Study on practical performance of self⁃healing anticorrosion coating based on microencapsulated epoxy⁃amine chemistry

doi:10.19491/j.issn.1001-9278.2023.12.002

Abstract

Abstract:

Based on the microencapsulated epoxy⁃amine chemistry self⁃healing system， the relevant properties involved in the practical application of self⁃healing anticorrosion epoxy coatings were investigated， which included the service environment， thermal stability， and long⁃term anticorrosion performance after the damage event of the self⁃healing anticorrosion coatings， as well as the long⁃term stability of the self⁃healing function for the self⁃healing anticorrosion epoxy coatings. The results indicated that the self⁃healing system exhibited excellent anticorrosion performance when healed in the water environment. The medium⁃high temperature heat treatment did not reduce the anticorrosion performance of the self⁃healing coatings at 80 ℃ for 24 h and or at 5 min for 200 ℃. The 180⁃day long⁃term anticorrosion performance of the self⁃healing coatings after damage healing is excellent. Meanwhile， the self⁃healing anticorrosion coatings have a good long⁃term stability.

Key words: microcapsule, epoxy coating, self?healing, anticorrosion

CLC Number:

TQ325.1⁺4

WANG Yao, XIAO Yuan, CHENG Chuanrui, ZHAO Peng, ZHANG Chen, XIONG Daoying, JIANG Chuanxia, ZHANG He. Study on practical performance of self⁃healing anticorrosion coating based on microencapsulated epoxy⁃amine chemistry[J]. China Plastics, 2023, 37(12): 7-13.

Figures/Tables 11

样品编号	微胶囊含量^a/%	固化程序^b	涂层厚度/μm	修复环境	室温时效/天	裂纹宽度/μm	腐蚀时间^d/天
a	0	RT⁃24h_T35⁃24h	500	干燥箱^c	0	35，45	2
b	10.0	RT⁃24h_T35⁃24h	350	干燥箱	0	30，48	2
c	10.0	RT⁃24h_T35⁃24h	300	水中	0	30，43	2
d	10.0	RT⁃24h_T35⁃24h_T80⁃24h	200~300	干燥箱	0	19~92	2，180
e	10.0	RT⁃24h_T35⁃24h_T200⁃5min	250~600	干燥箱	0	30~77	2，180
f	0	RT⁃24h_T35⁃24h	200、300	干燥箱	0	32~53	2，180
g	5.0	RT⁃24h_T35⁃24h	200~600	干燥箱	0	17~45	2，180
h	10.0	RT⁃24h_T35⁃24h	120~400	干燥箱	0	19~54	2，180
i	15.0	RT⁃24h_T35⁃24h	300~500	干燥箱	0	26~58	2，180
j	10.0	RT⁃24h_T35⁃24h	150~320	干燥箱	180^e	23~60	2，180

Tab.1. Sample information and performance test information adopted in this study

Fig.1. Corrosion behavior of different cracked samples after being accelerated corrosion in 10.0 wt% saline solution for 2 days

Fig.2. Self⁃healing anticorrosion performance of the self⁃healing anticorrosion coatings containing 10.0 wt% microcapsules after treatment at 80 ℃ for 24 h

Fig.3. Anticorrosion performance of the self⁃healing anticorrosion coatings containing 10.0 wt% microcapsules after treatment at 200 °C for 5 mins

Fig.4. Long⁃term （6 months） anticorrosion performance of pure epoxy coating with prefabricated cracks

Fig.5. Long⁃term （6 months） anticorrosion performance of self⁃healing anticorrosion coatings containing 5.0 wt% microcapsules

Fig.6. Long⁃term （6 months） anticorrosion performance of self⁃healing anticorrosion coatings containing 10.0 wt% microcapsules

Fig.7. Long⁃term （6 months） anticorrosion performance of self⁃healing anticorrosion coatings containing 15.0 wt% microcapsules

Fig.8. Long⁃term anticorrosion performance of the self⁃healing anticorrosion coatings containing 10.0 wt% microcapsules after treatment at 80 ℃ for 24 h

Fig.9. Long⁃term anticorrosion performance of the self⁃healing anticorrosion coatings containing 10.0 wt% microcapsules after treatment at 200 °C for 5 mins

Fig.10. Short⁃term （2 days） and long⁃term （6 months） anticorrosion performance of a self⁃healing coating containing 10.0 wt% 100 μm microcapsules after being left at room temperature for 6 months

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