“…In general, surfaces with high polar surface energy components tend to react with liquids with a high surface tension of polar components. 62 It could be seen in Table S3† that the polar force of the epoxy resin system decreased after the addition of a 60CN/WO filler, indicating a very small reaction tendency of the coating surface with polar liquids (water). The decline process experienced by the surface energy was due to the prominent advantage of the corrosion product layer generated by the closed connection induced between the two-dimensional layered fillers.…”
The use of heterojunctions for metal corrosion protection is a highly innovative and challenging work. Based on the composition and structure of tungsten oxide-based heterojunction, Z-scheme heterojunctions were designed and...
“…In general, surfaces with high polar surface energy components tend to react with liquids with a high surface tension of polar components. 62 It could be seen in Table S3† that the polar force of the epoxy resin system decreased after the addition of a 60CN/WO filler, indicating a very small reaction tendency of the coating surface with polar liquids (water). The decline process experienced by the surface energy was due to the prominent advantage of the corrosion product layer generated by the closed connection induced between the two-dimensional layered fillers.…”
The use of heterojunctions for metal corrosion protection is a highly innovative and challenging work. Based on the composition and structure of tungsten oxide-based heterojunction, Z-scheme heterojunctions were designed and...
“…Asl et al [131] sealed the MAO coating on AZ31 using rGO and prepared the MAO-LDH/rGO composite coating. Figure 13(A, a) shows that the corrosion current density () of MAO-LDH/rGO was lower than that of MAO-LDH which was lower than that of MAO, which indicated that the porosity of MAO was reduced and the anti-corrosion performance of the coating was enhanced.…”
Section: Function Of Graphene In Anti-corrosion Coatingsmentioning
confidence: 99%
“…The anti-corrosion property was improved by the synergistic effect of LDH and rGO. Figure 13 (A) Polarization curves of the MAO, MAO-LDH and MAO-LDH/rGO in 3.5-wt-% NaCl solution after (a) 30 min and (b) 7 days immersion [131]. (B) EIS lines of the (a–c) MAO, (d–f) MAO-LDH and (g–i) MAO-LDH/rGO coatings after 30 min, 3 and 7 days immersion in 3.5-wt-% NaCl solution [131].…”
Section: Function Of Graphene In Anti-corrosion Coatingsmentioning
Magnesium alloys are low in density, high in strength and non-toxic, nevertheless, their industrial application is substantially limited owing to their low electrode potential and susceptibility to corrosion. Surface and coating technology is widely used to improve their corrosion resistance. Graphene is one candidate material for anti-corrosion coatings because of its high aspect ratio, outstanding chemical resistance and good physical resistance. Its good barrier properties mean that graphene may have a wide range of applications in magnesium alloy coatings. This paper reviews (i) the potential of graphene for anti-corrosion coatings, (ii) the production methods and types of graphene anti-corrosion coatings, (iii) their properties, (iv) the protection mechanisms and (v) the future development trends of graphene-based corrosion protective coatings on magnesium alloys.
“…Magnesium alloys have been studied and widely used in aerospace, automotive, military and other industries due to their high specific strength, excellent casting, cutting properties and good dimensional stability [1–3] . However, the poor corrosion resistance of magnesium alloys limits their application in special environmental fields.…”
Section: Introductionmentioning
confidence: 99%
“…Magnesium alloys have been studied and widely used in aerospace, automotive, military and other industries due to their high specific strength, excellent casting, cutting properties and good dimensional stability. [1][2][3] However, the poor corrosion resistance of magnesium alloys limits their application in special environmental fields. Furthermore, considering the need of the surface color of magnesium alloys in some specific fields, such as communication technologies, electronics, optical instruments, and military fields, it is imperative to improve their decorative properties.…”
In this paper, a new environmentally friendly micro‐arc oxidation (MAO) colorant coating was proposed, which greatly improved the corrosion resistance of magnesium alloy. Herein, the black MAO coatings with uniform color and superior performance were successfully prepared on AZ91D alloy to expand the application of magnesium alloy. It was found that the color of the MAO coatings changes from white (80.76) to black (19.92) with the increased concentration of cupric pyrophosphate, attributed to the formation of copper compounds (CuO) in the outer layer of MAO coatings. In addition, electrochemical corrosion tests were also carried out in 3.5 wt% NaCl solution. And it was found that the corrosion potential and current were −1.32 V and 1.06×10−6 A/cm2, respectively, which increased by 0.15 V and decreased by 3.16×10−6 A/cm2 compared to those without cupric pyrophosphate. In conclusion, black MAO coatings produced at a cupric pyrophosphate concentration of 6 g/L, an oxidation time of 17 min, and a termination voltage of 375 V had an excellent performance and superior corrosion resistance. Therefore, it was provided a new idea for the research of surface in‐situ treatment technology with the composite of zirconia salt electrolyte and cupric pyrophosphate.
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