| In order to improve the heat exchange efficiency of the electronic system,reduce the risk of corrosion damage to the liquid-cooled circulation system,and provide theoretical support for promoting domestic coolant to replace the Russian-made coolant.Therefore,for the newly developed BH coolant,the performance evaluation study under the liquid cooling cycle system is carried out.First,the low corrosion performance of the coolant was evaluated through standard experiments and durability tests of environmental simulation.Secondly,using electrochemical technology,the corrosion mechanism of aluminum alloy in BH coolant was studied.Finally,numerical simulation is used to simulate the typical fluid mechanics field in the liquid-cooled circulation system,and the influence of fluid mechanics parameters on corrosion is studied.At the same time,the corrosion prediction of the coupling parts that may occur galvanic corrosion in the liquid cooling circulation system is carried out.Under static conditions,the corrosion rates of 12 metals such as brass and copper in the BH coolant are significantly lower than the active AF65 coolant.Under flow conditions,the corrosion rates of six metals such as brass and copper in the glycol aqueous solution all increase with the increase of the flow rate.However,in the newly developed BH coolant containing corrosion inhibitors,the corrosion rate of six metals such as brass and copper slowly increases with the increase in flow rate,maintaining low corrosivity.Compared with the current AF65 coolant,when the flow velocity is 2m/s,3.5m/s,the average corrosion rate of 6 kinds of metals such as copper and brass in the BH coolant is about 66%lower than that of the AF65 coolant.,72%,showing excellent low corrosion performance.Electrochemical polarization studies show that under static conditions,with the increase of the immersion time of No.2 aluminum alloy and No.6 aluminum alloy in the coolant,the polarization resistance of No.2 aluminum alloy and No.6 aluminum alloy in the BH coolant Increased,about 5 times that in AF65 cooling liquid;Under flow conditions,the polarization resistance of No.2 aluminum alloy and No.6 aluminum alloy in BH cooling liquid is about 1.5 times that of AF65 cooling liquid,further explaining BH Coolant has excellent low corrosion performance.Electrochemical impedance spectroscopy results show that the impedance characteristics of No.2 aluminum alloy and No.6 aluminum alloy in BH coolant and AF65 coolant are similar,and both can be described by two time constants.After immersing for 120 hours,in the BH coolant,the fitting value of R1 for No.2 aluminum alloy and No.6 aluminum alloy is much higher than that of the AF65 coolant,which is about 616 and 4270 times the fitting value of R1 in the AF65 coolant.It proves once again that the BH coolant has a good corrosion inhibition effect on the two aluminum alloys.The simulation results show that the shape of the pipe in the liquid-cooled circulation system will cause a huge change in the flow field distribution in the pipe,which will affect the corrosion of the pipe material.In straight pipes,the inlet and outlet of the pipe are the most corroded parts.In the elbow,the severely corroded parts are the pipe entrance and the 30° to 90° elbow.When the coupling of No.2 aluminum alloy and copper pipes in BH coolant occurs galvanic corrosion,the degree of corrosion is affected by the connection method,the size of the pipe diameter and the flow rate of the coolant medium.10 days after the galvanic corrosion occurred,the corrosion distance of No.2 aluminum alloy pipe in BH coolant was 71.7mm,the corrosion distance after 20 days was 79.4mm,and the corrosion distance after 30 days was only 81.8mm.Compared with AF coolant,the corrosion distance is shortened by about 87%,which proves that BH coolant also has a good inhibitory effect on the occurrence of galvanic corrosion of aluminum and copper alloys. |
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