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CN-117604530-B - Corrosion prevention method for realizing accurate release of corrosion inhibitor by intelligent self-sensing

CN117604530BCN 117604530 BCN117604530 BCN 117604530BCN-117604530-B

Abstract

The invention discloses an anti-corrosion method for realizing accurate release of a corrosion inhibitor by intelligent self-perception, which comprises the following steps of firstly, reacting styrene with NaOH under the action of an initiator to obtain a Ps microsphere dispersion liquid, secondly, dissolving CTAB into an alcohol water solution, adding the Ps microsphere dispersion liquid, saturated ammonia water and tetraethyl silicate, centrifugally washing, drying and calcining to obtain porous hollow SiO 2 microsphere powder, thirdly, adding hollow SiO 2 and 3-aminopropyl triethoxysilane into absolute ethyl alcohol to obtain SiO 2 -NH 2 , fourthly, adding a diselenide into SiO 2 -NH 2 particles and toluene, centrifuging, washing and drying in vacuum to obtain SiO 2 -NH-DSe, fifthly, dipping benzotriazole into SiO 2 -NH-DSe, and drying to obtain a functionalized hollow SiO 2 microsphere loaded with BTA. The method utilizes the stimulus responsiveness of the diselenide bond to Fe 3+ to effectively combine the accurate release and the anti-corrosion passivation, so that the steel plate has excellent anti-corrosion performance.

Inventors

  • LIU YUYAN
  • Li Kaka
  • KANG SIBO
  • LIN ZHENXING
  • ZHANG DONGJIE
  • XIE ZHIMIN
  • CHENG ZHONGJUN
  • JIANG JIANMING

Assignees

  • 哈尔滨工业大学
  • 海洋化工研究院有限公司

Dates

Publication Date
20260508
Application Date
20231124

Claims (8)

  1. 1. An anti-corrosion method for realizing accurate release of a corrosion inhibitor by intelligent self-sensing is characterized by comprising the following steps: Step one, mixing 10 g styrene with 10-50 g of NaOH solution with the concentration of 10-20wt%, standing, separating liquid, reacting the standing styrene in a water bath at 60-80 ℃ for 8-24 h, and polymerizing the styrene under the action of 0.1-0.5 g of initiator to obtain a Ps microsphere dispersion; Dissolving 0.5-2 g of CTAB into an alcohol aqueous solution, pouring 50-100 g of Ps microsphere dispersion liquid, mechanically stirring, adding 5-12.5 ml of saturated ammonia water, dropwise adding 10-30 ml of tetraethyl silicate after 1-5 min, keeping stirring, centrifugally washing the prepared silica-coated polystyrene microsphere after reacting for 20-30 h, drying in a drying box, taking out a white powder sample, placing the white powder into a crucible, heating to 500-800 ℃ at a rate of 1-5 ℃ per min in a muffle furnace, and slowly cooling to room temperature after heat preservation and calcination for 1-3 h to obtain porous hollow SiO 2 microsphere powder; Adding 30-80 ml of absolute ethyl alcohol into a three-mouth bottle of 250 ml, then adding 0.5-1.5 g of hollow SiO 2 and 0.5-1 ml of 3-aminopropyl triethoxysilane, heating in an oil bath at 40-60 ℃, reacting for 10-15 h, washing the product with absolute ethyl alcohol after the reaction is finished, and vacuum drying the product to obtain a product SiO 2 -NH 2 ; Step four, adding 0.5-1.5 g of SiO 2 -NH 2 particles and 20-60 ml of toluene into a three-mouth bottle, adding 0.25-1 ml of diselenide, heating in an oil bath to 60-80 ℃, and reacting for 20-30 h; And fifthly, soaking 0.5-2 g of corrosion inhibitor benzotriazole into 1-3 g of SiO 2 -NH-DSe by using a vacuum soaking method, then placing into an oven for drying and evaporating the solvent, and drying to obtain the BTA-loaded functional hollow SiO 2 microsphere.
  2. 2. The method for realizing precise release of corrosion inhibitor by intelligent self-perception according to claim 1, wherein in the first step, the initiator is azobisisobutyronitrile or ammonium persulfate.
  3. 3. The method for realizing the precise release of the corrosion inhibitor by intelligent self-perception according to claim 1, wherein in the second step, the alcohol water volume ratio is 12/2.
  4. 4. The anti-corrosion method for realizing accurate release of corrosion inhibitors by intelligent self-perception according to claim 1, wherein in the second step, the addition amount of ammonia water is 7.5mL.
  5. 5. The anti-corrosion method for realizing accurate release of corrosion inhibitors by intelligent self-perception according to claim 1 is characterized in that in the second step, the mechanical stirring time is 10-60 min, the dripping rate of tetraethyl silicate is 5-12 d/min, and the drying time is 10-15 h.
  6. 6. The anti-corrosion method for realizing accurate release of corrosion inhibitors by intelligent self-perception according to claim 1, wherein in the third step, the temperature of vacuum drying is 30-50 ℃ and the time is 10-15 h.
  7. 7. The anti-corrosion method for realizing accurate release of corrosion inhibitors by intelligent self-perception according to claim 1, wherein in the fourth step, the time of vacuum drying is 20-30 hours.
  8. 8. The anti-corrosion method for realizing accurate release of corrosion inhibitors by intelligent self-perception according to claim 1, wherein in the fifth step, the drying temperature is 40-80 ℃ and the time is 10-15 h.

