Determination of tin,phosphorus,lead,zinc and nickel in nickel-plated tin bronze strip substrate by selective dissolution separation-spark discharge atomic emission spectrometry
The accurate determination of tin,phosphorus,lead,zinc and nickel in nickel-plated tin bronze strip substrate is the precondition to ensure the product quality.The nickel coating and tin bronze substrate on the surface of nickel-plated tin bronze strip sample were selectively separated with soak solution com-posed of 4.5 mol/L nitric acid and 1.25 g/L CM-911 nitric acid corrosion inhibitor in water bath at 40 ℃.After rinsing with clean water and anhydrous ethanol,the sample was pressed to block by cold-press meth-od.The pressure was 70 t and the pressing time was 2 min.The working curve of bronze was selected.The standard sample of tin bronze was used as control sample for the calibration of working curve.The determi-nation of tin,phosphorus,lead,zinc and nickel in nickel-plated tin bronze strip substrate by spark discharge atomic emission spectrometry was realized.Two rolls of tin bronze sample with different brands were se-lected.The electro-nickeling was conducted for both top and bottom sides to prepare the nickel-plated tin bronze sample.The contents of tin,phosphorus,lead,zinc and nickel in nickel-plated tin bronze strip sub-strate were determined according to the experimental method.The results showed that the relative standard deviations(RSDs,n=6)of determination results were less than 0.3％when the contents(mass fraction,the same below)of elements were in range of 1％-10％.When the contents of testing elements were in range of 0.01％-0.4％,the RSDs(n=6)were less than 4％.GB/T 5121 was used to analyze the elements in tin bronze strip for the comparison.The results showed that the found results of two methods were basically consistent.The proposed method was applicable for the chemical composition detection of multilayer mate-rials by spark discharge atomic emission spectrometry,which solved the problem that the breakdown of sample easily occurred during spark discharge atomic emission spectrometric determination when its wall thickness was less than 1 mm.
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