Investigation of the anticorrosion layer of reinforced steel based on graphene oxide in simulated concrete pore solution with 3 wt.% NaCl

The aggregation mechanism of an MK–GO hybrid in the pH range of 10–11 due to the surface complexation between Al(OH)4− formed by MK dissolution and the graphene layer of GO through Lewis acid–base interaction.

Download Full-text

Effect of reduced graphene oxide nanoparticles as anticorrosion material on mild steel substrate

Journal of Physics Conference Series ◽

10.1088/1742-6596/2070/1/012192 ◽

2021 ◽

Vol 2070 (1) ◽

pp. 012192

Author(s):

S Sreelekshmi ◽

M Ananth Kumar

Keyword(s):

Graphene Oxide ◽

Mild Steel ◽

Reduced Graphene Oxide ◽

Pore Solution ◽

Steel Substrate ◽

Composite Coatings ◽

Barrier Properties ◽

Open Circuit ◽

Epoxy Coating ◽

Reduced Graphene

Abstract Reduced graphene oxide(rGO) has a lot of potential in the area of corrosion control of metals, because of its excellent barrier properties, dispersion capabilities, and impermeability. The current work hires on the corrosion resistance action of reduced graphene oxide(rGO) as an inhibitor for mild steel in simulated concrete pore solution. Here, three different nano rGO contained epoxy coatings were prepared by varying the percentage of rGO. The anticorrosion behaviour of rGO integrated epoxy composite coating was evaluated using open circuit potential and polarization studies. The results indicated that rGO nanoparticles were properly distributed in the epoxy coating and showed excellent barrier properties. Moreover, anti-corrosion processes for composite coatings improved by the addition of various percentages of rGO were apparently hypothesized, implying that epoxy coating containing 1.0 wt.% rGO showed better corrosion resistant behaviour in concrete pore solution medium containing 0.5M NaCl solution.

Download Full-text

Electrochemical Characterization and Inhibiting Mechanism on Calcium Leaching of Graphene Oxide Reinforced Cement Composites

Nanomaterials ◽

10.3390/nano9020288 ◽

2019 ◽

Vol 9 (2) ◽

pp. 288 ◽

Cited By ~ 3

Author(s):

Wu-Jian Long ◽

Tao-Hua Ye ◽

Li-Xiao Li ◽

Gan-Lin Feng

Keyword(s):

Graphene Oxide ◽

Loss Rate ◽

Electrochemical Impedance ◽

Pore Solution ◽

Strength Loss ◽

Hardened Cement ◽

Cement Composites ◽

Calcium Leaching ◽

Reinforced Cement ◽

Scanning Electron

Calcium leaching is a degradation progress inside hardened cement composites, where Ca2+ ions in cement pore solution can migrate into the aggressive solution. In this work, calcium leaching of graphene oxide (GO) reinforced cement composites was effectively characterized by combined techniques of electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). Inhibiting mechanism of GO on calcium leaching of the composites was also examined. The obtained results show that the diameter of the semi-circle of the Nyquist curves of leached samples with GO addition decreased less than that of controlled samples. After leaching for 35 days, loss rate of model impedance RCCP of leached samples with 0, 0.05, 0.1, 0.15, and 0.2 wt.% GO addition was 94.85%, 84.07%, 79.66%, 75.34%, and 68.75%, respectively. Therefore, GO addition can significantly mitigate calcium leaching of cement composites, since it can absorb Ca2+ ions in cement pore solution, as well as improve the microstructure of the composites. In addition, coupling leaching depth and compressive strength loss were accurately predicted by using the impedance RCCP.

Download Full-text