local electrochemical impedance spectroscopy
Recently Published Documents


TOTAL DOCUMENTS

33
(FIVE YEARS 6)

H-INDEX

11
(FIVE YEARS 1)

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 439
Author(s):  
Li Wan ◽  
Yinghua Wei ◽  
Hongtao Zhao ◽  
Haijiao Cao ◽  
Jing Li

Corrosion behavior of epoxy-coated rebar with different size of microdefects in uncarbonated/carbonated simulated pore solution (U/CSPS) of seawater concrete was investigated. Specimens in both solutions underwent two stages of corrosion, according to the electrochemical impedance spectroscopy (EIS) response. The initial stage was the extension of corrosion. The second stage was dominated by the diffusion process, due to the corrosion products blocking the defects and hindering the transportation of the reaction matter. Local electrochemical impedance spectroscopy (LEIS), scanning vibrating electrode technique (SVET) measurements and the observation of corrosion products indicated that 50 μm might be the threshold, because the corrosion of specimens with defects bigger than 50 μm in diameter was significantly more severe. Crevice corrosion was identified to occur in the experiments. The corrosion products of specimens in USPS and CSPS were mainly Fe3O4 and FeOOH, respectively. α-FeOOH and β-FeOOH exhibited an anion ion-selective property in the corrosion process, which induced crevice corrosion in CSPS. In particular, it is contended herein that Fe3O4 has the cation ion-selective property to protect the substrate in USPS.


2020 ◽  
Vol MA2020-02 (20) ◽  
pp. 1570-1570
Author(s):  
Maurilio Pereira Gomes ◽  
Isolda Costa ◽  
Nadine Pebere ◽  
Jesualdo Luis Rossi ◽  
Mireille Turmine ◽  
...  

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 790
Author(s):  
Junbo Liu ◽  
Shuming Wen ◽  
Qicheng Feng ◽  
Qian Zhang ◽  
Yijie Wang ◽  
...  

Sulfide hemimorphite can be depressed by Fe3+ during flotation. In this study, the depression mechanism was studied by microflotation, inductively-coupled plasma mass spectrometry, local electrochemical impedance spectroscopy (LEIS), and X-ray photoelectron spectroscopy (XPS). Flotation test results suggested that sulfated hemimorphite can be depressed by Fe3+ across the entire pH range. LEIS, adsorption analysis, and XPS indicated that S species were adsorbed on hemimorphite as ZnS. The sulfide film was attenuated and no adsorbed Fe species were found after treatment with Fe3+. The results indicate that Fe3+ reacts with the ZnS film, which decreases the number S species, and this leads to hemimorphite depression.


Sign in / Sign up

Export Citation Format

Share Document