Study on preparation and anticorrosive performance of a new high hydrophobic anticorrosive coating

Abstract

Water-based anticorrosive coatings have poor water resistance, which easily lead to coating deterioration and metal corrosion. In order to improve the anticorrosion performance of waterborne coating, herein, the polytetrafluoroethylene/dimethyl siloxane/epoxy resin (PTFE/PDMS/EP) hydrophobic anticorrosive coating was prepared by layer-by-layer construction. The spatial structure and microscopic morphology of the hydrophobic coating were analyzed by XRD, FTIR, and SEM. The hydrophobicity and corrosion resistance of the composite coating were analyzed by hydrophobicity test, electrochemical polarization curve, hydrophobicity and corrosion resistance test of the mixed layer, Tafel polarization curves, and AC impedance spectrum. The results showed that the water contact angle of PTFE/PDMS/EP coating reached 141 and the protection efficiency of PTFE/PDMS/EP coating was 98.62%. After soaking for 7 days, the corrosion process still stays at the initial stage, which was mainly due to the good sealing and barrier properties and high anticorrosion efficiency of PTFE/PDMS/EP coating. The coating has high corrosion protection efficiency and long service life, which is of great significance to metal corrosion protection in harsh marine environments.

Development and Application of Intelligent Coating Technology: A Review

“…The results indicated that the corrosion process was still in the initial stage, mainly due to the good barrier and sealing performance of EP/PTFE/PDMS coating, as well as its high anticorrosion efficiency. This coating had a long service life and high anticorrosion efficiency, which was of great significance for metal anticorrosion in harsh marine environments [65,66]. From the fluorescence photos, it can be seen that the RBA/LDHs in the coating effectively indicated the occurrence of corrosion under the coating and correctly located the corrosion site.…”

Ultrathin Al2O3 film modification on waterborne epoxy coatings by atomic layer deposition for augmenting the corrosion resistance

“…One method is to incorporate filler particles into waterborne epoxy coatings to reduce the defects and microcracks in the coatings and fill the internal micropores and polar channels, such as graphene [9,10], Fe 2 O 3 nanorods [11] and so on. The other method is to fabricate composite coatings with enhanced corrosion resistance, such as PTFE/PDMS/EP [12] and so forth. However, filler particles cannot completely eliminate the defects in the coatings, and the coatings still have long and winding polar channels.…”