scholarly journals Development of Measurement System for pH Distribution on Metal Surface under Atmospheric Corrosion

2017 ◽  
Vol 81 (11) ◽  
pp. 495-501 ◽  
Author(s):  
Youhei Hirohata ◽  
Kentaro Nishida ◽  
Takumi Haruna ◽  
Kazuhiko Noda
Keyword(s):  
Metal Surface ◽  
Measurement System ◽  
Atmospheric Corrosion ◽  
Ph Distribution

scholarly journals Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion

2020 ◽  
Vol 22 (3) ◽  
pp. 29-37
Author(s):  
Y.J. Aghazada ◽  
V.M. Abbasov ◽  
N.I. Mursalov ◽  
S.E. Abdullayev ◽  
U.J. Yolchuyeva
Keyword(s):  
Metal Surface ◽  
Atmospheric Corrosion ◽  
Isopropyl Alcohol ◽  
Bactericidal Effect ◽  
Corrosion Process ◽  
Inorganic Complexes ◽  
Correlation Constant ◽  
Reducing Bacteria ◽  
Kinetics Of ◽  
Petroleum Acid

AbstractIn the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation.

Observation of micro-droplets on metal surface in early atmospheric corrosion

2005 ◽  
Vol 7 (10) ◽  
pp. 1033-1038 ◽  
Author(s):  
Li Bian ◽  
Yongji Weng ◽  
Xiangyi Li
Keyword(s):  
Metal Surface ◽  
Atmospheric Corrosion

Modeling Corrosion of a Metal under an Aerosol Droplet

2010 ◽  
Vol 654-656 ◽  
pp. 1650-1653 ◽  
Author(s):  
Murali Sankar Venkatraman ◽  
Ivan S. Cole ◽  
Dayalan R. Gunasegaram ◽  
Bosco Emmanuel
Keyword(s):  
Metal Surface ◽  
Atmospheric Corrosion ◽  
Three Dimensional ◽  
Spatial Separation ◽  
Temporal Variations ◽  
Transient Model ◽  
Aerosol Droplet ◽  
Current Densities ◽  
Spatio Temporal ◽  
Kinetics Of

On a metal surface covered with a moisture layer of variable thickness and shape, the dissolved oxygen may induce a spatial separation of the anodic and cathodic reactions on space-time scales characteristic of the roughness, droplet size and the local kinetics of the system. This leads to a spatio-temporal variations in species concentrations, current and potential over the metal surface and thus atmospheric corrosion. Here a fully three-dimensional transient model is developed that addresses the corrosion of a metal under an aerosol droplet. The effects of various parameters, such as exchange current densities, initial concentrations, shape and size of the droplet, and diffusivity of oxygen on ionic, potential and current distributions are investigated.

Electrochemical nucleation and growth of copper on iron and aluminum: A TEM study of industrial copper cementation

1978 ◽  
Vol 36 (1) ◽  
pp. 454-455
Author(s):  
L.E. Murr ◽  
V. Annamalai
Keyword(s):  
Metal Surface ◽  
Copper Deposit ◽  
Nucleation And Growth ◽  
16Th Century ◽  
Electrochemical Reactions ◽  
Mine Shaft ◽  
De Re ◽  
Copper Precipitation ◽  
Electrochemical Nucleation ◽  
Interesting System

Georgius Agricola in 1556 in his classical book, “De Re Metallica”, mentioned a strange water drawn from a mine shaft near Schmölnitz in Hungary that eroded iron and turned it into copper. This precipitation (or cementation) of copper on iron was employed as a commercial technique for producing copper at the Rio Tinto Mines in Spain in the 16th Century, and it continues today to account for as much as 15 percent of the copper produced by several U.S. copper companies.In addition to the Cu/Fe system, many other similar heterogeneous, electrochemical reactions can occur where ions from solution are reduced to metal on a more electropositive metal surface. In the case of copper precipitation from solution, aluminum is also an interesting system because of economic, environmental (ecological) and energy considerations. In studies of copper cementation on aluminum as an alternative to the historical Cu/Fe system, it was noticed that the two systems (Cu/Fe and Cu/Al) were kinetically very different, and that this difference was due in large part to differences in the structure of the residual, cement-copper deposit.

Rapid Freezing of Freeze-Etch Specimens

1980 ◽  
Vol 38 ◽  
pp. 752-755
Author(s):  
A. Elgsaeter ◽  
T. Espevik ◽  
G. Kopstad
Keyword(s):  
Low Temperature ◽  
Metal Surface ◽  
Relative Velocity ◽  
Thermal Contact ◽  
High Rate ◽  
Rapid Freezing ◽  
Temperature Decrease ◽  
Freeze Etching

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.

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