Electrochemical Behavior of the T<sub>1</sub>(Al<sub>2</sub>CuLi) Intermetallic Compound and Its Role in Localized Corrosion of Al-2% Li-3% Cu Alloys

Buchheit, R. G.; Moran, James P.; Stoner, G. E.

doi:10.5006/1.3293500

Cited by 120 publications

(74 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Al 2 CuLi acts as an anode relative to the matrix. Its corrosion rate is lowered by a factor of about 25 as pH increases from 3 to 11 [62]. Its corrosion behavior is similar to that of Al 2 CuMg: it initially corrodes as an anode through selective dissolution of Li, and then switches to cathodic behavior, inducing corrosion of the surrounding matrix [23,62,63,71].…”

Section: Mg/li-containing Particlesmentioning

confidence: 73%

“…Al 3 Fe induces corrosion of the surrounding matrix acting as a cathode due to its high corrosion potential relative to the Al-rich matrix and is, therefore, detrimental to the corrosion resistance of these alloys [11]. The effect of this galvanic corrosion is attributed to its good catalytic ability to support oxygen reduction reactions and hydrogen evolution [101]. However, incorporation of Mn in Fe-containing particles can alleviate galvanic interactions by decreasing the potential difference between the particles and the matrix [81].…”

Section: Fe/ti/zr/ta-containing Particlesmentioning

confidence: 99%

See 1 more Smart Citation

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Dang

2017

Metals

View full text Add to dashboard Cite

Abstract:The heterogeneous structure of Al alloys renders them susceptible to localized corrosion due to the different electrochemical properties existing in the Al-rich solid solution matrix and secondary phase particles. The galvanic interactions between these two phases can result in pit formation either through dissolution of the particles or corrosion of the matrix adjacent to the particles. This detrimentally localized corrosion behavior is closely related to the corrosion properties of the particles and the Al-rich matrix. The comprehensive characterization of this behavior under various and varying conditions is critical to understanding the mechanism of pit formation, selecting appropriate inhibitors, and developing protection strategies. The corrosion properties (corrosion potential, pitting potential and corrosion rate) of both secondary phase particles and Al-solid solutions in Al alloys are summarized in this review, aiming to provide a database for corrosion research applicable to the localized corrosion of Al alloys.

show abstract

Section: Mg/li-containing Particlesmentioning

confidence: 73%

Section: Fe/ti/zr/ta-containing Particlesmentioning

confidence: 99%

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Dang

2017

Metals

View full text Add to dashboard Cite

show abstract

“…Since the main grain boundary precipitates in AA2099-T8 alloy are T 1 phase, 29 the anodic films formed from the grain boundary regions were also more susceptible to dissolution in the anodizing bath compared to the film formed from the grain matrix at relatively high temperatures, leading to the development of grain boundary grooves in the anodic film.…”

Section: Resultsmentioning

confidence: 99%

Effect of Anodizing Parameters on Film Morphology and Corrosion Resistance of AA2099 Aluminum-Lithium Alloy

Zhou

Liao

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

The effect of anodization temperature and tartaric acid concentration on the morphology and corrosion resistance of the anodic film formed on AA2099-T8 alloy in tartaric-sulfuric acid was investigated. It was found that the dissolution of the anodic film during anodizing led to increased pore size, rod-shaped cavities and grain boundary grooves in the anodic films. The rod-shaped cavities and grain boundary grooves are associated with selective dissolution of the anodic film formed from fine T 1 (Al 2 CuLi) phase precipitates due to the difference in the reactivity of the films formed from different phases. The increased porosity due to dissolution degraded the corrosion resistance of the anodic film. In the temperature range of 22-47 • C, with 0.53 M tartaric acid addition, anodizing at 42 • C provided the best corrosion performance and a relatively high anodizing efficiency; in the tartaric acid concentration range of 0-0.9 M, at 37 • C, anodizing in electrolytes containing 0.7 and 0.9 M tartaric acid provided good corrosion resistance with little decrease of anodizing efficiency. The corrosive medium did not penetrate the anodic film uniformly but preferentially at local sites, resulting in localized corrosion of the anodized alloy. Aluminum and its alloys are protected from corrosion by an airformed oxide film of several nanometers thickness. However, the protective ability of the air-formed oxide film is limited due to its small thickness. In order to obtain more reliable and durable protection for aluminum and its alloys, a relatively thick oxide film has been pursued. As a case in point, aerospace aluminum alloys are anodized in acidic electrolyte to produce a relatively thick anodic oxide film of a few micrometers, providing the alloys with reasonable corrosion resistance and/or suitable surface for painting and adhesive bonding. Chromic acid anodizing (CAA) used to be the most widely employed anodizing process in aerospace industry.1-3 However, the high toxicity associated with Cr (VI) has restricted the application of CAA. Since 1990s, there have been many efforts to find alternative anodizing process to replace CAA in aerospace industry. [4][5][6] Sulfuric acid anodizing (SAA) is a commonly used, environmentally friendly anodizing process. However, a relatively thicker anodic film is needed for SAA than for CAA if the same corrosion resistance is required. 3On the other hand, increased film thickness will sacrifice fatigue resistance of the anodized components, 3,7-9 not mentioning cost increase. In 1990, Wong et al.3 invented a boric-sulfuric acid anodizing (BSA) process, which modifies the traditional SAA process by reducing the concentration of sulfuric acid and adding boric acid. It is now recognized that the performance of the anodic film produced by BSA is similar to that of the anodic film produced by CAA. 5,10 At the begin of the twenty first century, a new anodizing process, called tartaricsulfuric acid anodizing (TSA), was patented by Alenia Aeronautica S.P.A.11 to compete with BSA. Since th...

