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anodic pitting

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Published: 01 January 2005
Fig. 39 Effect of temperature on the anodic pitting potential ( E b ) of grade 2 titanium in dilute NaCl and NaBr solutions. SCE, saturated calomel electrode. Source: Ref 158 More
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003822
EISBN: 978-1-62708-183-2
... and insights on the most common forms of corrosion observed with titanium alloys, including general corrosion, crevice corrosion, anodic pitting, hydrogen damage, stress-corrosion cracking, galvanic corrosion, corrosion fatigue, and erosion-corrosion. It also provides practical strategies for expanding...
Image
Published: 01 January 2005
Fig. 24 Number of corrosion pits in anodized aluminum 1100 as a function of coating thickness. Source: Ref 124 More
Image
Published: 01 January 2005
Fig. 7 Corrosion pits observed on (a) uranium, (b) U-4Nb, and (c) U-6Nb after anodic polarization scans in 0.1 M NaCl (room temperature, Ar-purged) More
Image
Published: 15 June 2019
Fig. 25 Number of corrosion pits in anodized aluminum 1100 as a function of coating thickness. Source: Ref 120 More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003674
EISBN: 978-1-62708-182-5
..., and facades, is often anodized. The surface retains less atmospheric dirt and is much easier to clean. The anodic film has the same chemical characteristics as the natural oxide film and is corroded by strong alkalis and strong acids. In industrial atmospheres, the film tends to pit, with the time...
Image
Published: 01 January 2005
Fig. 3 Anodic-polarization curve for aluminum alloy 1100. Specimens were immersed in neutral deaerated NaCl solution free of cathodic reactant. Pitting develops only at potentials more cathodic than the pitting potential, E p . The intersection of the anodic curve for aluminum (solid line More
Image
Published: 15 June 2019
Fig. 3 Anodic-polarization curve for aluminum alloy 1100. Specimens were immersed in neutral deaerated NaCl solution free of cathodic reactant. Pitting develops only at potentials more cathodic than the pitting potential, E p . The intersection of the anodic curve for aluminum (solid line More
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004170
EISBN: 978-1-62708-184-9
... extensive use of dissimilar-metal contacts. Galvanic corrosion, pitting in electrodeposits ( Fig. 1 ), anodic corrosion (oxidation of a metal, such as aluminum, at the anode sites), and cathodic corrosion (attack on cathodically biased aluminum by a hydroxyl ion from cathodic reduction of oxygen or water...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003815
EISBN: 978-1-62708-183-2
.... Pitting develops only at potentials more cathodic than the pitting potential, E p . The intersection of the anodic curve for aluminum (solid line) with a curve for the applicable cathodic reaction (one of the representative dashed lines) determines the potential to which the aluminum is polarized...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003644
EISBN: 978-1-62708-182-5
... Electrochemical impedance spectroscopy scans Miscellaneous tests Hydrogen permeation Anodized aluminum corrosion test Electrolytic corrosion test Paint adhesion on a scribed surface Impedance test for anodized aluminumodized Critical pitting temperature The galvanic current flowing...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... corrosion, pitting and crevice corrosion, intergranular corrosion, and velocity-affected corrosion. The article contains a table that lists combinations of alloys and environments subjected to selective leaching and the elements removed by leaching. corrosion crevice corrosion dealuminification...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005683
EISBN: 978-1-62708-198-6
... to those in active pits and causes active corrosion in the interior of the crevice. Initiation of the crevice corrosion attack occurs above a potential, which causes the anodic reactions to proceed at a rate that maintains the aggressive environment in the interstice. Lowering the potential below...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003827
EISBN: 978-1-62708-183-2
...-silicon weld material showed cathodic protection of the weld zone and anodic dissolution of the beryllium, which included some pitting ( Ref 20 ). Beryllium precipitate in the weld zone did dissolve, but no corrosion of the aluminum-silicon matrix was observed. Microbial Corrosion Microbial...
Image
Published: 01 January 1997
Fig. 22 Schematic representation of critical pitting potential, E pit , due to anodic polarization. Source: Ref 5 More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... such as copper, mercury, or lead. Some aluminum alloys are used for sacrificial anodes in seawater. An active, anodic alloy is used to clad aluminum, protecting it against pitting in some applications. Contact of aluminum with more cathodic metals should be avoided in any environment in which aluminum...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003586
EISBN: 978-1-62708-182-5
... interest to define these thresholds than it is to determine the rates in the regions where corrosion rates are high. Examples of the latter are pitting or crevice corrosion where passive films are broken down and local corrosion rates can be extremely high. This article addresses electrochemical methods...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... Simulated-Use Tests Corrosion Rates and Types Analysis of Incomplete Data Examples of Corrosion Failure Analysis Example 1: Analysis of Pitting and MIC of Stainless Steel Piping On-Site Examination Anodic Protection Galvanic Protection Cathodic Protection Anodic Inhibitors...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003618
EISBN: 978-1-62708-182-5
... particles are well known sites for pit initiation, due to galvanic interaction with the surrounding matrix ( Ref 4 , 5 , 6 , 7 ). Depending on initial composition, some constituent particles are cathodic to the matrix, and others are anodic. Some exhibit a changing galvanic effect as the corrosion...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003612
EISBN: 978-1-62708-182-5
... is considered to be autocatalytic in nature; once a pit starts to grow, the local conditions are altered such that further pit growth is promoted. The anodic and cathodic electrochemical reactions that comprise corrosion separate spatially during pitting ( Fig. 2 ). The local pit environment becomes depleted...