Prophecies of Language

Mendicino, Kristina

doi:10.1515/9780823274048

Cited by 1 publication

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“…When the temperature of pure water is increased from the ambient to higher values the conductivity starts increasing, the resistivity and viscosity of water decrease and therefore, current can flow more easily. The main reason for this phenomenon is the dissociation of water molecules and increase in the number of ions (H 3 O + /OH – ) . Here it is worth noting that by increasing the temperature of pure water to ~270 °C (at P 25 MPa) the water dissociation constant decreases, pH shifts toward more acidic values and the conductivity increases.…”

Section: Introductionmentioning

confidence: 94%

Water chemistry, solution resistivity, and oxygen reduction reaction in simulated primary coolant of pressurized water reactors

Zhang

Arjmand

2019

Materials & Corrosion

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The effect of temperature (25°C-300°C) on the ohmic potential drop (ΔE Ω ) and resistivity (R sol ) of a simulated primary coolant of the pressurized water reactors was investigated using electrochemical impedance spectroscopy (EIS) and galvanostatic potentiometry. The variations in the conductivity and pH of the solution showed that by increasing the temperature the magnitude of the R sol and therefore ΔE Ω of the system first decreases rapidly (until~150°C) and then reaches a relatively stable plateau value. Increasing the pressure of the system decreased the magnitude of the R sol in the oxygenated coolant. Investigation of the oxygen reduction reaction (ORR) on platinum (Pt), 316L stainless steel (SS), Alloy 690, and carbon steel revealed the great effect of water chemistry, in particular pH on the rate of the ORR on these materials. OH − adsorption on Pt reduced the rate of the ORR on this metal at temperatures higher than~100°C. Finally, it was found that higher H 3 O + concentrations reduce the rate of the ORR on iron-and nickel-based alloys, while increasing the OH − concentration at temperatures higher thañ 150°C accelerates the rate of the ORR on these alloys. K E Y W O R D Shigh-temperature water, iR compensation, primary coolant, solution resistivity

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Section: Introductionmentioning

confidence: 94%