NÂNG CAO ĐỘ CỨNG VÀ KHẢ NĂNG CHỐNG MÀI MÒN CỦA LỚP MẠ ĐIỆN HỢP KIM Zn-Ni GIA CƢỜNG GRAPHENE VÀ ỐNG NANO CARBON

Tóm tắt

This study reported the fabrication of Zn–Ni alloy electroplating coatings reinforced with carbon
nanomaterials (CNMs), namely carbon nanotubes (CNT) and graphene (Gr), to enhance their mechanical
performance. The CNMs were functionalized with -COOH groups and uniformly dispersed into the
electroplating bath to improve stability and prevent agglomeration. Electroplating was carried out on mild
steel substrates at a current density of 2 A/dm², temperature of 45 °C, and plating time of 90 minutes, under
continuous stirring to ensure homogeneous codeposition of CNMs. The resulting Zn–Ni/CNM composite
coatings exhibited a 58.7% increase in hardness and a 4.47-fold improvement in wear resistance compared
with conventional Zn–Ni coatings. These remarkable enhancements were attributed to the intrinsic
mechanical properties of CNMs and their synergistic role in grain refinement, microstructural stabilization,
and defect regulation within the metallic matrix.