PREPARATION METHOD OF LOW-PH CONTROLLED-RELEASE INTELLIGENT CORROSION INHIBITOR
First Claim
1. A preparation method of a low-pH controlled-release corrosion inhibitor, comprising the steps of:
- (a) dissolving a monomer in an aqueous solution of an acidic medium with a mass fraction of 0.5-1.0% to prepare a monomer-acidic medium aqueous solution wherein said monomer has a mass fraction of 1.2%-1.8%, then adding an aqueous solution of a crosslinking agent with a mass fraction of 1%-2% to said monomer-acidic medium aqueous solution, and stirring and reacting, wherein said monomer is chitosan, said acidic medium is acetic acid, and said crosslinking agent is glutaraldehyde;
(b) cooling, washing, freezing, and drying the product prepared in step (a) to obtain a pH-responsive hydrogel; and
(c) adding said pH-responsive hydrogel into an aqueous solution of a corrosion inhibiting substance having a concentration of 1-5 mg/mL, and then lyophilizing in vacuum to prepare said low-pH controlled-release corrosion inhibitor, wherein said corrosion inhibiting substance is benzotriazole.
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Abstract
This disclosure relates to a preparation method of a low-pH controlled-release intelligent corrosion inhibitor. The low-pH controlled-release intelligent corrosion inhibitor comprises a hydrogel with low pH responsiveness and a corrosion inhibiting substance having the capacity of corrosion inhibition. That is, a corrosion inhibiting substance is wrapped in a low-pH sensitive hydrogel. The swelling degree of the pH sensitive hydrogel may be changed according to the amounts of monomers and crosslinking agents so as to control the releasing speed of the corrosion inhibiting substance. By the soaking experiment and the measurements of electrochemical polarization curves and alternating impedance spectra, the sensitive and long-lasting features of the low-pH controlled-release intelligent corrosion inhibitor are indicated. Therefore, the advantageous effects of this disclosure lies in that: 1) the system enables the releasing speed of the corrosion inhibiting substance to be controlled by pH; 2) the system enables long-lasting effect and high corrosion inhibition efficiency of the corrosion inhibiting substance; and 3) the system has broad applicability.
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Citations
5 Claims
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1. A preparation method of a low-pH controlled-release corrosion inhibitor, comprising the steps of:
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(a) dissolving a monomer in an aqueous solution of an acidic medium with a mass fraction of 0.5-1.0% to prepare a monomer-acidic medium aqueous solution wherein said monomer has a mass fraction of 1.2%-1.8%, then adding an aqueous solution of a crosslinking agent with a mass fraction of 1%-2% to said monomer-acidic medium aqueous solution, and stirring and reacting, wherein said monomer is chitosan, said acidic medium is acetic acid, and said crosslinking agent is glutaraldehyde; (b) cooling, washing, freezing, and drying the product prepared in step (a) to obtain a pH-responsive hydrogel; and (c) adding said pH-responsive hydrogel into an aqueous solution of a corrosion inhibiting substance having a concentration of 1-5 mg/mL, and then lyophilizing in vacuum to prepare said low-pH controlled-release corrosion inhibitor, wherein said corrosion inhibiting substance is benzotriazole. - View Dependent Claims (2, 3, 4, 5)
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Specification