关键词: 芳纶纤维, 化学镀Ni-P/Ni-Cu-P, 纳米晶, 剥落层, 催化作用

Abstract: The coating of Ni-P/Ni-Cu-P on the surface of Kevlar fiber was achieved by electroless plating. The surface appearance and composition of original sample,coarsened sample,plated sample and spalled coating were investigated and compared by means of SEM,EDS and XRD.In addition,the formation mechanism and spalling reason of the coating was studied.The results showed that the Kevlar fiber specific surface area,hydrophilicity and activity increased after chemical pretreatment.After chemical Ni-P/Ni-Cu-P plating,the content of Ni in Ni-P coating decreased,however,the content of P increased,Ni was transformed into Ni₃P and a little Cu was discovered in Ni-P coating.The atomic proportions of Ni,Cu,P in overall coating were 8.54:3.66:5.59,the phase of the coating mostly consisted of Cu,Cu₃P and Ni₃P.Because the stress of coating distributed unequally and P gathered partly in Ni-P/Ni-Cu-P phase interface,the interface bonding strength was weakened and local stress concentration occurred,which appeared to be the reason for spalling of the coating.The chemical Cu plating relied on the catalytic action of nickel ions,which helped deposition of copper ions to form the coating.

Key words: Kevlar fibers, electroless Ni-P/Ni-Cu-P plating, nanograin, spalled coating, catalytic action