A study on the modeling of parameters affecting the Ir drop mechanism in the initiation stage of crevice corrosion

2000 ◽  
Vol 6 (6) ◽  
pp. 505-511 ◽  
Author(s):  
Hyun-Young Chang ◽  
Yong-Soo Park ◽  
Woon-Suk Hwang
Keyword(s):  
Crevice Corrosion ◽  
Ir Drop ◽  
Initiation Stage

A critical crevice solution and IR drop crevice corrosion model

2008 ◽  
Vol 50 (6) ◽  
pp. 1716-1725 ◽  
Author(s):  
Glyn F. Kennell ◽  
Richard W. Evitts ◽  
Kevin L. Heppner
Keyword(s):  
Crevice Corrosion ◽  
Ir Drop ◽  
Corrosion Model

Modeling of crevice solution chemistry on the initiation stage of crevice corrosion in Fe-Cr alloys

1998 ◽  
Vol 4 (6) ◽  
pp. 1199-1206 ◽  
Author(s):  
Hyun-Young Chang ◽  
Yong- Soo Park ◽  
Woon- Suk Hwang
Keyword(s):  
Crevice Corrosion ◽  
Solution Chemistry ◽  
Initiation Stage

scholarly journals Estimation of Potential Distribution during Crevice Corrosion through Analysis of I–V Curves Obtained by LAPS

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2873
Author(s):  
Kiyomi Nose ◽  
Ko-ichiro Miyamoto ◽  
Tatsuo Yoshinobu
Keyword(s):  
Crevice Corrosion ◽  
Potential Distribution ◽  
Corrosion Current ◽  
Experimental Methods ◽  
Narrow Gap ◽  
Anodic Current ◽  
Ph Change ◽  
Ir Drop ◽  
A Value ◽  
Light Addressable Potentiometric Sensor

Crevice corrosion is a type of local corrosion which occurs when a metal surface is confined in a narrow gap on the order of 10 μm filled with a solution. Because of the inaccessible geometry, experimental methods to analyze the inner space of the crevice have been limited. In this study, a light-addressable potentiometric sensor (LAPS) was employed to estimate the potential distribution inside the crevice owing to the IR drop by the anodic current flowing out of the structure. Before crevice corrosion, the I–V curve of the LAPS showed a potential shift, depending on the distance from the perimeter. The shift reflected the potential distribution due to the IR drop by the anodic current flowing out of the crevice. After crevice corrosion, the corrosion current increased exponentially, and a local pH change was detected where the corrosion was initiated. A simple model of the IR drop was used to calculate the crevice gap, which was 12 μm—a value close to the previously reported values. Thus, the simultaneous measurement of the I–V curves obtained using a LAPS during potentiostatic electrolysis could be applied as a new method for estimating the potential distribution in the crevice.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

ALLEGHENY LUDLUM AL276

Alloy Digest ◽  
1996 ◽  
Vol 45 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Power Plant ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Crevice Corrosion ◽  
Heat Treating ◽  
Chemical Plants ◽  
Temperature Performance

Abstract Allegheny Ludlum AL276 is widely used in the most severe environments found in chemical plants and in power plant desulfurization systems. The high molybdenum level with tungsten gives excellent pitting and crevice corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Ni-497. Producer or source: Allegheny Ludlum Corporation.

NICROFER 5716 HMoW

Alloy Digest ◽  
1985 ◽  
Vol 34 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Stress Corrosion Cracking ◽  
Crevice Corrosion ◽  
Corrosion Cracking ◽  
Low Carbon ◽  
Nickel Chromium ◽  
Corrosion Pitting

Abstract NICROFER 5716 HMoW is a nickel-chromium-molybdenum alloy with tungsten and extremely low carbon and silicon contents. It has excellent resistance to crevice corrosion, pitting and stress-corrosion cracking. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: Ni-324. Producer or source: Vereingte Deutsche Metallwerke AG.

ALLEGHENY LUDLUM AL 22

Alloy Digest ◽  
2000 ◽  
Vol 49 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Crevice Corrosion ◽  
High Nickel ◽  
Corrosion Pitting ◽  
High Nickel Alloy

Abstract AL-22 is a wrought 22Cr-13.5Mo-3W-4Fe high-nickel alloy with outstanding and versatile corrosion resistance. The alloy is available in plate and is used where excellent corrosion, pitting, or crevice corrosion resistance is needed. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-559. Producer or source: Allegheny Ludlum Corporation.

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