Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings

doi:10.11902/1005.4537.2022.292

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 289-300 DOI: 10.11902/1005.4537.2022.292

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Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings

YUAN Shicheng¹^,², WU Yanfeng³, XU Changhui², WANG Xingqi², LENG Zhe¹(

), YANG Yange²(

)

^1.School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316022, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Equipment Project Management Center of Naval Equipment Department, Beijing 100071, China

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Abstract

The effect of polyhydroxy hyperdispersants on the anti-corrosion property of waterborne epoxy varnishes were studied by means of open circuit potential, electrochemical impedance spectroscopy, polarization curves measurements and adhesion test. The results show that the addition of polyhydroxy dispersant into the epoxy varnish may accelerate the water absorption rate of the coating, while the increased water absorption can result in the preferential failure of the epoxy varnish. The corrosion failure process of epoxy varnish and epoxy varnish with 2% dispersant in 3.5%NaCl solution is the same, which can be divided into four stages: rapid water absorption of coating, the formation of corrosion products at the coating/metal interface, the accumulation of corrosion products and the diffusion of corrosion products.

Key words: dispersant waterborne epoxy water absorption corrosion electrochemical impedance spectroscopy

Received: 21 September 2022 32134.14.1005.4537.2022.292

ZTFLH:

TQ630.4+9

Fund: Civil Aircraft Special Scientific Research Project(MJ-2017-J-99);Fundamental Research Funds for the Provincial Universities of Zhejiang(2021JZ006)

About author: LENG Zhe, E-mail: lengzhe@zjou.edu.cn
YANG Yange, E-mail: ygyang@imr.ac.cn;

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	Shicheng YUAN
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Cite this article:

YUAN Shicheng, WU Yanfeng, XU Changhui, WANG Xingqi, LENG Zhe, YANG Yange. Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 289-300.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.292 OR https://www.jcscp.org/EN/Y2023/V43/I2/289

Table 1 Fomula of the epoxy coatings (mass fraction / %)

Fig.1 OCP evolution of EV (a) and EVD (b) with immersion time

Fig.2 |Z|_0.01vs immersion time for EV (a) and EVD (b)

Fig.3 Nyquist (a-d), modules (e-h) and phase angle (i-l) for the four stages of EV failure process: stage I (0-96h), stage II (96-2160 h), stage III (2160-4800 h), stage IV (4800-6720 h)

Fig.4 Nyquist (a-d), modules (e-h) and phase angle (i-l) for the four stages of EVD failure process: stage I (0-384 h), stage II (384-1440 h), stage III (1440-4560 h), stage IV (4560-6720 h)

Fig.5 Equivalent circuit for simulation of the EIS data for both EV and EVD

Fig.6 Variation of the electrochemical parameters: (a) R_c, (b) Q_c, (c) R_ct, (d) Q_dl

Fig.7 Line fitting results for water diffusion in EV (a) and EVD (b) coating

Coating	Period / h	A	B / t· $s - 12$	R	D / 10^-10 cm²·s^-1
EV	0-96	-9.4935	1.67×10^-4	0.96504	1.06253
EVD	0-48	-9.6617	1.03×10^-3	0.99009	1.34064
EVD	48-384	-9.3163	1.81×10^-4	0.98373	0.28778

Table 2 Linear fitting parameters and calculation results of diffusion coefficient

Fig.8 Potentiodynamic polarization curves for EV (a) and EVD (b) coated electrode immersed in 3.5%NaCl solution after different time

Table 3 Electrochemical parameters of coatings immersed in 3.5%NaCl solution after different time

Fig.9 Variation of adhesion of two coatings with immersion time

Fig.10 Images of EV (a) and EVD (b) after adhesion test with 0 h (a1, b1), 6720 h (a2, b2) immersion time

Fig.11 Percentage of different fracture forms for two coatings

Fig.12 Microscopy morphologies of EV (a) and EVD (b) with 0 h (a1, b1), 4320 h (a2, b2), 6720 h (a3, b3) immersion time

Fig.13 Corrosion area percent of EV and EVD after different time immersion

Fig.14 Curing process of EVD: (a) initial state, (b) curing in progress, (c) final state

Fig.15 Failure process of EVD coating: (a) rapid water absorption, (b) corrosion product generation, (c) stable corrosion, (d) corrosion product diffusion

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