scholarly journals FORMULATION OF PASSIVATION FILM BREAKDOWN CONDITION OF STEEL BAR IN HIGH pH AQUEOUS SOLUTION BY POINT DEFECT DYNAMICS

2019 ◽  
Vol 75 (4) ◽  
pp. 239-250
Author(s):  
Nagate HASHIMOTO ◽  
Yoshitaka KATO
Keyword(s):  
Aqueous Solution ◽  
Point Defect ◽  
High Ph ◽  
Passivation Film ◽  
Film Breakdown ◽  
Steel Bar ◽  
Point Defect Dynamics

scholarly journals Chemical Composition of Corrosion Products of Rebar Caused by Carbonation and Chloride

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Jundi Geng ◽  
Junzhe Liu ◽  
Jiali Yan ◽  
Mingfang Ba ◽  
Zhimin He ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Corrosion Products ◽  
Chloride Salt ◽  
Oxide Content ◽  
Passivation Film ◽  
Steel Bar ◽  
Steel Bars ◽  
Main Components ◽  
Corrosion Of Steel ◽  
Peak Value

The microstructures of steel bars were studied by X-ray photoelectron spectroscopy (XPS), and the mechanism of corrosion of steel bars under the corrosion factors was elucidated. The results show that the passivation film and corrosive surface of the steel surface in the solution of the chloride-containing salt were coarser and the surface state was denser. The main corrosion products are FeOOH and FeO. The surface of the steel immersed in the simulated carbonized solution had loose pores. The main components are FeOOH, Fe3O4, and Fe2O3. The surface of the steel bar has a large amount of yellowish brown corrosion products in the simulated carbonization and chloride salt. The surface of the corrosion products was stripped and the main components are FeOOH, Fe3O4, and FeCl3, where the content of FeOOH is as high as 60%. The peak value of iron is gradually increased from the simulated chloride salt solution to the carbonized solution to the combined effect of carbonation and chloride salt; the iron oxide content is increased and corrosion of steel is obviously serious.

scholarly journals Reductive Adsorption of Chromium(VI) with Activated Carbon

2021 ◽  
Vol 333 ◽  
pp. 04004
Author(s):  
Anh Viet Hoang ◽  
Ya Wen Chen ◽  
Ya-Fen Wang ◽  
Syouhei Nishihama ◽  
Kazuharu Yoshizuka
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Process ◽  
Acidic Ph ◽  
High Adsorption ◽  
Varying Parameters ◽  
High Ph ◽  
Chromium Vi ◽  
Ph Range

Reductive adsorption of chromium (Cr) has been investigated, employing coal-based activated carbon with batchwise study. The adsorption was carried out by varying parameters such as pH of the aqueous solution and contact time. Cr(III) was hardly adsorbed on activated carbon, and it was precipitated at high pH region. High adsorption amounts of Cr(VI) was obtained at pH range 4.5 – 5.5. In the adsorption process, reduction of Cr(VI) to Cr(III) was occurred at especially acidic pH region, and thus most of Cr remained in the aqueous solution in this pH region was Cr(III).

Abrasion Modeling of Multiple-Point Defect Dynamics for Machine Condition Monitoring

2013 ◽  
Vol 62 (1) ◽  
pp. 171-182 ◽  
Author(s):  
M. F. Yaqub ◽  
Iqbal Gondal ◽  
Joarder Kamruzzaman ◽  
Kenneth A. Loparo
Keyword(s):  
Point Defect ◽  
Condition Monitoring ◽  
Multiple Point ◽  
Machine Condition ◽  
Machine Condition Monitoring ◽  
Point Defect Dynamics

Monitoring of chemical reactions and point defect dynamics in sodium alanates

2006 ◽  
Vol 442 (1-2) ◽  
pp. 75-78 ◽  
Author(s):  
O. Palumbo ◽  
A. Paolone ◽  
R. Cantelli ◽  
C.M. Jensen ◽  
R. Ayabe
Keyword(s):  
Point Defect ◽  
Chemical Reactions ◽  
Point Defect Dynamics ◽  
Sodium Alanates

Reactions of the methylmercury(II) ion with adenine and crystal structure of (adeninato-N9)methylmercury (II) monohydrate

1981 ◽  
Vol 59 (9) ◽  
pp. 1311-1317 ◽  
Author(s):  
Leonardo Prizant ◽  
Marc J. Olivier ◽  
Roland Rivest ◽  
André L. Beauchamp
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Infrared Spectra ◽  
Monoclinic Space Group ◽  
Space Group ◽  
High Ph

Adenine (HAd) reacts with CH3HgX (X = NO3, ClO4) in basic aqueous solution to form a compound [CH3HgAd]•H2O, which crystallizes in the monoclinic space group C2/c, with a = 19.796, b = 7.119, c = 16.471 Å, β = 128.83°, and Z = 8. The CH3Hg+ group is linearly bonded to N(9) of deprotonated adenine and the molecules are held in pairs by two [Formula: see text] hydrogen bonds. With excess adenine, higher complexes of the formula [(CH3Hg)nAd]Xn−1(where n = 2, 3) are formed, in which positions N(9) (deprotonated), N(7), and N(3) are successively filled. Compounds [(CH3Hg)3(Ad-H)]X have been obtained at high pH by substitution of H(9) and an amino hydrogen, and with coordination of a third CH3Hg+ group probably to N(7). Complexation leads to significant changes in the infrared spectra and the 1750–1250 cm−1 regions are correlated with the substitution patterns. The structures are discussed in connection with the basicity of the donors in adenine and the basicity changes of the remaining donors when other atoms are already involved in coordination.

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