Description

Corrosion prevention method for realizing accurate release of corrosion inhibitor by intelligent self-sensing Technical Field The invention relates to a method for realizing intelligent self-sensing and corrosion inhibitor accurate release for corrosion prevention by utilizing double selenium bond (-Se-Se-) modification, in particular to a method for realizing intelligent self-sensing and corrosion inhibitor accurate release for corrosion prevention by utilizing Fe 3+. Background Corrosion is a huge threat commonly faced by countries around the world, causes serious economic loss to human society, and has important scientific and practical significance for researching corrosion protection. Coating technology is a common corrosion protection means. However, the coating technology suffers from a common problem in that once the coating is destroyed, the corrosive medium can penetrate directly to the metal substrate, losing its corrosion protection. The corrosion inhibitor is loaded into the nano container and then introduced into the coating, so that the service life of steel can be effectively prolonged. However, as the surface of the nano container is not functionalized, the release of the corrosion inhibitor is easy to be out of control, so that the barrier property, the adhesive force and the corrosion resistance of the coating are reduced, and the corrosion inhibitor fails in advance, thereby accelerating the corrosion rate of metal. The surface of the nano container is required to be modified, so that the corrosion inhibitor is accurately released in a corrosion area and is subjected to corrosion prevention and passivation. Disclosure of Invention In order to solve the technical problem of controllable release of the corrosion inhibitor in the existing anti-corrosion coating, the invention provides an anti-corrosion method for realizing accurate release of the corrosion inhibitor by intelligent self-perception. The method utilizes the stimulus responsiveness of the diselenide bond to Fe 3+ to effectively combine the accurate release and the anti-corrosion passivation, so that the steel plate has excellent anti-corrosion performance. The invention aims at realizing the following technical scheme: An anti-corrosion method for realizing accurate release of a corrosion inhibitor by intelligent self-sensing comprises the following steps: mixing and stirring 10g of styrene and 10-50 g of NaOH solution with the concentration of 10-20wt%, standing, separating liquid, reacting the refined styrene in a water bath at 60-80 ℃ for 8-24 h, and polymerizing the styrene under the action of 0.1-0.5 g of initiator (azodiisobutyronitrile (AIBN) or ammonium persulfate) to obtain Ps microsphere dispersion; Dissolving 0.5-2 g of cetyltrimethylammonium bromide (CTAB) into an alcohol-water solution (the alcohol-water ratio is 13/1-11/3, such as 13/1, 12/2 and 11/3), pouring 50-100 g of Ps microsphere dispersion liquid, mechanically stirring for 10-60 min, adding 5-12.5 ml of saturated ammonia water, dropwise adding 10-30 ml of tetraethyl silicate after 1-5 min, dropwise adding the mixture into a beaker at the rate of 5-12 d/min, keeping stirring, reacting for 20-30 h, centrifugally washing the prepared silica coated polystyrene microsphere, drying for 10-15 h in a drying box, taking out a white powder sample, placing the white powder into a crucible, heating the white powder in a muffle furnace at the rate of 1-5 ℃ from room temperature to 500-800 ℃, keeping the temperature, calcining for 1-3 h, and slowly cooling to the room temperature to obtain porous hollow SiO 2 microsphere powder; Adding 30-80 ml of absolute ethyl alcohol into a 250ml three-mouth bottle, then adding 0.5-1.5 g of hollow SiO 2 and 0.5-1 ml of 3-aminopropyl triethoxysilane, heating in an oil bath at 40-60 ℃ for reacting for 10-15 h, washing the product with absolute ethyl alcohol after the reaction is finished, and drying the product in a vacuum oven at 30-50 ℃ for 10-15 h to obtain a product SiO 2-NH2; Step four, adding 0.5-1.5 g of SiO 2-NH2 particles and 20-60 ml of toluene into a three-mouth bottle, adding 0.25-1 ml of diselenide, heating in an oil bath at 60-80 ℃ for reaction for 20-30 h, centrifuging after the reaction is finished, washing with absolute ethyl alcohol, and then vacuum drying for 20-30 h to obtain a product SiO 2 -NH-DSe; And fifthly, soaking 0.5-2 g of corrosion inhibitor (benzotriazole (BTA) or 8-hydroxyquinoline) into 1-3 g of SiO 2 -NH-DSe by using a vacuum soaking method, then drying in a 40-80 ℃ oven for 10-15 h to evaporate the solvent, and drying to obtain the BTA-loaded functional hollow SiO 2 microsphere. Compared with the prior art, the invention has the following advantages: Under severe environment, steel is easy to corrode to generate Fe 3+, and the double selenium bond (-Se-Se-) has stronger stimulus response performance to Fe 3+. The porous hollow SiO 2 has larger cavity and specific surface area, is odorless and nontoxic