Determination of Tin and Nickel Content in Pyrophosphate Tin-Nickel Alloy Plating Bath
Tin and nickel ions are in stable complexing form in Pyrophosphate tin-nickel alloy plating bath, this paper uses back-titration of Zn2+ standard solution to determine total amount of tin and nickel ions, and spectrophotometry to determine content of nickel ions in the bath to study interference and elimination methods of co-existing components. The results show that: eliminate the interference of pyrophosphate by heating the solution to hydrolyse and mask Sn4+ and Fe3+ effectively with triethanolamine, the total measurement error is about 0.91%, standard deviation is 0.0141; The recovery of determination for nickel ion content is 99.13%, and standard deviation is 0.0180; The method i-s simple, fast and is able to meet the analytical requirements for controlling the plating quality.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
Q. J. Geng and X. Wei, "Determination of Tin and Nickel Content in Pyrophosphate Tin-Nickel Alloy Plating Bath", Advanced Materials Research, Vols. 233-235, pp. 214-218, 2011