show abstract

“…Another ISGC mechanism of 2090 Al-Li alloy was advanced by Buchheit et al [2,3]. They measured the electrochemical behavior of simulated bulk T1 phase and a(Al).…”

Section: Intersubgranular Corrosion (Isgc) Mechanism Of 2195 Al-li Alloymentioning

confidence: 99%

“…Buchheit et al [2,3] thought that the intergranular corrosion (IGC) or intersubgranular corrosion (ISGC) of 2090 Al-Li alloy in NaCl solution was caused by the anodic solution of T1 precipitate, according to the electrochemical behavior of simulated bulk T1. However, Kumai et al [4] suggested that the preferential solution of the precipitates-free zone along grain boundaries cause its intergranular corrosion in NaCl solution, according to the corrosion features.…”

Section: Introductionmentioning

confidence: 99%

Study on localized corrosion mechanism of 2195 Al‐Li alloy in 4.0% NaCl solution (pH 6.5) using a three‐electrode coupling system

Li¹,

Zheng

Jiang

et al. 2005

Materials & Corrosion

View full text Add to dashboard Cite

Study on localized corrosion mechanism of 2195 Al-Li alloy in 4.0% NaCl solution (pH 6.5) using a three-electrode coupling system Localized corrosion morphologies of 2195 Al-Li alloy with various heat treatment in 4.0% NaCl solution (pH 6.5) were investigated, and its corrosion mechanism was studied using a three-electrode coupling system of a (Al) substituting for the precipitate-free zone (PFZ), simulated bulk h 0 (Al 2 Cu) and T1 (Al 2 CuLi). h 0 acts as cathodic zone in the alloy. At the initial stage, T1 phase is active with respect to h 0 and a (Al), and endures the main anodic current, indicating that anodic dissolution occurs on T1. However, its potential moves to positive direction with immersion time, due to dealloying of Li from T1. As a result, the main anodic dissolution occurs on a (Al) at a later stage. At this stage, as only T1 and a (Al) are coupled, T1 is cathodic to a (Al). In real 2195 alloy, T1 phase is very tiny, and anodic dissolution of T1 and PFZ occurs alternately. These results show that its intergranular corrosion or intersubgranular corrosion is caused by alternate anodic dissolution of T1 phase and PFZ along grain and subgrain boundaries.

show abstract

Electrochemical Behavior of the T₁(Al₂CuLi) Intermetallic Compound and Its Role in Localized Corrosion of Al-2% Li-3% Cu Alloys

Cited by 120 publications

References 1 publication

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Effect of Anodizing Parameters on Film Morphology and Corrosion Resistance of AA2099 Aluminum-Lithium Alloy

Study on localized corrosion mechanism of 2195 Al‐Li alloy in 4.0% NaCl solution (pH 6.5) using a three‐electrode coupling system

Contact Info

Product

Resources

About

Electrochemical Behavior of the T1(Al2CuLi) Intermetallic Compound and Its Role in Localized Corrosion of Al-2% Li-3% Cu Alloys

Cited by 120 publications

References 1 publication

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Effect of Anodizing Parameters on Film Morphology and Corrosion Resistance of AA2099 Aluminum-Lithium Alloy

Study on localized corrosion mechanism of 2195 Al‐Li alloy in 4.0% NaCl solution (pH 6.5) using a three‐electrode coupling system

Contact Info

Product

Resources

About

Electrochemical Behavior of the T₁(Al₂CuLi) Intermetallic Compound and Its Role in Localized Corrosion of Al-2% Li-3% Cu Alloys