Aspects of Minimizing Steel Corrosion in Liquid Lead-Alloys by Addition of Oxygen

The concept of minimizing steel corrosion in liquid lead-alloys by addition of oxygen strongly depends on the availability of efficient devices for oxygen transfer and reliable oxygen sensors. The accuracy of electrochemical oxygen sensors is analyzed on the basis of theoretical considerations and results from experiments in stagnant lead-bismuth eutectic (LBE). Additionally, the feasibility of gas/liquid oxygen-transfer and the long-term performance of electrochemical sensors in flowing liquid metal are addressed based on operation of the CORRIDA loop, a facility for testing steels in flowing LBE.

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Design and testing of electrochemical oxygen sensors for service in liquid lead alloys

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2011.04.045 ◽

2011 ◽

Vol 415 (3) ◽

pp. 338-347 ◽

Cited By ~ 18

Author(s):

Carsten Schroer ◽

Juergen Konys ◽

Ariadna Verdaguer ◽

Jordi Abellà ◽

Alessandro Gessi ◽

...

Keyword(s):

Oxygen Sensors ◽

Liquid Lead ◽

Lead Alloys ◽

Design And Testing ◽

Electrochemical Oxygen

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A model for the prediction of the corrosion of steels in flowing liquid lead alloys

Journal of Nuclear Materials ◽

10.1016/s0022-3115(02)00821-8 ◽

2002 ◽

Vol 303 (2-3) ◽

pp. 240-241 ◽

Cited By ~ 3

Author(s):

H.U. Borgstedt ◽

C. Guminski

Keyword(s):

Liquid Lead ◽

Flowing Liquid ◽

Lead Alloys

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Gas/liquid oxygen-transfer to flowing lead alloys

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2010.06.047 ◽

2011 ◽

Vol 241 (5) ◽

pp. 1310-1318 ◽

Cited By ~ 24

Author(s):

Carsten Schroer ◽

Olaf Wedemeyer ◽

Juergen Konys

Keyword(s):

Oxygen Transfer ◽

Liquid Oxygen ◽

Lead Alloys

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Aspects of minimizing steel corrosion in liquid lead-alloys by addition of oxygen

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2011.09.002 ◽

2011 ◽

Vol 241 (12) ◽

pp. 4913-4923 ◽

Cited By ~ 22

Author(s):

Carsten Schroer ◽

Olaf Wedemeyer ◽

Juergen Konys

Keyword(s):

Steel Corrosion ◽

Liquid Lead ◽

Lead Alloys

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Steel corrosion in reinforced alkali-activated materials

RILEM Technical Letters ◽

10.21809/rilemtechlett.2017.39 ◽

2017 ◽

Vol 2 ◽

pp. 33-39 ◽

Cited By ~ 16

Author(s):

Shishir Mundra ◽

Susan A. Bernal ◽

Maria Criado ◽

Petr Hlaváček ◽

Gino Ebell ◽

...

Keyword(s):

Corrosion Behaviour ◽

Steel Corrosion ◽

Threshold Value ◽

Steel Reinforcement ◽

Solution Chemistry ◽

Phase Assemblage ◽

Long Term Performance ◽

Term Performance ◽

Alkali Activated

The development of alkali-activated materials (AAMs) as an alternative to Portland cement (PC) has seen significant progress in the past decades. However, there still remains significant uncertainty regarding their long term performance when used in steel-reinforced structures. The durability of AAMs in such applications depends strongly on the corrosion behaviour of the embedded steel reinforcement, and the experimental data in the literature are limited and in some cases inconsistent. This letter elucidates the role of the chemistry of AAMs on the mechanisms governing passivation and chloride-induced corrosion of the steel reinforcement, to bring a better understanding of the durability of AAM structures exposed to chloride. The corrosion of the steel reinforcement in AAMs differs significantly from observations in PC; the onset of pitting (or the chloride ‘threshold’ value) depends strongly on the alkalinity, and the redox environment, of these binders. Classifications or standards used to assess the severity of steel corrosion in PC appear not to be directly applicable to AAMs due to important differences in pore solution chemistry and phase assemblage.

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Optical Oxygen Sensors With Improved Lifetime Incorporating Titania Beads and Polydimethylsiloxane Coatings

Photonic Sensors ◽

10.1007/s13320-020-0608-z ◽

2020 ◽

Author(s):

Emily Cirulnick ◽

Haopeng Zhang ◽

David Klotzkin

Keyword(s):

Light Scattering ◽

Direct Measurement ◽

Optical Sensors ◽

Degradation Rate ◽

Low Cost ◽

Oxygen Sensors ◽

Oxygen Measurement ◽

Long Term Performance ◽

Term Performance

AbstractThe use of optical sensors for oxygen measurement is becoming more important because of their capability for low-cost and direct measurement, but as yet, little has been reported about their long-term performance. Phosphorescent sensors based on platinum octaethylporphyrin (PtOEP) embedded in polymer matrices tend to degrade with time. To reduce the rate of degradation, sensor films were fabricated and then coated with a layer of polydimethylsiloxane (PDMS) and tested in a six-month study. The PDMS-coated sensors showed an average degradation rate of ~0.073 %/day, compared to ~0.18 %/day for uncoated sensors. Titania beads were also incorporated into the films to increase light scattering and improve the response; these beads compensated to some degree for the absorption due to the PDMS films. The films with titania beads improved the response significantly (about 40%) compared to the films without titania beads. Incorporation of titania beads also moderately improved the aging characteristics.

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