Organic corrosion inhibitor for inhibiting magnesium alloy corrosion and its application method in automobile coolant or corrosive aqueous solution

Abstract

The invention discloses an organic corrosion inhibitor for inhibiting magnesium alloy corrosion and an application method of the organic corrosion inhibitor in an automobile cooling liquid or a corrosion aqueous solution. The corrosion inhibitor consists of the components in percentage by weight: 10-90 percent of pyrazine or / and piperazine and 10-90 percent of water or / and ethanol. According to the application method, the corrosion inhibitor is added into the automobile cooling liquid or the corrosion aqueous solution which immerses a magnesium alloy according to an adding amount of 50-1,000 ppm under a condition at the temperature of -50-90 DEG C. The using amount of the corrosion inhibitor disclosed by the invention is small; the corrosion inhibitor is high in corrosion inhibition efficiency and good in corrosion inhibition effect; under normal temperature, the corrosion inhibition rate can be over 90 percent. The corrosion inhibitor is organic, so that the common shortcomings of an inorganic corrosion inhibitor are overcome; the application temperature range is wide; the organic corrosion inhibitor is applicable to low temperature and normal temperature and can still effectively inhibit corrosion of the magnesium alloy in a solution medium with higher temperature, and the corrosion inhibition rate can be over 80 percent under the higher temperature. The corrosion inhibitor product disclosed by the invention has the advantages of simplicity in production, wide application range, no toxicity, no peculiar smell, complete water solubility, safety and convenience in operation, good economical property and the like.

Description

technical field [0001] The invention relates to the anticorrosion technology of metal materials, in particular to an organic corrosion inhibitor for inhibiting the corrosion of magnesium alloys and its application method in automobile cooling fluid or corrosive aqueous solution. Background technique [0002] Magnesium and magnesium alloys are engineering materials with low density, high strength, strong ability to absorb plastic deformation and mechanical vibration, and good electromagnetic shielding ability. Therefore, magnesium alloys are used in automobiles, aerospace, electronics, and communications The application in such fields is increasing day by day, and it is known as the 21st century green engineering metal structure material. However, the standard electrode potential of magnesium is extremely low, the chemical properties and electrochemical activity of magnesium alloy are very high, and the oxide film of magnesium is loose and porous, which has almost no protecti...

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Problems solved by technology

[0004] At present, there are very few studies on the corrosion inhibition of magnesium alloys in solution. Therefore, it is extremely necessary to carry out research on the corrosion of magnesium alloys in solution and develop economical, effective and easy-to-use corrosion inhibitors.

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