Water-glycol type heat transfer medium with corrosion inhibition effect on galvanized pipe

Abstract

The invention relates to a water-glycol type heat transfer medium with a corrosion inhibition effect on a galvanized pipe. A corrosion inhibition component of the water-glycol type heat transfer medium comprises diphenolic acid, p-hydroxyphenylacetamide, tobias acid and 2, 4-dimethylthiazole. The brand-new heat transfer medium developed by the invention can significantly improve the corrosion inhibition protection capability of zinc, and has extremely significant zinc corrosion inhibition performance compared with existing similar coolant products.

Description

technical field [0001] The invention relates to a water-glycol type heat conduction medium capable of inhibiting corrosion of galvanized pipes. Background technique [0002] Galvanized pipe is a welded steel pipe with a hot-dip or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipes are widely used. In addition to being used as pipeline pipes for general low-pressure fluids such as water, gas, and oil, they are also often used as oil well pipes and oil pipelines in the petroleum industry, especially offshore oil fields, and oil heaters and condensation pipes for chemical coking equipment. Pipes for coolers, coal distillation washing oil exchangers, trestle piles, and support pipes for mine tunnels, etc. Due to the relatively low price of galvanized pipes, they are also widely used in engine cooling systems and industrial equipment heat transfer systems. However, when used ...

AI Technical Summary

Problems solved by technology

Due to the relatively low price of galvanized pipes, they are also widely used in engine cooling systems and industrial equipment heat transfer systems. However, when used in cooling heat transfer fluids containing ethylene glycol, there are often precipitated impurities due to corrosion of the galvanized layer. These The impurity is a mixture of zinc and iron. Ethylene glycol has a weak complexation effect on zinc ions. Ethylene glycol can be slowly oxidized into acid under heating conditions. Short-chain acids can corrode zinc and alloys, so galvanized pipes are There is a risk of corrosion when used in water-glycol systems

[0003] The existing water-ethylene glycol type heat transfer medium generally does not consider the corrosion inhibition of zinc. The existing cooling liquid often uses raw materials such as inorganic salts such as borax, nitrite, ammonium salts, phosphates, etc., and organic carboxylic acids such as decane. Diacid, isooctanoic acid, sodium benzoate, etc. have no corrosion inhibition effect on zinc and zinc alloys, and some have the disadvantage of being corrosive

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