Investigating Tribological Properties of Electrophoretically Deposited Graphene Nanoplatelets Coatings on Mild Steel

Mild steel is widely used for various construction industries and pipelines due to its low cost compared to other forms of steel. However, its poor anticorrosion behavior and limited mechanical properties are two main disadvantages in its potential applications. Graphene is one of the gifted carbon nanomaterials developed in this century. It is a wonderful two-dimensional carbon nanomaterial structured with a single layer of atoms and has attracted great interest in recent years due to its unique, mechanical, anticorrosion, electrical, optical, and catalytic properties. The literature claimed that graphene derivatives and their nanocomposites have efficient potential for protecting mild steel from corrosive environments and can enhance surface mechanical properties, especially hardness. An attempt has been made to study the overall properties, synthesis, and characterization of graphene derivatives. Anticorrosion behavior and hardness properties of graphene derivative-based coating on mild steel substrate have been presented in this review. 

Graphene‐Based Coating on Mild Steel for Improving Anticorrosion and Microhardness Behavior

Phosphating is a widely used metal pre-treatment process due to its ability to improvise pitting corrosion resistance, wear-resistance, and adherence properties. In the present investigation, we report the manufacturing of spray grade powder of Fe-P metal ingot by mechanical hammering, milling and sieving process. The Fe-P powder and its blending with reduced graphene oxide (rGO) (2 and 4 vol%) were successfully coated over mild steel by the thermal plasma spray method for the first time. Successful retention of rGO was observed even after thermal plasma spraying of Fe-P/rGO (2 vol% and 4 vol%), which was challenging and yet to be reported. The morphological investigation of the top-coat layer and cross-section was analysed using a field emission scanning electron microscope (FESEM). The presence of G, D and 2D bands at 1580 cm−1, 1350 cm−1, and 2700 cm−1, respectively in the Raman spectra were the straightforward demonstration of the retention of rGO. Hardness and air-jet erosion tests were performed to evaluate mechanical properties in view of exploring commercial applications of such coatings. We found that Fe-P-rGO composite coatings exhibited improved hardness, erosion, and corrosion resistance properties with increasing reduced graphene oxide content.

Plasma processing of Fe-P/rGO powder for making robust wear resistance and anticorrosion coating over mild steel

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Plasma processing of Fe-P/rGO powder for making robust wear resistance and anticorrosion coating over mild steel