating. Both the porosity test and immersion test in 10 vol.-% H2SO4 solution revealed that the Ni-P coating exhibited good corrosion resistance properties in protecting the W-Cu alloy.
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