Determination of the corrosion rate of offshore fixed platforms assemblies in conditions of incomplete certainty of the initial data

2020 ◽  
pp. 50-54
Author(s):  
I.V. Starokon ◽  
◽  
P.K. Kalashnikov ◽  
Keyword(s):  
Corrosion Rate ◽  
Initial Data

Determination of the corrosion rate of powder materials by electrochemical methods

2011 ◽  
Vol 47 (7) ◽  
pp. 921-925 ◽  
Author(s):  
V. I. Kichigin ◽  
O. M. Perel’man ◽  
A. I. Rabinovich ◽  
N. V. Bezmaternykh ◽  
O. P. Koshcheev
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Methods ◽  
Powder Materials

Corrosion Analysis of a Fiber-Optic Transceiver Housing

2001 ◽  
Author(s):  
J. H. Lau ◽  
C. L. Jiaa ◽  
S. J. Erasmus
Keyword(s):  
Relative Humidity ◽  
Corrosion Rate ◽  
Cross Sections ◽  
Weight Change ◽  
Fiber Optic ◽  
Die Casting ◽  
Extinction Ratio ◽  
Optical Power ◽  
Zinc Alloy

Abstract The corrosion responses of a fiber-optic transceiver’s housing with zinc alloy die casting material are investigated in this study. Emphasis is placed on the determination of the weight change and corrosion rate of the housing when it is subjected to a 85% relative humidity and 85°C temperature (85%RH/85°C) test condition. Also, the average light optical power, receiver sensitivity, extinction ratio, and mask margin of transceiver modules subjected to 85%RH/85°C and 3.47V at 500, 1000, 1500, and 1600 hours are provided. Furthermore, metallography is performed on the surfaces and cross sections of the housing. Finally, measurements are made of the thickness of the oxide layer on the surfaces of the fiber-optic transceiver housing.

scholarly journals Dissolution of chromium in sulfuric acid

2002 ◽  
Vol 67 (11) ◽  
pp. 777-782 ◽  
Author(s):  
Dragutin Drazic ◽  
Jovan Popic
Keyword(s):  
Corrosion Rate ◽  
Room Temperature ◽  
Corrosion Potential ◽  
Analytical Data ◽  
Electrochemical Corrosion ◽  
Spectrophotometric Analysis ◽  
Weight Loss Method ◽  
Loss Method ◽  
Anomalous Dissolution

By combining electrochemical corrosion rate measurements and spectrophotometric analysis of the electrolyte it was shown that at room temperature chromium dissolves in deaerated 0.1M Na2SO4 + H2SO4 (pH1) solution as Cr(II) and Cr(III) ions in he ratio Cr(II):Cr(III)?7:1. This process was stable over 4h without any detectable change. The total corrosion rate of chromium calculated from the analytical data is about 12 times higher, than that determined electrochemically by cathodic Tafel line extrapolation to the corrosion potential. This finding was confirmed by applying the weight-loss method for the determination of the corrosion rate. This enormous difference between these experimentally determined corrosion rates can be explained by the rather fast, "anomalous" dissolution process proposed by Kolotyrkin and coworkers (chemical reaction of Cr with H2O molecules) occurring simultaneously with the electrochemical corrosion process.

scholarly journals The Application of Public Data in Forensic Real Estate Valuations: Problems, Limitations, Opportunities

2019 ◽  
Vol 14 (1) ◽  
pp. 24-29
Author(s):  
A. Yu. Butyrin ◽  
V. M. Kruglyakova ◽  
I. A. Shipilova
Keyword(s):  
Real Estate ◽  
Initial Data ◽  
The Body ◽  
Legal Authority ◽  
Data Completeness ◽  
Legal Proceedings ◽  
Public Data ◽  
Judicial Proceedings ◽  
Forensic Expert

One of the problems with the practice of legal proceedings is the determination of the legal authority limits of a forensic expert when he forms an array of initial data, the structure and content of which would provide a full and comprehensive research of the issues put before him by the body (person) having appointed the examination. The possibility of the specifed initial data completeness ensuring is suggested and substantiated in the article, arguments arising from the provisions of the law concerning neutralization of the traditional criticism directions of the expert in this part during his interrogation in the course of judicial proceedings on his conclusion are adduced.

Influence of various sterilization methods on hardness, grain size and corrosion rate of a Mg6Ag-alloy

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Frank Feyerabend ◽  
Martin Johannisson ◽  
Zhidan Liu ◽  
Regine Willumeit-Römer
Keyword(s):  
Grain Size ◽  
Corrosion Rate ◽  
Optimum Ratio ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Materials Properties ◽  
Physiological Conditions ◽  
Alloying System ◽  
Dry Heat

AbstractSterilization is a necessary step for all implant materials. Different methods can influence the materials properties. Especially important for magnesium as degradable materials is the determination of the corrosion properties. In this study the influence of 70% ethanol, glutaraldehyde, autoclaving, dry heat, UV-, gamma- and electron beam-irradiation on mechanical and corrosion parameters were analyzed. As mechanical parameters hardness and grain size were determined. The corrosion rate under physiological conditions, weight of the corrosion layer and corrosion morphology was determined. It could be demonstrated that irradiation treatments and 70% ethanol are suitable methods, as they decrease the corrosion rate. Heat-introducing methods (autoclaving and dry heat) acted as incomplete ageing treatments on this alloy and therefore increased the corrosion rate. Furthermore, osmolality showed a better correlation to the actual corrosion rate than the pH. Therefore an optimum ratio between alloying system, implant and sterilization method has to be established, depending on the intended application.

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