Corrosion of metals and alloys. Guidelines for the evaluation of pitting corrosion

2020 ◽  
Keyword(s):  
Pitting Corrosion ◽  
Metals And Alloys

scholarly journals A REVIEW: BEHAVIOR OF PITTING CORROSION IN MANUFACTURING FOOD EQUIPMENT

2019 ◽  
Vol 50 (4) ◽  
Author(s):  
Alwan & et al.
Keyword(s):  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Corrosion Damage ◽  
Metals And Alloys ◽  
Corrosion Products ◽  
Corrosion Mechanism ◽  
Uniform Corrosion ◽  
Layer Surface ◽  
Material Layer ◽  
Localized Form

Corrosion is the deterioration or destruction of metals and alloys in the presence of an environment by chemical or electrochemical means. The phenomenon of corrosion behavior studies is three elements include economic, safety and maintenance. Pitting corrosion is a localized form of corrosion by which cavities or "holes" are produced interring the material layer surface. It's considered to be more dangerous than uniform corrosion damage because it is more difficult to detect, predict and design against. Pitting corrosion can produce pits with open holes or covered with a semi-permeable capsule of corrosion products. In this review, we study about the pitting corrosion mechanism and stages in the manufacture food equipment metals in different conditions and environment.

scholarly journals Mechanism of Pitting Corrosion Protection of Metals and Alloys

2016 ◽  
Vol 32 (2) ◽  
pp. 845-850 ◽  
Author(s):  
Vladimir Grachev ◽  
Andrei Rozen ◽  
Gennadii Vasilievich ◽  
Andrei Rozen
Keyword(s):  
Corrosion Protection ◽  
Pitting Corrosion ◽  
Metals And Alloys ◽  
Protection Of Metals

Some Applications of the U. S. Steel MVEM

1973 ◽  
Vol 31 ◽  
pp. 4-5
Author(s):  
J. S. Lally ◽  
L. E. Thomas ◽  
R. M. Fisher
Keyword(s):  
Electron Diffraction ◽  
Debye Temperature ◽  
Metals And Alloys ◽  
Critical Voltage ◽  
Dynamical Diffraction ◽  
Phase Structures ◽  
Structure Factors ◽  
Local Bonding ◽  
Diffraction Phenomenon ◽  
Multi Phase

A variety of materials containing many different microstructures have been examined with the USS MVEM. Three topics have been selected to illustrate some of the more recent studies of diffraction phenomena and defect, grain and multi-phase structures of metals and minerals.(1) Critical Voltage Effects in Metals and Alloys - This many-beam dynamical diffraction phenomenon, in which some Bragg resonances vanish at certain accelerating voltages, Vc, depends sensitively on the spacing of diffracting planes, Debye temperature θD and structure factors. Vc values can be measured to ± 0.5% in the HVEM ana used to obtain improved extinction distances and θD values appropriate to electron diffraction, as well as to probe local bonding effects and composition variations in alloys.

ELECTRONIC RELAXATION IN RARE EARTH METALS AND ALLOYS - A NON-KRAMERS EXAMPLE : Tm3+

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-25-C1-31 ◽  
Author(s):  
N. S. Dixon ◽  
L. S. Fritz ◽  
Y. Mahmud ◽  
B. B. Triplett ◽  
S. S. Hanna ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Metals And Alloys ◽  
Electronic Relaxation

Analysis of field uniformity and quantitative evaluation of subsurface pitting corrosion in conductors via GPEC

2020 ◽  
Vol 64 (1-4) ◽  
pp. 19-29
Author(s):  
Shuting Ren ◽  
Yong Li ◽  
Bei Yan ◽  
Jinhua Hu ◽  
Ilham Mukriz Zainal Abidin ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Eddy Current ◽  
Pitting Corrosion ◽  
Gradient Field ◽  
Uniform Field ◽  
Eddy Current Method ◽  
Optimal Position ◽  
Pulsed Eddy Current ◽  
Field Uniformity ◽  
Processing Algorithms

Structures of nonmagnetic materials are broadly used in engineering fields such as aerospace, energy, etc. Due to corrosive and hostile environments, they are vulnerable to the Subsurface Pitting Corrosion (SPC) leading to structural failure. Therefore, it is imperative to conduct periodical inspection and comprehensive evaluation of SPC using reliable nondestructive evaluation techniques. Extended from the conventional Pulsed eddy current method (PEC), Gradient-field Pulsed Eddy Current technique (GPEC) has been proposed and found to be advantageous over PEC in terms of enhanced inspection sensitivity and accuracy in evaluation and imaging of subsurface defects in nonmagnetic conductors. In this paper two GPEC probes for uniform field excitation are intensively analyzed and compared. Their capabilities in SPC evaluation and imaging are explored through simulations and experiments. The optimal position for deployment of the magnetic field sensor is determined by scrutinizing the field uniformity and inspection sensitivity to SPC based on finite element simulations. After the optimal probe structure is chosen, quantitative evaluation and imaging of SPC are investigated. Signal/image processing algorithms for SPC evaluation are proposed. Through simulations and experiments, it has been found that the T-shaped probe together with the proposed processing algorithms is advantageous and preferable for profile recognition and depth evaluation of SPC.

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