Abstract
A graphene modified epoxy surface tolerant coating was prepared, and the corrosion performance and rust conversion mechanism of the prepared composite coating on rusty carbon steel substrate was investigated. Scanning electron microscope (SEM), X-ray powder diffractometer (XRD), and infrared (IR) spectrum were used to confirmed the iron rust conversion performance by the reaction of phytic acid and rust. electrochemical impedance spectroscopy (EIS), polarization curve, and salt spray test were used to evaluate the corrosion resistance of low surface treatment coatings. Results indicated most of the rust were dissolved and transformed with the reaction of phytic acid and rust on the rusty carbon steel; graphene could effectively improve the compactness and protective performance of the epoxy surface tolerant coating.
Highlights
Heavy anticorrosive coating technology is the most economical and popular protection technology to slow down the corrosion rate of marine steel structures (Arukalam et al, 2018; Zhu et al, 2020)
To investigate the transformation mechanism of Phytic acid (PA) on rusty carbon steel, infrared (IR) and X-ray powder diffractometer (XRD) spectra of the rusty carbon steel, PA dropped on rusty carbon steel, and PA/G coating coated on rusty carbon steel are presented in Figures 1, 2, respectively
5 wt% PA solution was dropped on the rusty carbon steel for 4 h, the characteristic peaks of rusty carbon steel almost disappeared, and some new characteristic peaks located at 1,004 and 2,847 cm−1 appeared (Figure 1B), which corresponded to the P-O stretching vibration and the stretching vibration of OH in the P-OH group, indicating that PA could reacted with rust and has been absorbed on rusty carbon steel
Summary
Heavy anticorrosive coating technology is the most economical and popular protection technology to slow down the corrosion rate of marine steel structures (Arukalam et al, 2018; Zhu et al, 2020). The low surface treatment coatings contain active antirust pigments or rust conversion agents, which can transform active corrosion products, generate stable iron chelate, and become a part of the complete paint film as a way of inert fillers. We prepared a G modified epoxy surface tolerant coating using PA as a rust conversion agent and G as a functional filler. The corrosion performance of as-prepared surface tolerant coating on rusty steel was studied by means of electrochemical measurements in 3.5 wt % NaCl solution. To prepare the cross-section surfaces, firstly, the coating was cured at 80°C for 24 h, and FIGURE 3 | SEM images of rusty carbon steel (A) and rusty carbon steel reacted with 5 wt %PA solution for 24 h (B). Three coating/electrode systems were prepared for each electrode, and the electrochemical test was repeated three times
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