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A Corrosion Test Method for Redox Buffer Molten Salt System

A corrosion test, molten salt technology, applied in the direction of measuring devices, electrochemical variables of materials, instruments, etc., can solve the problems that are not suitable for corrosion evaluation of molten salt systems containing redox buffer ions

Active Publication Date: 2020-07-31
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem solved by the present invention is to overcome the defect that the existing Tafel (Tafel) polarization curve extrapolation method is not suitable for corrosion evaluation of molten salt systems containing redox buffer ion pairs, and provides a redox buffer molten salt Systematic Corrosion Test Methods

Method used

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  • A Corrosion Test Method for Redox Buffer Molten Salt System
  • A Corrosion Test Method for Redox Buffer Molten Salt System
  • A Corrosion Test Method for Redox Buffer Molten Salt System

Examples

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Effect test

Embodiment 1

[0160] Test 316L stainless steel (316LSS) containing 1000ppmCrF 3 and 600ppmCrF 2 Corrosion rate in FLiNaK molten salt. The test temperature is 600°C, the 316L stainless steel wire to be tested has a diameter of 1 mm, and is immersed in molten salt for 3 cm. The comparative inert metal electrode is a silver wire with a diameter of 1mm, immersed in molten salt for 3cm. Using the metal wire and the silver wire to be tested as the working electrodes respectively, at a scan speed of 0.5mV / s, scan 0.15V from the open circuit potential to the positive and negative directions to obtain two sets of anode and cathode polarization curves, as Figure 5 shown. Since the molten salt system contains CrF 2 / CrF 3 For buffer ion pairs, the classic Tafel extrapolation method is not applicable, and the method of the present invention is required to be tested. That is, in the anode strong polarization region (ΔE is about 0.13 ~ 0.15V), the polarization current obtained on the 316L stainles...

Embodiment 2

[0162] Test 304 stainless steel (304SS) containing 1000ppmCrF 3 and 800ppmCrF 2 Corrosion rate in FLiNaK molten salt. The test temperature is 600°C, the 304 stainless steel wire to be tested has a diameter of 1 mm, and is immersed in molten salt for 3 cm. The comparative inert metal electrode is a silver wire with a diameter of 1mm, immersed in molten salt for 3cm. Using the metal wire and the silver wire to be tested as the working electrodes respectively, at a scan speed of 0.5mV / s, scan 0.15V from the open circuit potential to the positive and negative directions to obtain two sets of anode and cathode polarization curves, as Figure 6 shown. Adopt the processing method similar to embodiment 1, obtain new lgi~ΔE curve, carry out linear fitting to this curve, the equation of the straight line that obtains is: y=11.69x-4.165 (R 2 =0.999), the corrosion current density of 304 stainless steel in the redox buffer molten salt system calculated from the intercept with the long...

Embodiment 3

[0164] Test Hastelloy C276 alloy containing 1000ppmCrF 3 and 800ppmCrF 2 Corrosion rate in FLiNaK molten salt. The test temperature is 600°C, the Hastelloy C276 metal wire to be tested has a diameter of 1 mm, and is immersed in molten salt for 3 cm. The comparative inert metal electrode is a silver wire with a diameter of 1mm, immersed in molten salt for 3cm. Using the metal wire and the silver wire to be tested as the working electrodes respectively, at a scan speed of 0.5mV / s, scan 0.15V from the open circuit potential to the positive and negative directions to obtain two sets of anode and cathode polarization curves, as Figure 7 shown. Adopt the processing method similar to embodiment 1, obtain new lgi~ΔE curve, carry out linear fitting to this curve, the equation of the straight line obtained is: y=3.142x-4.515, from the Hastelloy C276 that obtains with the vertical axis intercept calculation The corrosion current density of the alloy in the redox buffer molten salt s...

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Abstract

The invention discloses a corrosion test method for a redox buffered molten salt system. The method comprises: separately detecting a working electrode made of a metal to be tested and a working electrode prepared from an inert metal in a redox buffered molten salt system to obtain two sets of anodic polarization current curves, carrying out mathematical treatment on the data of the anodic polarization current curves through subtracting a polarization current iA of the working electrode made of the inert metal from the polarization current iA of the working electrode made of the metal to be tested to obtain an anodic polarization current iA, corr relates to corrosion, drawing a graph through lgiA, corr as vertical coordinates and polarization potential delta E as horizontal coordinates, carrying out linear fitting on the curve and calculating a corrosion current value icorr of the metal to be tested in the redox buffer molten salt system according to the fitting result. The corrosion test method can simply, fast and accurately test the corrosion resistance of the molten salt system containing a redox buffer ion pair.

Description

technical field [0001] The invention relates to a corrosion test method of redox buffer molten salt system. Background technique [0002] As a heat transfer and storage medium, molten salt has the characteristics of high working temperature, wide range, low pressure, and high specific heat capacity, and has received increasing attention in new energy fields such as nuclear energy and solar energy. Corrosion control of alloy materials by molten salt working fluid is a problem that must be faced in all related applications. Especially the fluorine salt or chloride salt working at 500-700°C, if its corrosion behavior is not properly controlled, it will pose a serious threat to the safe operation of the thermal system. At high temperature, in addition to the intrinsic corrosion drive of metal materials caused by the physical and chemical characteristics of the molten salt itself, the strong ionic conductivity of the molten salt medium provides very suitable external conditions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416G01N27/48
CPCG01N27/4168G01N27/48
Inventor 秦越强左勇申淼王建强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI