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Study on Extraction and Corrosion Inhibition of Betaine in Lycium Barbarum

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  • College of Chemical Engineering and Safety,Binzhou University,Binzhou 256603,China

Received date: 2022-09-08

  Revised date: 2022-10-10

  Accepted date: 2022-11-14

  Online published: 2023-03-15

Abstract

In order to develop an environment-friendly natural corrosion inhibitor,betaines in Lycium barbarum were extracted using cellulose.On the basis of single factor experiment,the extraction process was optimized by response surface methodology,and the inhibitory performance and mechanism of betaine crude extracting solution and its compound with polyaspartic acid for Q235 carbon steel in H2SO4 solution were studied.Results showed that the best conditions for the extraction of betaines from Lycium barbarum were an enzymolysis time of 59 min,an enzymolysis temperature of 46 ℃,an enzymolysis pH value of 3,a cellulose dosage of 3 mg/g,a liquid-solid ratio of 25 ∶1 (mL/g) and a methanol concentration of 80%(volume fraction).Under these conditions,the extraction rate of betaines was 20.34%,which was consistent with the predicted extraction rate 20.45%.The corrosion inhibition experiments exhibited that the betaine crude extracting solution of Lycium barbarum had good corrosion inhibition performance for carbon steel in sulfuric acid,and its inhibition efficiency increased with the rise of the concentration of betaine crude extracting solution.The inhibition efficiency reached more than 90%at 30 ℃when the concentration of betaine crude extracting solution reached 250 mg/L.After being combined with polyaspartic acid,the inhibition efficiency was enhanced obviously.Besides,both the betaine crude extracting solution and its complex were mixed-type inhibitors,which could be adsorbed on the surface of carbon steel to form a protective film.The adsorption process could be well described with Langmuir adsorption isolliemi equation.The adsorptions of betaine crude extractive and its complex on carbon steel surface were both spontaneous process dominated by physical adsorption in association with chemical adsorption.

Cite this article

ZHANG Sheng-yan . Study on Extraction and Corrosion Inhibition of Betaine in Lycium Barbarum[J]. Materials Protection, 2023 , 56(3) : 81 -90 . DOI: 10.16577/j.issn.1001-1560.2023.0063

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