Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (8): 2539-2547.doi: 10.13229/j.cnki.jdxbgxb.20231395

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Corrosion resistance and inhibition mechanism of benzotriazole doped graphene/polyaniline/epoxy composite coatings

Hong-ling LI()   

  1. School of Chemistry & Materials Engineering，Xinxiang University，Xinxiang 453003，China
  • Received:2023-11-26 Online:2025-08-01 Published:2025-11-14

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Abstract:

To improve the corrosion resistance of GO/PANI/BTA/EP coating on the surface of 6061 aluminum alloy and explore its corrosion inhibition mechanism，graphene oxide （GO）/polyaniline （PANI） nanoparticles were prepared by in-situ copolymerization method. The corrosion inhibitor benzotriazole （BTA） was adsorbed on the surface of GO/PANI nanoparticles through physical adsorption， resulting in GO/PANI/BTA.The infrared spectrum shows that a layer of BTA has been successfully loaded onto the surface of GO/PANI. The adsorption rate of the loaded BTA on the surface of GO/PANI can reach 18.36%， and the release rate after 5 hours can reach over 90%， providing effective protection for aluminum alloys. The polarization curve and immersion experiment results show that the epoxy coating （GO/PANI/BTA/EP） with 1% GO/PANI/BTA added has excellent corrosion resistance. The self corrosion potential of 1% GO/PANI/BTA/EP is -0.267 V， which is 0.247 V higher than that of GO/PANI/EP； The self corrosion current density is 9.795×10-9A?cm-2， higher than GO/PANI/EP （self corrosion current density of 7.638×10-7A?cm-2） is two orders of magnitude lower. The 1% GO/PANI/BTA/EP composite coating has excellent corrosion resistance， and its corrosion inhibition mechanism comes from the organic combination of graphene oxide shielding， polyaniline passivation， and BTA corrosion inhibition， achieving a synergistic effect.

Key words: graphene oxide, polyaniline, benzotriazole, corrosion resistance, corrosion inhibition mechanism

CLC Number: 

  • TG174.4

Table1

Chemical composition of 6061Aluminium alloy"

SiFeCuMnMgCrZnTiAl
0.4~0.80.700.15~0.40.150.18~1.20.04~0.350.50.250.15余量

Fig.1

SEM images of GO/PANI/BTA at different magnifications"

Fig.2

FTIR spectrogram"

Fig.3

Polarization curves of GO/PANI/EP and different concentrations of GO/PANI/BTA/ EP immersed in 3.5% NaCl solution for 28 days"

Table2

Polarization curve fitting results of GO/PANI/EP and different concentrations of GO/PANI/BTA/EP"

涂层

自腐蚀

电位/V

自腐蚀电流密度

/（A?cm-2）

GO/PANI/EP-0.5147.638×10-7
1%GO/PANI/BTA/EP-0.2675.582×10-9
2%GO/PANI/BTA/EP-0.5296.743×10-8
4%GO/PANI/BTA/EP-0.4325.831×10-8

Fig.4

Surface morphology of different coatings before and after soaking in 3.5% NaCl solution for 28 days"

Fig.5

Corrosion microstructure of scratch surfaces of different coatings after soaking in 3.5% NaCl solution for 28 days， magnified 500 times"

Fig.6

BTA content absorbance curve and BTA release rate time curve"

Fig.7

Polarization curve"

Fig.8

Cross section SEM images of different coatings"

Fig.9

Molecular structure of ［BTA-Al -BTA］ n"

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