China Nonferrous Metallurgy

Gold nickel chromium iron silicon boron alloys is a kind of excellent brazing material, which is widely used in aerospace field. It is of great significance to establish an accurate, simple and rapid detection method for guaranteeing the properties of gold-nickel-chromite ferrosilicon-boron alloy powders.The existing GB/T 39138.20—2020 has strict requirements on dissolution conditions and is difficult to master. In this paper, a sample of 0.2g alloy powder was measured and dissolved by HNO3-HCl-HF with sealed-digestion at 140℃±10℃ and dilute solution 60min and boric acid complex excess HF. The contents of chromium, iron and silicon were determined simultaneously by inductively coupled plasma optical emission spectrometry (ICP-OES). It is selection wavelength Cr284.325,Fe238.204,Si288.158 to result computation. The results were same with GB/T 39138.20—2020，the results adding standard recovery was 97.2%~101.1%, the results ofrelative standard deviationwas 0.97%~1.41%.The experimental data show that the method is reliable. This method overcomes the defects of the current national standard method with strict dissolution conditions,makes the dissolution more complete, avoids the loss of silicon content, and reduces the difficulty of sample pretreatment.It is an easy to master,high accuracy and environmentally friendly analysis method.