THE RESEARCH OF POSSIBILITY OF GALVANIC CORROSION IN BRAZED CONNECTIONS USED IN AVIATION ENGINE CONSTRUCTION

2021 ◽  
pp. 3-13
Author(s):  
E.N. Kablov ◽  
◽  
A.E. Kutyrev ◽  
A.I. Vdovin ◽  
I.A. Kozlov ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Electrochemical Methods ◽  
Chloride Solutions ◽  
Engine Construction

The article presents the results of researche of galvanic corrosion possibility of brazed connections of steels 13Сr11Ni2W2MoV and 12Cr18Ni10Тi with use of the solders VPr4 and VPr50, which are used in design of aviation engineering engines. The research was carried out by electrochemical methods. Corrosion currents’ density and contact pairs’ potentials in chloride solutions have been determined. It is determined that 13Сr11Ni2W2MoV steel can be exposed to galvanic corrosion in a place of brazed connection. Thus the greatest danger to it is represented by VPr4 solder. The mechanism of corrosion of 13Сr11Ni2W2MoV steel in neutral environments has been examined and recommendations about its protection against galvanic corrosion are made.

Effects of Flow Velocity, pH, and Temperature on Galvanic Corrosion in Alkaline-Chloride Solutions

CORROSION ◽  
2003 ◽  
Vol 59 (2) ◽  
pp. 121-129 ◽  
Author(s):  
J.-G. Kim ◽  
Y.-S. Choi ◽  
H.-D. Lee ◽  
W.-S. Chung
Keyword(s):  
Flow Velocity ◽  
Galvanic Corrosion ◽  
Chloride Solutions

The Effect of Surface Treatments and Electrochemical Methods on the Pitting Potentials of Zirconium in Chloride Solutions

CORROSION ◽  
1982 ◽  
Vol 38 (5) ◽  
pp. 265-273 ◽  
Author(s):  
Donald R. Knittel ◽  
Michael A. Maguire ◽  
Arturo Bronson ◽  
Jong-Sheng Chen
Keyword(s):  
Surface Treatments ◽  
Electrochemical Methods ◽  
Chloride Solutions ◽  
Effect Of Surface

Imaging molecules adsorbed onto electrodes under potential control by scanning probe microscopy

1991 ◽  
Vol 49 ◽  
pp. 376-377 ◽  
Author(s):  
N.J. Tao ◽  
J.A. DeRose ◽  
P.I. Oden ◽  
S.M. Lindsay
Keyword(s):  
Surface Charge ◽  
Environmental Effects ◽  
Scanning Probe Microscopy ◽  
Statistical Significance ◽  
Electrochemical Methods ◽  
Surface Structures ◽  
Scanning Probe ◽  
Potential Control ◽  
Afm Imaging ◽  
Special Circumstances

Clemmer and Beebe have pointed out that surface structures on graphite substrates can be misinterpreted as biopolymer images in STM experiments. We have been using electrochemical methods to react DNA fragments onto gold electrodes for STM and AFM imaging. The adsorbates produced in this way are only homogeneous in special circumstances. Searching an inhomogeneous substrate for ‘desired’ images limits the value of the data. Here, we report on a reversible method for imaging adsorbates. The molecules can be lifted onto and off the substrate during imaging. This leaves no doubt about the validity or statistical significance of the images. Furthermore, environmental effects (such as changes in electrolyte or surface charge) can be investigated easily.

Corrosion of Electronic and Magnetic Devices and Materials

1996 ◽  
Vol 451 ◽  
Author(s):  
Gerald S. Frankel
Keyword(s):  
Thin Film ◽  
Failure Modes ◽  
Galvanic Corrosion ◽  
Potential Drop ◽  
Magnetic Devices ◽  
Disk Structure ◽  
Magnetic Layers ◽  
Ohmic Potential Drop ◽  
Corrosion Problem ◽  
Corrosion Susceptibility

ABSTRACTCorrosion of thin film structures commonly used in electronic and magnetic devices is discussed. Typical failure modes are presented, and galvanic corrosion is discussed in some detail since it is one common problem with such devices. A graphical explanation for the determination of the ohmic potential drop during galvanic corrosion is presented. The corrosion problem of thin film disks is shown to have changed during the past ten years owing to changes in disk structure. The corrosion susceptibility of two antiferromagnetic alloys used for exchange coupling to soft magnetic layers is discussed.

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