Online monitoring and regulating method for chloride molten salt corrosion
A molten salt corrosion and chloride technology, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of high difficulty and difficult implementation of online monitoring of molten salt corrosion
Active Publication Date: 2020-05-12
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
[0008] The technical problem actually solved by the present invention is to overcome the defects of high difficulty and difficult implementation in online monitoring of molten salt corrosion in the prior art, and provide an online monitoring and control method for chloride molten salt corrosion
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Embodiment 1
[0068] The test device for the electrochemical steady-state polarization curve of molten salt corrosion is as described in published patents CN102553664A and CN108956744A. It is mainly composed of a glove box connected to a well-type furnace. The atmosphere in the furnace is connected to the glove box atmosphere. The glove box has a self-purifying function The inert atmosphere glove box, the sum of water and oxygen in the atmosphere in the box is controlled below 10ppm. Before the test, 300g of analytically pure MgCl 2 -NaCl-KCl molten salt (45.4%-33.0%-21.6% by mole) is mixed and placed in a corundum crucible, dried in a pit furnace for 48 hours at a temperature of 250°C, and then the mixed salt is heated and melted and kept at test temperature. Steady-state polarization curve test three electrodes are 316H stainless steel working electrode (φ1mm), glassy carbon rod (φ6mm) auxiliary electrode and NiCl 2 / Ni reference electrode. The reference electrode is: a pure nickel wir...
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Abstract
The invention discloses an online monitoring and regulating method for chloride molten salt corrosion. The method comprises the following steps: obtaining a polarization curve of a working electrode in molten salt to be tested under different addition amounts of magnesium metal by a corrosion electrochemical testing method; determining corrosion control indexes including corrosion potential, corrosion current density and linear polarization resistance; and detecting the corrosion potential, the corrosion current density and the linear polarization resistance of the molten salt to be tested online; monitoring the corrosivity of the molten salt to be tested on line, and when the corrosion index (corrosion potential, corrosion current density or linear polarization resistance) of the onlinedetection does not meet a molten salt corrosion control index, adding a proper amount of magnesium metal into the molten salt to be tested to enable the index of the online detection to reach the corrosion control index range, so that the online monitoring and regulation of the corrosion of the molten salt to be tested are realized.
Description
technical field [0001] The invention relates to an on-line monitoring and control method for chloride molten salt corrosion, in particular to an on-line monitoring and control method for alkali metal molten salt corrosion containing magnesium chloride. Background technique [0002] Molten chloride salts composed of alkali metal or alkaline earth metal chloride salts have the characteristics of good stability, high heat capacity and thermal conductivity, and wide operating temperature range, and are very competitive candidate media for solar heat collection. Researchers have carried out a lot of research work on chloride molten salts with different compositions from the perspectives of molten salt physical properties, thermal cycle stability, material compatibility, and comprehensive economics, and have screened out a chloride molten salt system with excellent comprehensive performance. . Among them, MgCl 2 -NaCl-KCl molten salt (45.4%-33.0%-21.6% molar percentage, the abbr...
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IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 左勇杨新梅申淼陈燕军汤睿刘华剑曹明鹏
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI