A Glycol-Water Based Coolant with Low Corrosion and Low Conductivity
A water-based coolant and ethylene glycol technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of serious corrosion, complex structure, complicated electrochemical mechanism, etc., so as to reduce usage and corrosion. Effect
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example 1
[0014] Example 1 When in 1 liter of ethylene glycol-water-based (volume ratio 65 / 35) solution, first add corrosion inhibitors: namely, ethanolamine phosphate 150mg / L, benzothiazole 150mg / L, mercaptobenzothiazole 150mg / L , 150 mg / L of polyvinylpyrrolidone compound, 100 mg / L of sodium borate, and 10 mg / L of +3-valent cerium nitrate were stirred and mixed. Second, hydroxymethylaminomethane was used as a buffer to adjust the pH of the ethylene glycol-water-based solution until the pH reached 8.5. Finally, 1.0 ml of methyl orange indicator solution was added, and the solution changed from colorless to bright brownish yellow, thus obtaining a cooling liquid. The test results show that the conductivity of the coolant is 90-95μS / cm; the average corrosion rate of copper, cast aluminum, aluminum alloy, and stainless steel is less than 0.1g / m when soaked in the coolant at 90°C for 14 days 2 .d. After the test, the pH value of the cooling liquid is 7.8-8.0; the corrosion of brass alloy ...
example 2
[0015] Example 2 In 1 liter of ethylene glycol-water-based (volume ratio 65 / 35) solution, first, add corrosion inhibitors: namely, ethanolamine phosphate 100mg / L, benzothiazole 200mg / L, mercaptobenzothiazole 200mg / L , Polyvinylpyrrolidone compound 100mg / L, sodium borate 200mg / L, +3-valent cerium nitrate 5mg / L. Second, the pH of the glycol-water-based coolant was adjusted using hydroxymethylaminomethane as a buffer until the pH reached 8.5. Finally, 1.0 ml of methyl orange indicator solution was added, and the solution changed from colorless to bright brownish yellow to obtain a cooling solution. The test results show that the conductivity of the coolant is ~90μS / cm; the average corrosion rate of aluminum alloy, solder, and stainless steel is less than 0.1g / m after being soaked in the coolant at 90°C for 14 days 2 .d. Corrosion of brass alloy is less than Example 1, less than 0.1g / m 2 .d; while corrosion pits appear on the surface of cast aluminum, the corrosion rate is 0.2g...
example 3
[0016] Example 3 In the ethylene glycol-water-based (volume ratio 65 / 35) solution, first, add a corrosion inhibitor, that is, ethanolamine phosphate 150mg / L, benzothiazole 200mg / L, polyvinylpyrrolidone compound 100mg / L, boric acid Sodium 150mg / L, +3 valent cerium nitrate 3mg / L. At the same time, change mercaptobenzothiazole to sodium mercaptobenzothiazole, and add at a concentration of 200mg / L. Second, the pH of the glycol-water-based coolant was adjusted using hydroxymethylaminomethane as a buffer until the pH reached 8.5. Finally, 1.0 ml of methyl orange indicator solution was added, and the solution changed from colorless to bright brownish yellow to obtain a cooling solution. The test results show that after changing mercaptobenzothiazole to mercaptobenzothiazole sodium, the amount of hydroxymethylaminomethane added is reduced by 1 / 3, and the conductivity of the coolant is 80-85μS / cm; after the test, the pH value of the coolant is 8.3 -8.4; Copper and its alloys, aluminu...
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