Corrosion resistance of graphene/waterborne epoxy composite coatings in CO ₂ -satarated NaCl solution

Abstract

This study investigated the corrosion resistance of graphene/waterborne epoxy composite coatings in CO 2 -satarated NaCl solution. The coatings were prepared by dispersing graphene in waterborne epoxy with the addition of carboxymethylcellulose sodium. The structure and composition of the coatings were characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared and Raman spectroscopies. The corrosion resistance of the composite coatings was investigated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy. Composite coatings with more uniform surfaces and far fewer defects than blank waterborne epoxy coatings were obtained on 1020 steel. The 0.5 wt% graphene/waterborne epoxy composite coating exhibited a much lower corrosion rate and provided better water resistance properties and long-term protection than those of the blank epoxy coating in CO 2 -satarated NaCl solution.

Designing Modified Graphene Oxide-epoxy Coatings for Enhancing the Corrosion Resistant Performance of Mild Steel in Sodium Chloride Solution

“…It cannot be eliminated completely. But it can be reduced by the addition of inhibitors [4][5][6][7] (organic and inorganic) to the corrosive media, alloying [8][9] , and surface coatings [10][11][12] . Surface coatings may be polymer coatings, metallic coatings , or non-metallic coatings.…”

Polyvinyl butyral/3‐Hydroxy‐2‐naphthoic hydrazide/Poly (methylhydrosiloxane) Composite Coatings for Improved Stainless Steel Anticorrosion in Salt, Acid, and Alkali Solution

“…[17][18][19][20][21][22] Xu et al tested the corrosion resistance of graphene/ carboxymethylcellulose sodium/waterborne epoxy composite coating in CO 2 -saturated NaCl solution. [7] However, corrosive particles entered into coating easily and resulted in premature failure, due to the embrittlement of cured epoxy resin. By comparison, PVB has good flexibility, low glass transition temperature, high tensile strength and impact strength because of its long-branched chain.…”

“…[1][2][3][4][5] Therefore, it is imperative for metal substrate to utilize technology, which can reduce the impact of corrosion and prolong the service life of metals in all kinds of environment. Most research on metal anti-corrosion has been carried out in three directions: coating, [3,6,7] metal surface modification and electrochemical protection. [1,8,[9][10][11] Surface modification and electrochemical protection existed the shortage of polluting the environment and wasting energy among all the means.…”

Organic silicone-modified waterborne epoxy coatings using aqueous curing agents technology

“…In the industrial market, waterborne epoxy coatings have gradually replaced the traditional solvent-based epoxy coatings. However, their performance is far inferior to that of solvent-based coatings (Ai et al , 2019; Xu et al , 2020), such as brittleness, poor heat and corrosion resistance (Zuo et al , 2018). It is remarkable that the waterborne epoxy curing agent plays an essential role in the properties of the cured epoxy system (Baig and Samad, 2021; Huang et al , 2021; Ren et al , 2010).…”