Environment-friendly acid washing corrosion inhibitor and application thereof
A pickling corrosion inhibitor, an environment-friendly technology, applied in the field of metal anti-corrosion, can solve environmental hazards, human, animal, and ecological environment hazards, etc., and achieve the effect of corrosion inhibition, simple use method, and high slow-release rate
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[0041] In some preferred embodiments, the preparation method of the polyaromatic nitrogen-containing carbon quantum dots includes:
[0042] The reaction monomer is uniformly mixed with the solvent, and then heated for solvothermal reaction, dehydration, decarboxylation and bonding between molecules occur, and finally polyaromatic nitrogen-containing carbon quantum dots are obtained.
[0043] Wherein, the reactive monomer includes a compound containing a benzene ring and an amino group.
[0044] In some preferred embodiments, the reactive monomers include aminobenzoic acid compounds and / or phenylenediamine compounds.
[0045] Further, the reaction monomer is selected from any one of 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine and m-phenylenediamine, or a combination of two or more , but not limited to this.
[0046] In some embodiments, the temperature of the solvothermal reaction is 180-200° C., and the time is 12-18 hours.
[0047] ...
Embodiment 1
[0079] 1. Dissolve 0.6g of 4-aminosalicylic acid in 60mL of absolute ethanol, then heat at 200°C for 18h. After the reaction is completed, the reaction solution is placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials. The purified product was centrifuged to remove the solvent, and dried in vacuum to obtain polyaromatic ring nitrogen-containing carbon quantum dots. The TEM and SPM topography diagrams can refer to Figure 1a and Figure 1b , it can be observed that the size of the polyaromatic nitrogen-containing carbon quantum dot is about 3-4nm (such as Figure 1c , Figure 1d , Figure 1e ), and is mainly composed of C, N, O three elements (such as Figure 1f ). The obtained polyaromatic nitrogen-containing carbon quantum dots were prepared to form an environment-friendly pickling corrosion inhibitor.
[0080] 2. Immerse the Q235 carbon steel sheet in 1mol·L -1 hydrochloric acid solution, and add the environment-friendly pickling corrosion...
Embodiment 2
[0086] 1. Dissolve 0.6g of p-phenylenediamine in 60mL of absolute ethanol, then heat at 180°C for 12h. After the reaction is completed, the reaction solution is placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials. The purified product is centrifuged to remove the solvent, and vacuum-dried to obtain polyaromatic nitrogen-containing carbon quantum dots. The obtained polyaromatic nitrogen-containing carbon quantum dots were prepared to form an environment-friendly pickling corrosion inhibitor.
[0087] 2. Immerse the Q235 carbon steel sheet in 1mol·L -1 hydrochloric acid solution, and add the environment-friendly pickling corrosion inhibitor prepared in this embodiment, so that the concentration of the corrosion inhibitor is 0mg L -1 , 10mg·L -1 , 50mg·L -1 , 100mg·L -1 , 200mg·L -1 , soaked at room temperature for 0.5 hours for polarization test.
[0088] Polarization test results such as Figure 5 As shown, the sustained release efficienc...
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