“…Table 2 lists the fitting electrical parameters of AS/Ce-HT specimen. Compared with our previous data, this kind of coating own a higher R ct value at initial immersion stage under same test condition (most of them were in between 10 4 and 10 6 ), indicating a superior barrier effect against corrosion 27 , 47 , 65 , 78 . Figure 15 Nyquist plot of AS/Ce-HT specimen and the fitted result using equivalent circuits shown in Fig.…”
Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.
“…Table 2 lists the fitting electrical parameters of AS/Ce-HT specimen. Compared with our previous data, this kind of coating own a higher R ct value at initial immersion stage under same test condition (most of them were in between 10 4 and 10 6 ), indicating a superior barrier effect against corrosion 27 , 47 , 65 , 78 . Figure 15 Nyquist plot of AS/Ce-HT specimen and the fitted result using equivalent circuits shown in Fig.…”
Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.
“…When the P110 substrate is immersed in NaCl solution, as the surface is not protected by the coating, under the effect of osmotic pressure or polarization, Cl − in the corrosive medium will directly attack the surface of the substrate. The dissolution of Fe occurs at the anode, Equation ( 5), the oxygen absorption reaction at the cathode, Equation ( 6), the total reaction equation is Equation (7), and the oxide film is formed. The autocatalytic mechanism of Cl − accelerates the anodic dissolution rate of Fe Equations ( 8)- (10).…”
Metal matrix composites have become a research hotspot due to their unique properties. In this paper, Ni-W-Carbon fiber (CF) composite coating was prepared by electrodeposition method, and the effects of CF content on the microstructure, composition, and corrosion resistance of the coating were studied by means of Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectrometer (EDS) and electrochemical testing by changing the concentration of CF in the plating solution. The results show that when 0.4 g/L nano-CF is added, the CF content in the composite coating is the largest and the distribution is uniform; the surface roughness Ra of the composite coating reaches a minimum of 14 nm. The electrochemical results show that the composite coating electrodeposited in the electrolyte containing 0.4 g/L nano-CF has the highest corrosion resistance. The Guglielmi model can be used to describe the co-deposition behavior. This study provides useful enlightenment for the further application of Ni-W-CF coating in harsh corrosive environments.
“…The results demonstrated that the modification by PFDTMS could produce a better barrier to improve the corrosion resistance of AZ31 Mg alloy than the fatty acid with long carbon chains due to the formation of the Si–O-surface bond by a condensation polymerization reaction. Similarly, the in situ deposition of Mg–Al LDHs film on the anodized AZ31 Mg alloy followed by a modification by either MA or PFDTMS was examined by Zhang and co-workers [ 61 ]. LDHs with the biggest flakes were found to be the favorite adsorption sites for MA, while unfavorable for the adsorption of PFDTMS.…”
Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning
This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.
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