Corrosion resistance of titanium and zirconium alloys in formic acid solutions

1990 ◽  
Vol 26 (7) ◽  
pp. 374-375
Author(s):  
V. -I. D. Zaritskii
Keyword(s):  
Corrosion Resistance ◽  
Formic Acid ◽  
Zirconium Alloys ◽  
Acid Solutions

Investigation of the corrosion resistance of vitreous-enamel coatings in formic-acid-manufacturing media

1987 ◽  
Vol 23 (12) ◽  
pp. 623-624
Author(s):  
P. S. Shkolyar ◽  
A. P. Manzhelii ◽  
O. V. Bobovich ◽  
T. P. Borodai
Keyword(s):  
Corrosion Resistance ◽  
Formic Acid ◽  
Vitreous Enamel

Paper chromatography of glucose-formic acid solutions

1968 ◽  
Vol 37 ◽  
pp. 545-546 ◽  
Author(s):  
Brother Thomas McCullough ◽  
Edward DeJong ◽  
Brother Chester Caster
Keyword(s):  
Formic Acid ◽  
Paper Chromatography ◽  
Acid Solutions

Effect of Bi Addition on the Corrosion Behavior of Zirconium Alloys

2013 ◽  
Author(s):  
M. Y. Yao ◽  
B. X. Zhou ◽  
Q. Li ◽  
W. P. Zhang ◽  
L. Zhu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Mass Fraction ◽  
Zirconium Alloys ◽  
Deionized Water ◽  
Second Phase ◽  
Micro Structure ◽  
Second Phase Particles ◽  
Structure Observation

In order to investigate systematically the effect of Bi addition on the corrosion resistance of zirconium alloys, different zirconium-based alloys, including Zr-4 (Zr-1.5Sn-0.2Fe-0.1Cr), S5 (Zr-0.8Sn-0.35Nb-0.4Fe-0.1Cr), T5 (Zr-0.7Sn-1.0Nb-0.3Fe-0.1Cr) and Zr-1Nb, were adopted to prepare the zirconium alloys containing Bi of 0∼0.5% in mass fraction. These alloys were denoted as Zr-4+xBi, S5+xBi, T5+xBi and Zr-1Nb+xBi, respectively. The corrosion behavior of these specimens was investigated by autoclave testing in lithiated water with 0.01 M LiOH or deionized water at 360°C/18.6 MPa and in superheated steam at 400 °C/10.3 MPa. The micro structure of the alloys was examined by TEM and the second phase particles (SPPs) were analyzed by EDS. Micro structure observation shows that the addition of Bi promotes the precipitation of Sn as second phase particles (SPPs) because Sn is in solid solution in α-Zr matrix in Zr-4, S5 and T5 alloys. The concentration of Bi dissolved in α-Zr matrix increase with the increase of Nb in the alloys, and the excess Bi precipitates as Bi-containing SPPs. The corrosion results show that the effect of Bi addition on the corrosion behavior of different zirconium-based alloys is very complicated, depending on their compositions and corrosion conditions. In the case of higher Bi concentration in α-Zr, the zirconium alloys exhibit better corrosion resistance. However, in the case of precipitation of Bi-containing SPPs, the corrosion resistance gets worse. This indicates that the solid solution of Bi in α-Zr matrix can improve the corrosion resistance, while the precipitation of the Bi-containing SPPs is harmful to the corrosion resistance.

Decarbonylation Kinetics of Formic Acid in Aqueous Sulphuric Acid Solutions

1976 ◽  
Vol 318 (2) ◽  
pp. 202-206 ◽  
Author(s):  
G. Ciuhandu ◽  
A. Dumitreanu ◽  
Z. Simon
Keyword(s):  
Formic Acid ◽  
Sulphuric Acid ◽  
Acid Solutions ◽  
Kinetics Of

MOLECULAR WEIGHT AND DISSOCIATION BEHAVIOR OF α- AND β-LIPOVITELLIN IN ACID SOLVENTS

1962 ◽  
Vol 40 (1) ◽  
pp. 877-883 ◽  
Author(s):  
J. P. Kratohvil ◽  
W. G. Martin ◽  
W. H. Cook
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Quantitative Study ◽  
Acid Solutions ◽  
Solubility Behavior ◽  
And Diffusion

Solutions of α-lipovitellin in 1 M formic acid and 0.01 M hydrochloric acid had two sedimenting components of ca. 2.0 S and 4.6 S. Initially, acid solutions of β-lipovitellin contained only the 4.6 S component but, after about 4 days, the 2.0 S component was also present. Using freshly prepared solutions the molecular weight (M) of this 4.6 S component of β-lipovitellin was established as 3.9 × 105 by both light scattering and sedimentation and diffusion measurements. This component appears, therefore, to be the associated form of β-lipovitellin of 11 S and M = 4.0 × 105 in neutral solvents. The 2.0 S component must therefore be a dissociated subunit of comparable or smaller size than the subunit of 7 S and M = 2.0 × 105 in alkaline solvents. Evidently both lipovitellins dissociate in acid, as they do in alkaline solvents, but the solubility behavior and irreversible changes that occur in acid precluded a quantitative study.

Corrosion resistance of nanostructured films of titanium diboride in mineral acid solutions

2016 ◽  
Vol 52 (4) ◽  
pp. 618-621 ◽  
Author(s):  
I. I. Korobov ◽  
G. V. Kalinnikov ◽  
A. V. Ivanov ◽  
N. N. Dremova ◽  
R. A. Andrievski ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Diboride ◽  
Mineral Acid ◽  
Acid Solutions ◽  
Nanostructured Films
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