Compound corrosion inhibitor for corrosion medium and preparation method thereof

A technology of corrosion medium and corrosion inhibitor, applied in the field of compound corrosion inhibitor and its preparation, can solve the problems of low toxicity of tungstate, low corrosion inhibition efficiency, low environmental pollution, etc. Simple, easy to compound effects

Inactive Publication Date: 2011-06-29
中国人民解放军防化指挥工程学院
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Problems solved by technology

Molybdate has corrosion inhibition effect on copper and copper alloys, its toxicity is extremely low, and it has little environmental pollution. It is a promising inorganic salt environment-friendly corrosion inhibitor, but its cost is relatively high
The toxicity of tungstate is very low, there is almost no harm to the environment and human body, and it does not cause microbial growth. It is an environmentally friendly corrosion inhibitor. However, the single use of tungstate has low corrosion inhibition efficiency for copper, large dosage and high cost.
Thiourea and its derivatives are main...

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  • Compound corrosion inhibitor for corrosion medium and preparation method thereof
  • Compound corrosion inhibitor for corrosion medium and preparation method thereof
  • Compound corrosion inhibitor for corrosion medium and preparation method thereof

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preparation example Construction

[0047] The present invention proposes a preparation method of a composite corrosion inhibitor suitable for corrosive media, which specifically includes the following steps:

[0048] Step 1: Preparation of maleic anhydride octylamine corrosion inhibitor.

[0049] Dissolve maleic anhydride (maleic anhydride for short) and octylamine in a carbon tetrachloride organic solvent according to a molar ratio of 1:1 to 1:1.5 to obtain a maleic anhydride-carbon tetrachloride solution and octylamine-carbon tetrachloride solution. Under the condition of stirring, add the octylamine-carbon tetrachloride solution dropwise into the maleic anhydride-carbon tetrachloride solution, stir and react at 0-15°C for 3-4 hours, then let stand for 10- After 20 hours, the precipitate was filtered out with suction, washed with carbon tetrachloride organic solvent and dried to obtain a white solid powder that is a maleic anhydride octylamine corrosion inhibitor. The reaction equation is:

[0050]

[00...

Embodiment 1

[0060] The present invention proposes a method for preparing a composite corrosion inhibitor suitable for corrosive media, which specifically includes the following steps:

[0061] Step 1: Preparation of maleic anhydride octylamine corrosion inhibitor.

[0062] According to the ratio of 1:1, maleic anhydride 9.8g and octylamine 12.9g were dissolved in carbon tetrachloride organic solvent respectively to obtain maleic anhydride-carbon tetrachloride solution and octylamine-tetrachloride Carbon chloride solution. Under the condition of stirring, add the octylamine-carbon tetrachloride solution dropwise to the maleic anhydride-carbon tetrachloride solution, stir and react at 0°C for 3 hours, let it stand for 10 hours, and filter out The precipitate was washed with carbon tetrachloride organic solvent and dried to obtain a white solid powder that is maleic anhydride octylamine corrosion inhibitor.

[0063] Step 2: Preparation of oleic acid amide corrosion inhibitor.

[0064] Hea...

Embodiment 2

[0073] Step 1: Preparation of maleic anhydride octylamine corrosion inhibitor.

[0074]Dissolve maleic anhydride and octylamine in the carbon tetrachloride organic solvent according to the molar ratio of 1: 1.5 to obtain maleic anhydride-carbon tetrachloride solution and octylamine-carbon tetrachloride solution . Under the condition of stirring, add the octylamine-carbon tetrachloride solution dropwise to the maleic anhydride-carbon tetrachloride solution, stir and react at 15°C for 4 hours, let it stand for 20 hours, and filter out The precipitate was washed with carbon tetrachloride organic solvent and dried to obtain a white solid powder that is maleic anhydride octylamine corrosion inhibitor.

[0075] Step 2: Preparation of oleic acid amide corrosion inhibitor.

[0076] Heat oleic acid to 150°C under the protection of nitrogen, add maleic anhydride in an equimolar amount to oleic acid under stirring conditions, then add KOH catalyst, and react at 190°C for 4 hours. The a...

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Abstract

The invention provides a compound corrosion inhibitor for a corrosion medium. The compound consists of the following components in percentage by mass: 10 to 75 percent of maleated maleic anhydride, 10 to 75 percent of oleamide corrosion inhibitor, 10 to 75 percent of sodium molybdate corrosion inhibitor, and 5 to 50 percent of benzotriazole (BTA) corrosion inhibitor. The compound corrosion inhibitor for the corrosion medium is particularly suitable for a neutral and alkaline corrosion medium, and can simultaneously and effectively inhibit the corrosion of carbon steel and copper alloy in the neutral and alkaline medium. The method for preparing the compound corrosion inhibitor is simple, and the synergy effect ensures that dosage of each corrosion inhibitor in the compound corrosion inhibitor is remarkably reduced compared with that of single use of the corrosion inhibitor, so that the production cost is lower; and the compound corrosion inhibitor is an environmentally friendly corrosion inhibitor, so that normal operation of the equipment cannot be influenced.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, and in particular relates to a composite corrosion inhibitor suitable for corrosive media and a preparation method thereof. Background technique [0002] Corrosion inhibitors are substances that are added to corrosive media to significantly reduce the corrosion rate of metals. Because of their small dosage (a few parts per million to a few parts per thousand), low prices, wide sources, good effects, and strong versatility, It occupies an important position in various metal protection methods (see reference (1): Li Xianghong, Qu Qing, Jiang Shuan, etc. The adsorption of rare earth ions and ligands on steel and aluminum surfaces and their synergistic mechanism of corrosion inhibition. Chinese Science Foundation , 2006, 2:99-103). Corrosion inhibitors can be divided into inorganic and organic according to their chemical composition. Inorganic corrosion inhibitors are oxides that promo...

Claims

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Application Information

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IPC IPC(8): C23F11/08C23F11/06
Inventor 梁婷孙杰顾进姬壮周阎瑞任洪春
Owner 中国人民解放军防化指挥工程学院
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