Determination of nickel, hypophosphite and alkalinity in electroless nickel plating baths


Electroless nickel layers are normally nickel-phosphorus alloys. Sodium hypophosphite is used as the reducing agent (reductant) for the reductive chemical deposition of nickel with phosphorus inclusions.To apply even nickel layers to the workpieces, the content of nickel, reductant and the alkalinity have to be determined periodically.For the determination of the ingredients an automated ProcessLab system is used. All liquid handling steps such as taking sample aliquots, dosing reagents, titration and cleaning are performed by pumps and burets controlled by ProcessLab.A sample aliquot is transferred either to the vessel for alkalinity and nickel analysis or to the vessel for reductant content determination.