The density of the electrical components on the PCB circuit board is high, and the residual separation on the surface will cause the possibility of separation migration, resulting in open circuit, short circuit and other phenomena. If there is acid residue on the surface of the circuit board, it will corrode the circuit board and reduce the service life of the product.

Instruments and equipment 

Ion chromatograph: CIC-D180 ,  SH-AC-11 column (for anion) ,SH-CC-3L  column (for cation),SH-AC-23 column(for Organic acid) 

Sample chromatogram