Corrosion Characterization of Iron-Based High-Performance Amorphous-Metal Thermal-Spray Coatings

Farmer, Joseph C.; Haslam, J; Day, S D; Branagan, D. J.; Blue, Craig A.; Rivard, John D. K.; Aprigliano, L; Yang, Nancy Y. C.; Perepezko, John H.; Beardsley, Megan

doi:10.1115/pvp2005-71664

Cited by 12 publications

(9 citation statements)

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“…[34][35][36] The materials in this alloy have exceptional neutron-absorption characteristics and are stable at a high dose. The absorption cross section in transmission for thermal neutrons for SAM2X5 coatings is 3 to 4 times greater than that of borated stainless steel, and twice as good as the Ni-based alloy C-4 with additions of Gd (Ni-Cr-MoGd).…”

Section: A Safe Storage Of Snfmentioning

confidence: 99%

Iron-Based Amorphous Metals: High-Performance Corrosion-Resistant Material Development

Farmer

Choi

Saw

et al. 2009

Metall Mater Trans A

142

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An overview of the High-Performance Corrosion-Resistant Materials (HPCRM) Program, which was cosponsored by the Defense Advanced Research Projects Agency (DARPA) Defense Sciences Office (DSO) and the U.S. Department of Energy (DOE) Office of Civilian and Radioactive Waste Management (OCRWM), is discussed. Programmatic investigations have included a broad range of topics: alloy design and composition, materials synthesis, thermal stability, corrosion resistance, environmental cracking, mechanical properties, damage tolerance, radiation effects, and important potential applications. Amorphous alloys identified as SAM2X5 (Fe 49.7 Cr 17.7 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 ) and SAM1651 (Fe 48 Mo 14 Cr 15 Y 2 C 15 B 6 ) have been produced as meltspun ribbons (MSRs), dropcast ingots, and thermal-spray coatings. Chromium (Cr), molybdenum (Mo), and tungsten (W) additions provided corrosion resistance, while boron (B) enabled glass formation. Earlier electrochemical studies of MSRs and ingots of these amorphous alloys demonstrated outstanding passive film stability. More recently, thermal-spray coatings of these amorphous alloys have been made and subjected to long-term saltfog and immersion tests; good corrosion resistance has been observed during salt-fog testing. Corrosion rates were measured in situ with linear polarization, while the open-circuit corrosion potentials (OCPs) were simultaneously monitored; reasonably good performance was observed. The sensitivity of these measurements to electrolyte composition and temperature was determined. The high boron content of this particular amorphous metal makes this amorphous alloy an effective neutron absorber and suitable for criticality-control applications. In general, the corrosion resistance of such iron-based amorphous metals is maintained at operating temperatures up to the glass transition temperature. These materials are much harder than conventional stainless steel and Ni-based materials, and are proving to have excellent wear properties, sufficient to warrant their use in earth excavation, drilling, and tunnel-boring applications. Large areas have been successfully coated with these materials, with thicknesses of approximately 1 cm. The observed corrosion resistance may enable applications of importance in industries such as oil and gas production, refining, nuclear power generation, shipping, etc.

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Section: A Safe Storage Of Snfmentioning

confidence: 99%

Iron-Based Amorphous Metals: High-Performance Corrosion-Resistant Material Development

Farmer

Choi

Saw

et al. 2009

Metall Mater Trans A

142

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“…On the other hand, Fe-based amorphous alloys have even higher localized corrosion resistance than Alloy C-22 [8]. Since the iron based amorphous alloys are more economical to produce than the highly corrosion resistant nickel based alloys, its use seems attractive just for economical reasons.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Rebak

Day

Lian

et al. 2007

Volume 7: Operations, Applications and Components

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Iron-based amorphous alloys possess enhanced hardness and are highly resistant to corrosion, which make them desirable for wear applications in corrosive environments. It was of interest to examine the behavior of amorphous alloys during anodic polarization in concentrated salt solutions and in the salt-fog testing. Results from the testing of one amorphous material (SAM2X5) both in ribbon form and as an applied coating are reported here. Cyclic polarization tests were performed on SAM2X5 ribbon as well as on other nuclear engineering materials. SAM2X5 showed the highest resistance to localized corrosion in 5 M CaCl 2 solution at 105°C. Salt fog tests of 316L SS and Alloy 22 coupons coated with amorphous SAM2X5 powder showed resistance to rusting. Partial devitrification may be responsible for isolated pinpoint rust spots in some coatings.

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“…One of the most promising formulations within this family was found to be Fe 49.7 Cr 17.7 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 (SAM2X5), which included chromium (Cr), molybdenum (Mo), and tungsten (W) for enhanced corrosion resistance, and boron (B) to enable glass formation and neutron absorption [11][12][13][14][15] Figure 1. These new iron-based amorphous metals have exceptional neutron absorption characteristics, and are stable at high dose.…”

Section: Introductionmentioning

confidence: 99%

Criticality-Control Applications in the Nuclear Industry for Thermal Spray Amorphous Metal and Ceramic Coatings

Farmer¹,

Choi²

2007

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Amorphous metal and ceramic thermal spray coatings have been developed that can be used to enhance the corrosion resistance of containers for the transportation, aging and disposal of spent nuclear fuel and high-level radioactive wastes. Iron-based amorphous metal formulations with chromium, molybdenum and tungsten have shown the corrosion resistance believed to be necessary for such applications. Rare earth additions enable very low critical cooling rates to be achieved. The boron content of these materials, and their stability at high neutron doses, enable them to serve as high efficiency neutron absorbers for criticality control. The high boron content of Fe 49.7 Cr 17.7 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 (SAM2X5) makes it an effective neutron absorber, and suitable for criticality control applications. Average measured values of the neutron absorption cross section in transmission (Σ t ) for Type 316L stainless steel, Alloy C-22, borated stainless steel, a Ni-Cr-Mo-Gd alloy, and SAM2X5 have been determined to be approximately 1.1, 1.3, 2.3, 3.8 and 7.1 cm -1 , respectively.

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Corrosion Characterization of Iron-Based High-Performance Amorphous-Metal Thermal-Spray Coatings

Cited by 12 publications

References 0 publications

Iron-Based Amorphous Metals: High-Performance Corrosion-Resistant Material Development

Iron-Based Amorphous Metals: High-Performance Corrosion-Resistant Material Development

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Criticality-Control Applications in the Nuclear Industry for Thermal Spray Amorphous Metal and Ceramic Coatings

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