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crevice corrosion
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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003662
EISBN: 978-1-62708-182-5
... Abstract Crevice corrosion is a form of localized corrosion that affects many alloys that normally exhibit passive behavior. This article discusses the frequently used crevice corrosion testing and evaluation procedures. These procedures include specific crevice corrosion tests, multiple...
Abstract
Crevice corrosion is a form of localized corrosion that affects many alloys that normally exhibit passive behavior. This article discusses the frequently used crevice corrosion testing and evaluation procedures. These procedures include specific crevice corrosion tests, multiple-crevice assembly tests, cylindrical materials and products evaluation, component testing, electrochemical tests, and mathematical modeling.
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003613
EISBN: 978-1-62708-182-5
... Abstract Crevice corrosion involves three fundamental types of processes such as electrochemical reactions, homogeneous chemical reactions, and mass transport. This article describes the critical factors of crevice corrosion, including crevice geometry, material, environment, crevice corrosion...
Abstract
Crevice corrosion involves three fundamental types of processes such as electrochemical reactions, homogeneous chemical reactions, and mass transport. This article describes the critical factors of crevice corrosion, including crevice geometry, material, environment, crevice corrosion stifling, and pitting relationships. It explains the crevice corrosion of stainless steel, nickel alloys, aluminum alloys, and titanium alloys with examples. The article reviews the types of testing methods that have been developed for differentiating and ranking the resistance of alloys toward crevice corrosion. It also presents the strategies for the prevention of crevice corrosion or lessening its effects, such as design awareness, use of inhibitors, and electrochemical control methods.
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Published: 01 January 2006
Fig. 2 Mechanism of crevice corrosion at a joint. Crevice corrosion is common at weldments or sheet metal joints (a) and can occur in apparently sealed lap joints (b).
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Published: 01 January 1990
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Published: 01 January 2005
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Published: 01 January 2005
Fig. 46 Effect of crevice gap and depth on the initiation of crevice corrosion in various stainless steels and alloy 625. The gaps and depths below and to the right of the curve for each material define crevice geometries where initiation of crevice corrosion is predicted by the mathematical
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Published: 01 January 2006
Fig. 4 Mechanism of pitting corrosion. As with crevice corrosion, pitting occurs in localized areas that are depleted of oxygen, low in pH, and high in chlorides.
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Published: 01 January 1990
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Published: 01 October 2014
Fig. 16 Appearance of three specimens at the end of a weeklong crevice corrosion test in natural seawater, at room temperature, under an applied potential of 300 mV. (a) Alloy 625. Crevice formation initiated after 60 h; 3 mil crevice cut evident at end of week. Source: Ref 45 . (b
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in Wrought Titanium and Titanium Alloys
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 10 Crevice corrosion of Ti-0.3Mo-0.8Ni and grade 2 unalloyed Ti in saturated NaCl solution. Shaded band represents transition zone between active and passive behavior.
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Published: 01 January 2006
Fig. 3 Critical crevice corrosion temperature as a function of the pitting resistance equivalent number (PREN) and alloy type. Crevice corrosion will not occur below the temperature indicated but will above. Tests made in 6% ferric chloride. Source: Ref 5
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Published: 01 January 2006
Fig. 9 Severe crevice corrosion of aluminum plate under the antenna mounts resulting from the absence of sealant in the joints
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Published: 01 January 2006
Fig. 1 Minimum levels of chloride that cause pitting and crevice corrosion in 30 days in SO 2 -saturated chloride solutions at 80 °C (175 °F). Source: Ref 1
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in Corrosion of Containment Materials for Radioactive-Waste Isolation
> Corrosion: Environments and Industries
Published: 01 January 2006
Fig. 5 Typical appearance of crevice corrosion formed on MA alloy 22 when tested using cyclic potentiodynamic polarization in 1 M NaCl at 90 °C (195 °F). The grain-boundary etching appearance is typical of a hot reducing HCl solution that may be forming inside of the crevice. Specimen
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Published: 01 January 2005
Fig. 10 Risk of pitting (solid line) and crevice corrosion (dashed line) of standard grades of stainless steel in oxygen-saturated waters with varying chloride levels. Source: Ref 13
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Published: 01 January 2005
Fig. 11 Risk of pitting (solid line) and crevice corrosion (dashed line) of higher-alloyed stainless steels in oxygen-saturated waters with varying chloride levels. Dotted line is a plate heat exchanger. Source: Ref 13
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Published: 01 January 2005
Fig. 12 Crevice corrosion sites attacked in seawater exposure at 35 °C (95 °F) for various stainless steels having different ferric chloride critical crevice temperatures. Source: Ref 16
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Published: 01 January 2005
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Published: 01 January 2005
Fig. 2 Schematic showing the mechanism of crevice corrosion for titanium in aqueous chloride media
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Published: 01 January 2005
Fig. 3 Crevice corrosion attack of unalloyed titanium coupon surfaces within tight gasket-to-metal crevices after exposure to hot chloride brines. (a) Before cleaning. (b) After cleaning
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