Corrosion Protection Properties of Nano NH?-Reduced Graphene Oxide/Epoxy Composite Coatings Formed by Self-Curing on Magnesium Alloy.

Title Corrosion Protection Properties of Nano NH?-Reduced Graphene Oxide/Epoxy Composite Coatings Formed by Self-Curing on Magnesium Alloy.
Authors T. Jin; Y. Han; R. Bai; X. Liu
Journal J Nanosci Nanotechnol
DOI 10.1166/jnn.2018.15357
Abstract

Nano NH2-reduced graphene oxide (NGO) and NGO/epoxy resin coatings were prepared, respectively. NGO/epoxy coating was successfully coated on magnesium alloy substrates. X-ray diffraction patterns, Fourier transform infrared spectroscopy, Scanning electron microscopy techniques were used to characterize the composition and morphology of NGO and composite coatings. The effect of the content of NGO on the corrosion protection performance of coatings was evaluated with electrochemical measurements in 3.5 wt.% NaCl solutions. Tafel and electrochemical impedance spectroscopy analysis revealed that an optimal addition amount of 0.3 wt.% NGO provided the superior corrosion protection properties. The composite coatings exhibited outstanding barrier properties against aggressive species compared to pure epoxy coating. The self-curing reaction of amine and epoxy radicals could produce the compact cross-linking reticular structure. This self-curing reaction was a nucleophilic addition, and amine radical preferred to bond the (b) site of graphene sheets due to the lowest Gibbs free energy. The cross-linking structure and some polar groups could act as a good reservoir for corrosive medium via absorption and fixation.

Citation T. Jin; Y. Han; R. Bai; X. Liu.Corrosion Protection Properties of Nano NH?-Reduced Graphene Oxide/Epoxy Composite Coatings Formed by Self-Curing on Magnesium Alloy.. J Nanosci Nanotechnol. 2018;18(7):49714981. doi:10.1166/jnn.2018.15357

Related Elements

Magnesium

12 Mg 24.305000000 Magnesium

Magnesium Bohr ModelSee more Magnesium products. Magnesium (atomic symbol: Mg, atomic number: 12) is a Block S, Group 2, Period 3 element with an atomic mass of 24.3050. The number of electrons in each of Magnesium's shells is [2, 8, 2] and its electron configuration is [Ne] 3s2. The magnesium atom has a radius of 160 pm and a Van der Waals radius of 173 pm. Magnesium was discovered by Joseph Black in 1775 and first isolated by Sir Humphrey Davy in 1808. Magnesium is the eighth most abundant element in the earth's crust and the fourth most common element in the earth as a whole. Elemental MagnesiumIn its elemental form, magnesium has a shiny grey metallic appearance and is an extremely reactive. It is can be found in minerals such as brucite, carnallite, dolomite, magnesite, olivine and talc. Commercially, magnesium is primarily used in the creation of strong and lightweight aluminum-magnesium alloys, which have numerous advantages in industrial applications. The name "Magnesium" originates from a Greek district in Thessaly called Magnesia.

Carbon

6 C 12.010700000 Carbon

See more Carbon products. Carbon (atomic symbol: C, atomic number: 6) is a Block P, Group 14, Period 2 element. Carbon Bohr ModelThe number of electrons in each of Carbon's shells is 2, 4 and its electron configuration is [He]2s2 2p2. In its elemental form, carbon can take various physical forms (known as allotropes) based on the type of bonds between carbon atoms; the most well known allotropes are diamond, graphite, amorphous carbon, glassy carbon, and nanostructured forms such as carbon nanotubes, fullerenes, and nanofibers . Carbon is at the same time one of the softest (as graphite) and hardest (as diamond) materials found in nature. It is the 15th most abundant element in the Earth's crust, and the fourth most abundant element (by mass) in the universe after hydrogen, helium, and oxygen. Carbon was discovered by the Egyptians and Sumerians circa 3750 BC. It was first recognized as an element by Antoine Lavoisier in 1789.

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Alloys Nanomaterials Oxides
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