Thermodynamic Calculation of Nickel Complex in Electro less NickelSolutions during Plating
Chen Huangpu,Zong Yujin
(Xi'an Jiaotong University,Xi'an 710049,China)

Abstract:The theories of coordination chemistry and thermodynamic calculation, are applied toinvestigate the dynamic speciation and deposition behavior of the nickel complex in the electroless nickelsolution during plating.The plating rate and solution stability are dependent upon the structure and speciation of the nickel complex as well as their dynamic evolution. Although higher deposition rate reguires sufficient free nickelion, it is necessary for the ionic-nickel chelate to shed its ligands to form free nickel ion such that thermodynamic equilibrium of free nickel could be kept in the solution during plating.This guarantees not only a higher depositi on rate but also the solution stability.
Keywords:electroless nickel plating;coordination chemistry;complex-ion;
thermodynamic equilibrium