Comparative Study on the Corrosion Resistance of Fe-Based Amorphous Metal, Borated Stainless Steel and Ni-Cr-Mo-Gd Alloy
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0985-NN08-07
Comparative Study on the Corrosion Resistance of Fe-Based Amorphous Metal, Borated Stainless Steel and Ni-Cr-Mo-Gd Alloy Tiangan Lian, Daniel Day, Phillip Hailey, Jor-Shan Choi, and Joseph Farmer Lawrence Livermore National Laboratory, Livermore, CA, 94550 ABSTRACT Iron-based amorphous alloy Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 was compared to borated stainless steel and Ni-Cr-Mo-Gd alloy on their corrosion resistance in various high-concentration chloride solutions. The melt-spun ribbon of this iron-based amorphous alloy have demonstrated a better corrosion resistance than the bulk borated stainless steel and the bulk Ni-Cr-Mo-Gd alloy, in high-concentration chloride brines at temperatures 90ºC or higher.
INTRODUCTION Amorphous, or glassy, metals have demonstrated unique structural, mechanical, electronic, magnetic, and corrosion properties as compared to conventional engineering metals. These amorphous or glassy metals can be produced only under rapid cooling that retains a disordered structure resembling a glass, and these metals are chemically and structurally homogeneous [1]. Recent development of Fe-based amorphous metals aims to enhance the corrosion resistance of key components in the waste packages for the transportation and long-term storage of spent nuclear fuel [2]. The Fe-based amorphous metal coatings, applied by high-velocity oxy-fuel (HVOF) thermal spray process, can provide a highly dense corrosion resistant outer layer. In the future, it may be possible to substitute such high-performance iron-based materials for more expensive nickel-based alloys, thereby enabling cost savings in a wide variety of industrial applications. Of the several Fe-based amorphous metals, SAM2X5 has demonstrated promising corrosion resistance. SAM2X5 has a composition of Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4, and its high B content makes it a good neutron absorbing structural material. This is particularly important to the criticality control of spent nuclear fuels (SNF) in the interim storage, transportation, and disposal containers in long-term geological repository. In current design, borated stainless steel is considered as inserts for nuclear criticality control. Boron (B) and gadolinium (Gd) are potent neutron absorbers that can potentially provide the nuclear criticality safety required for interim storage, transport, and final disposal of spent nuclear fuel [3]. B or Gd could be incorporated into an alloy that can be fabricated into baskets to provide structural support, corrosion resistance, and nuclear criticality control [4]. With its high B content, SAM2X5 coating on stainless steel can effectively provide structural metal an excellent neutron absorbing capability, and a good corrosion resistance under the projected storage conditions. The development of SAM2X5 applications has progressed significantly. To date, several engineering processes have been successfully developed for atomization, powder production, and HVOF spray coating. Other corrosion studies of SAM2X5 coated coupons, rods, c
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