Micro- and Nano-Scopic Aspects of Passive Surface on Pearlite Structure of Carbon Steel in pH 8.4 Boric Acid-Borate Buffer

2019 ◽  
Vol 166 (11) ◽  
pp. C3409-C3416
Author(s):  
Koji Fushimi ◽  
Ryogo Nakagawa ◽  
Yuichi Kitagawa ◽  
Yasuchika Hasegawa
Keyword(s):  
Carbon Steel ◽  
Boric Acid ◽  
Borate Buffer

Passivity of Dual-Phase Carbon Steel with Ferrite and Martensite Phases in pH 8.4 Boric Acid-Borate Buffer Solution

2015 ◽  
Vol 162 (7) ◽  
pp. C322-C326 ◽  
Author(s):  
Kei Yanagisawa ◽  
Takayuki Nakanishi ◽  
Yasuchika Hasegawa ◽  
Koji Fushimi
Keyword(s):  
Carbon Steel ◽  
Boric Acid ◽  
Borate Buffer ◽  
Dual Phase ◽  
Borate Buffer Solution ◽  
Buffer Solution

(Invited) Micro- and Nano-Structure of Passive Film Formed on High Strengthen Steel Surface in pH 6.5 Boric Acid-Borate Buffer Solution

2020 ◽  
Vol MA2020-02 (12) ◽  
pp. 1263-1263
Author(s):  
Koji Fushimi ◽  
Kanta Higa ◽  
Yuichi Kitagawa ◽  
Yasuchika Hasegawa ◽  
Hideki Katayama
Keyword(s):  
Boric Acid ◽  
Passive Film ◽  
Steel Surface ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Nano Structure

Simultaneous pollutant removal and electricity generation in denitrifying microbial fuel cell with boric acid-borate buffer solution

2015 ◽  
Vol 71 (5) ◽  
pp. 783-788 ◽  
Author(s):  
Gang Chen ◽  
Shaohui Zhang ◽  
Meng Li ◽  
Yan Wei
Keyword(s):  
Fuel Cell ◽  
Boric Acid ◽  
Nitrogen Removal ◽  
Electricity Generation ◽  
Solution Concentration ◽  
Pollutant Removal ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
External Resistance ◽  
Buffer Solution

A double-chamber denitrifying microbial fuel cell (MFC), using boric acid-borate buffer solution as an alternative to phosphate buffer solution, was set up to investigate the influence of buffer solution concentration, temperature and external resistance on electricity generation and pollutant removal efficiency. The result revealed that the denitrifying MFC with boric acid-borate buffer solution was successfully started up in 51 days, with a stable cell voltage of 205.1 ± 1.96 mV at an external resistance of 50 Ω. Higher concentration of buffer solution favored nitrogen removal and electricity generation. The maximum power density of 8.27 W/m3 net cathodic chamber was obtained at a buffer solution concentration of 100 mmol/L. An increase in temperature benefitted electricity generation and nitrogen removal. A suitable temperature for this denitrifying MFC was suggested to be 25 °C. Decreasing the external resistance favored nitrogen removal and organic matter consumption by exoelectrogens.

Stability of the Mg65Y10Cu15Ag10 metallic glass in neutral and weakly acidic media

2003 ◽  
Vol 18 (1) ◽  
pp. 97-105 ◽  
Author(s):  
R. V. Subba Rao ◽  
U. Wolff ◽  
S. Baunack ◽  
J. Eckert ◽  
A. Gebert
Keyword(s):  
Metallic Glass ◽  
Boric Acid ◽  
Ph Value ◽  
Saturated Calomel Electrode ◽  
Corrosion Current ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Acidic Media ◽  
Buffer Solution ◽  
Chemical States

The corrosion behavior of the bulk glass-forming Mg65Y10Cu15Ag10 alloy was studied in neutral and weakly acidic media. Potentiodynamic polarization studies in cyclic and linear modes were carried out in electrolytes with a pH = 7, containing different anions. The alloy corroded freely in electrolytes with sulfate and pthalate ions, whereas passivity was observed in the electrolyte with borate ions. Further tests were performed in boric-acid-added borate buffer solution with pH = 7, 6, and 5. From Tafel characteristics, corrosion potentials and corrosion current densities were estimated. The data were compared with those of the ternary Mg65Y10Cu15 metallic glass. Potentiostatic anodic polarization tests were conducted on the Mg65Y10Cu15Ag10 alloy in boric-acid-added borate buffer solution with pH = 7 at two different potentials, 800 and 300 mV, saturated calomel electrode, which revealed different current transient characteristics. Auger electron spectroscopy was employed to characterize the anodically generated passive layers. The depth distributions of the elements as well as their chemical states were detected to be different for layers formed in electrolytes (i) with different pH values (8.4 and 7) of the same anion, (ii) with the same pH value but containing different anions (borate, sulfate, and pthalate), and (iii) with the same pH value and anion (borate) but at two different anodic potentials.

Experimental Investigation on Denting in PWR Steam Generators: Causes and Corrective Actions

1983 ◽  
Vol 105 (4) ◽  
pp. 755-762 ◽  
Author(s):  
F. Nordmann ◽  
G. Pinard-Legry ◽  
J. Daret ◽  
J. P. Brunet
Keyword(s):  
Carbon Steel ◽  
Boric Acid ◽  
Calcium Hydroxide ◽  
River Water ◽  
Ph Value ◽  
Steam Generators ◽  
Oxide Morphology ◽  
Specific Effects ◽  
On Line ◽  
Oxygen Addition

Denting studies have been undertaken in order to assess the influence of the most important parameters which could initiate corrosion of the carbon steel occurring in the tube-tube support plate crevices of some PWR steam generators. Tests have been carried out in model boilers where feedwater was polluted with sea or river water. Specific effects of chloride or sulfate and influence of oxygen content, magnetite addition and pH value were investigated. In magnetite prepacked crevices, denting is obtained within 1000 hrs for seawater pollution of 0.3 ppm chloride at the blowdown. In neutral chloride or in river water, denting is observed only with oxygen addition. Denting prevention is effective in the case of an on-line addition of phosphate, boric acid, or calcium hydroxide. For denting stopping, boric acid or calcium hydroxide is efficient even with a high seawater pollution. Soaks cannot stop denting if they are not followed by an on-line treatment (boric acid, calcium hydroxide). With quadrifoil holes, denting doesn’t occur. In very severe test conditions, 13 percent Cr steel can be corroded, but the corrosion rate is low and oxide morphology is different from that growing on carbon steel.

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