“…7 that the impedance spectra are not perfect semicircles and the depressed capacitive loop corresponds to surface heterogeneity which may be the result of surface roughness or dislocation. The inhibition efficiency is calculated using charge transfer resistance ( ) as follows 22 – 23 : where, and are the values of charge transfer resistance in presence and absence of Epoxy/ Alumina coating in 1 M HCl solution, respectively. Figure 7 Nyquist diagrams of melted zone in 1 M HCl without and with coating containing various concentrations of alumina.…”
Section: Corrosion Behaviour Of the Three Studied Zonesmentioning
The main purpose of this study is to elaborate anticorrosive coatings for the welded steel 316L, since this later is widely used in industrial field. Hence, within this work we have studied the electrochemical behaviour of different zones of the welded steel 316 in 1 M HCl media. The macrography study of the welded steel has revealed the different areas with a good contrast. We have stated three different zones, namely; melted zone (MZ), heat affected zone (HAZ) and base metal zone (BM). Impedance studies on welded steel 316L were conducted in 1 M HCl solution, coating of Epoxy/Alumina composite was applied on different zones, in order to reveal the anti-corrosion efficiency in each zone. Scanning electron microscopy (SEM) analysis was undertaken in order to check how far the used coating in such aggressive media protects the studied zones and these findings were assessed by water contact angle measurements. The choice of this coating is based on the cost and the safety. We concluded that the Epoxy/Alumina composite has a good protecting effect regarding welded steel in aggressive media.
“…7 that the impedance spectra are not perfect semicircles and the depressed capacitive loop corresponds to surface heterogeneity which may be the result of surface roughness or dislocation. The inhibition efficiency is calculated using charge transfer resistance ( ) as follows 22 – 23 : where, and are the values of charge transfer resistance in presence and absence of Epoxy/ Alumina coating in 1 M HCl solution, respectively. Figure 7 Nyquist diagrams of melted zone in 1 M HCl without and with coating containing various concentrations of alumina.…”
Section: Corrosion Behaviour Of the Three Studied Zonesmentioning
The main purpose of this study is to elaborate anticorrosive coatings for the welded steel 316L, since this later is widely used in industrial field. Hence, within this work we have studied the electrochemical behaviour of different zones of the welded steel 316 in 1 M HCl media. The macrography study of the welded steel has revealed the different areas with a good contrast. We have stated three different zones, namely; melted zone (MZ), heat affected zone (HAZ) and base metal zone (BM). Impedance studies on welded steel 316L were conducted in 1 M HCl solution, coating of Epoxy/Alumina composite was applied on different zones, in order to reveal the anti-corrosion efficiency in each zone. Scanning electron microscopy (SEM) analysis was undertaken in order to check how far the used coating in such aggressive media protects the studied zones and these findings were assessed by water contact angle measurements. The choice of this coating is based on the cost and the safety. We concluded that the Epoxy/Alumina composite has a good protecting effect regarding welded steel in aggressive media.
Epoxy resin, which is extensively used in civil and industrial applications, shows excellent comprehensive performance, especially as a polymer matrix used in fiber-reinforced composites. A thermal latent initiator, used as an epoxy curing agent, has high storage stability and is widely applied in the preparation of epoxy-based blends and fiber-reinforced composites. In this review, the basic properties of epoxy resins and commonly used curing agents are discussed while progress on the synthesis of thermal latent initiators is reviewed in detail. Moreover, the curing mechanisms, thermal stability, and mechanical properties of epoxy resins with thermal latent initiators are also discussed.
“…Moreover, micropores, microcracks, and cavities are inevitably produced by solvent evaporation during the curing process of epoxy, which leads to the more severe penetration of oxygen, water, and salts [ 10 , 11 ]. To overcome these shortcomings, various inorganic fillers, such as nanocarbons [ 12 , 13 ], oxides [ 14 , 15 , 16 , 17 ], and clays [ 18 , 19 ], have been studied to enhance corrosion resistance. Among these filler materials, graphene oxide (GO) has drawn a great deal of attention owing to its inherent large specific surface area, good water and oxygen resistance, ionic impermeability, and chemical stability [ 20 , 21 , 22 ].…”
Coatings are of great significance for irons and steels in regards to the harsh marine environment. Graphene oxides (GO) have been considered as an ideal filler material of epoxy coating. However, the undesired dispersion in the epoxy together with easy agglomeration and stacking remain great problems for practical application of GO composited epoxy coatings. A method that can effectively solve both self-aggregation and poor dispersion of GO is highly desired. Herein, we present a high dispersion strategy of graphene oxides in epoxy by co-decoration of nano-SiO2 and silane coupling agent. The co-decorated GO filled epoxy coating exhibits high anti-corrosion performance, including high electrochemical impedance, high self-corrosive potential, low self-corrosive current, and superior electrochemical impedance stability for ten days to Q235 carbon steel. This work displays new possibilities for designing novel coating materials with high performance toward practical marine anti-corrosion applications.
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