A Ti35 Titanium Alloy Resistant to Nitric Acid Corrosion

Abstract

The invention discloses a Ti35 titanium alloy resistant to nitric acid corrosion, which is characterized in that it consists of the following components in mass content: 5.5%-6.5% of tantalum, 0.07%-0.15% of oxygen, and the balance is titanium and unavoidable impurities. The Ti35 titanium alloy of the present invention controls the mass content of tantalum to 5.5% to 6.5%, while taking into account the low cost of the material, it ensures that the Ti35 titanium alloy has a stable and reliable low corrosion rate; at the same time, oxygen is added to the titanium alloy as an interstitial atom Neutralize and control the mass content of oxygen at 0.07% to 0.15%, effectively increasing the tensile strength of Ti35 titanium alloy to more than 350MPa, and maintaining the elongation of Ti35 titanium alloy at more than 25%, thus effectively controlling the strong plasticity of Ti35 titanium alloy , the method is simple and convenient for industrial application.

Description

technical field [0001] The invention belongs to the field of nonferrous metal alloy materials, and in particular relates to a Ti35 titanium alloy resistant to nitric acid corrosion. Background technique [0002] The spent fuel produced by nuclear power plants is reprocessed into nuclear fuel for recycling, which can effectively reduce the emission and pollution of radioactive substances and improve the utilization rate of uranium resources. The internationally accepted Purex reprocessing process is a chemical process that uses nitric acid to dissolve fuel pellets, remove nuclear fission products, and recover nuclear fuel. In the high temperature concentrated nitric acid with radiation, the service environment is extremely harsh, which puts forward extremely high requirements on the mechanical properties, process properties and corrosion resistance of equipment materials. [0003] Generally, stainless steel materials will be corroded due to intergranular chromium deficiency ...

AI Technical Summary

Problems solved by technology

[0004] The KS50Ta (Ti-5Ta) alloy developed by Kobe Steel, Japan, enhances the corrosion resistance of industrial pure titanium by adding 4wt% to 6wt% tantalum to pure titanium. The annual average of the alloy in boiling nitric acid solution The corrosion rate is 0.1-0.2mm / a, the tensile strength is 330MPa, and the elongation is 23%. The disadvantages are that the strength and plasticity are not high, and the corrosion resistance is slightly poor.

[0005] Japan's Kobe Steel Institute Sho 61-42473 discloses a Ti-Ta-Si alloy with excellent nitric acid corrosion resistance, which is added by adding 1% to 6% of tantalum and 0.01% to 0.5% of Silicon, forming a ternary corrosion-resistant titanium alloy, inhibits the corrosion of Ti-Ta-based alloys by adding a small amount of silicon, but the inhibitory effect is limited, and the addition of silicon will affect the plasticity and processability of Ti-Ta-based materials. adversely affect

[0006] The invention patent with the patent number ZL95101399.8 discloses a 550MPa grade nitric acid corrosion-resistant titanium alloy, which is added by adding 3% to 7% of tantalum, 0.1% to 0.7% of aluminum and 0.2% to 0.6% of titanium to titanium. molybdenum, forming a quaternary corrosion-resistant titanium alloy, its strength is increased to 550MPa, the corrosion rate reaches 0.1mm / a, but the elongation is only 23%, and the plasticity of the material needs to be further improved

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