Abstract：Monel alloy is a kind of special corrosion resistant alloy based on nickel and copper, and the typical composition is 67% Ni-30% Cu. The current standard method GB/T 21931.1-2008 <Nickel, ferronickel and nickel alloys-Determination of carbon content-Infrared absorption method after induction furnace combustion> has some problems, such as unclear analysis conditions and the phenomenon of melt splash in test. Therefore, the determination method of carbon content in Monel alloy was studied by the high frequency induction combustion-infrared absorption spectroscopy was studied. The effect of flux and sample mass on the determination of carbon was investigated. The methodological evaluation was carried out from the aspects including limit of detection, precision and recovery. Then a special method suitable for the determination of carbon content in Monel alloy was established. The optimum analysis conditions were obtained as follows: 0.20-0.30g of sample was weighed and transferred into ceramic crucible; 1.5-2.0g of granular tungsten was added as flux; the analyzer was calibrated using certified reference material of steel; the linear correlation coefficient of the calibration curve was r=0.999. The limit of detection was 0.001% and the limit of quantification was 0.003%. The proposed method was applied to the determination of carbon in actual samples of Monel K500 and Monel 400. The relative standard deviation (RSD, n=8) of determination results was less than 3%. The recovery tests of carbon were conducted by adding certified reference material of steel. The recoveries were between 92% and 106%. The results of proposed method were consistent with GB/T 21931.1-2008.
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