Pitting Corrosion and Fatigue Crack Nucleation

Chen, Gim S.; Liao, Chi-Min; Wan, K.-C.; Gao, Ming; Wei, Robert P.

doi:10.1520/stp19951s

Cited by 24 publications

(29 citation statements)

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“…[1][2][3][4][5][6] In AA2024-T3 (UNS A92024), (1) pit initiation sites include Al-Cu-Mg particles, 1 the periphery of Cu-enriched Al-Cu-Mg particles that have been dealloyed of Al and Mg, 2 and the matrix adjacent to Al-Cu-Fe-Mn particles. 3 In fact, coalesced pit sites that promote fatigue initiation often are formed near constituent particles. 3 It is well known that chromate conversion coating (CCC) and anodization of Al precipitation age-hardened alloys improve localized corrosion resistance, particularly in chloride salt spray testing.…”

Section: Introductionmentioning

confidence: 99%

“…3 In fact, coalesced pit sites that promote fatigue initiation often are formed near constituent particles. 3 It is well known that chromate conversion coating (CCC) and anodization of Al precipitation age-hardened alloys improve localized corrosion resistance, particularly in chloride salt spray testing. [1][2][7][8] Improvements in the localized corrosion performance of such surfacetreated alloys suggests that either one or more of the four stages of localized corrosion at the anode site (i.e., nucleation, stabilization, growth, and repassivation) or the properties of cathode sites (e.g., cathodic intermetallic phases and replated Cu) are altered by the presence of the CCC.…”

Section: Introductionmentioning

confidence: 99%

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Mass-Transport-Limited Oxygen Reduction Reaction on AA2024-T3 and Selected Intermetallic Compounds in Chromate-Containing Solutions

Ilevbare¹,

Scully²

2001

CORROSION

106

118

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Oxygen reduction reaction (ORR) kinetics were investigated on synthesized Al-Cu, Al-Cu-Mg, and Al-Cu-Fe-Mn intermetallic phases and compared toAA2024-T3 (UNS A92024), as well as high-purity Al, Cu, and Au. These tests were conducted in 0.1 M sodium sulfate (Na 2 SO 4 ) with and without either 0.005 M sodium chloride (NaCl, pH 6), 0.01 M sodium chromate (Na 2 CrO 4 , pH 8), or 0.0062 M Na 2 CrO 4 + 0.0038 M chromic acid (H 2 CrO 4 , pH 6) additions using stationary and rotating disk electrodes. Mass-transport-rate-controlled ORR were near theoretical values on all Cu-bearing materials and Au in 0.1 M Na 2 SO 4 with and without 0.005 M NaCl. Theoretical limiting current densities (CD) were not achieved in the mass-transport-controlled regime on Al because of the rate limitation of electron transfer through its oxide film. Four effects of chromate additions on such cathodic reaction rates were identified as follows: -Little intrinsic effect of chromate pretreatment on masstransport-controlled ORR on high-purity Cu, Cu-containing Al-based intermetallics, and Au electrodes in the absence of open-circuit corrosion. Charge transfer-controlled and mixedcontrolled ORR are lowered possibly by the blocking of O 2 adsorption sites by chromate anions. -Decreased net cathodic kinetics on AA2024-T3 as a function of the degree to which chromate suppressed open-circuit pitting corrosion prior to cathodic polarization. -Increased net cathodic kinetics on high-purity Al. -Decreased ORR kinetics on S-Al 2 CuMg as a result of minimization of Al(Mg) dissolution and, subsequently, minimization of the formation of a high, Cu-rich surface. Comments are made regarding the influence of each of these phenomena on open-circuit pitting of AA2024-T3.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass-Transport-Limited Oxygen Reduction Reaction on AA2024-T3 and Selected Intermetallic Compounds in Chromate-Containing Solutions

Ilevbare¹,

Scully²

2001

CORROSION

106

118

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“…Pits will cause cracks to nucleate faster. As reported by Wei and coworkers, pitting corrosion in aluminum alloys is essentially associated with constituent particles (Chen et al, 1997). Individual particle-induced pits then coalesce to form large pits.…”

Section: Pitting Corrosion and Fatiguementioning

confidence: 71%

“…Material degradation due to corrosion and corrosion fatigue has been recognized to significantly affect the airworthiness of civilian and military aircraft, especially for the current fleet of airplanes that have served beyond their initial design life (Chen et al, 1997). Aircraft-joints are the most corrosion-and fatigue-susceptible areas on an aircraft (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Review and Study of Physics Driven Pitting Corrosion Modeling in 2024-T3 Aluminum Alloys (Postprint)

Yu¹,

Jata²

2015

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING/MONITORING AGENCY REPORT NUMBER(S)AFRL-RX-WP-JA-2015-0218 DISTRIBUTION/AVAILABILITY STATEMENTDistribution Statement A. Approved for public release: distribution unlimited. SUPPLEMENTARY NOTES Journal article published in ABSTRACTMaterial degradation due to corrosion and corrosion fatigue has been recognized to significantly affect the airworthiness of civilian and military aircraft, especially for the current fleet of airplanes that have served beyond their initial design life. The ability to predict the corrosion damage development in aircraft components and structures, therefore, is of great importance in managing timely maintenance for the aging aircraft vehicles and in assisting the design of new ones. The assessment of aircraft corrosion and its influence on fatigue life relies on appropriate quantitative models that can evaluate the initiation of the corrosion as well as the accumulation during the period of operation. Beyond the aircraft regime, corrosion has also affected the maintenance, safety and reliability of other systems such as nuclear power systems, steam and gas turbines, marine structures and so on. In the work presented in this paper, we reviewed and studied several physics based pitting corrosion models that have been reported in the literature. The classic work of particle induced pitting corrosion by Wei and Harlow is reviewed in detail. Two types of modeling, a power law based simplified model and a microstructure based model, are compared for 2024-T3 alloy. Data from literatures are used as model inputs. The paper ends with conclusions and recommendations for future work. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Mechanical Engineering ABSTRACTMaterial degradation due to corrosion and corrosion fatigue has been recognized to significantly affect the airworthiness of civilian and military aircraft, especially for the current fleet of airplanes that have served beyond their initial design life. The ability to predict the corrosion damage development in aircraft components and structures, therefore, is of great importance in managing timely maintenance for the aging aircraft vehicles and in assisting the design of new ones. The assessment of aircraft corrosion and its influence on fatigue life relies on appropriate quantitative models that can evaluate the initiation of the corrosion as well as the accumulation during the period of operation. Beyond the aircraft regime, corrosion has also affected the maintenance, safety and reliability of other systems...

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“…The Ce +3 supplied signifi cantly decreased the maximum corrosion pit sizes on the AA 2024-T3 surface below a critical size. This is important in aerospace structural materials, such as fuselage and wing skins, because large corrosion pits above approximately 110 μ m greatly reduce fatigue life (Chen et al , 1997;Rokhlin et al , 1999).…”

Section: On-demand Active-corrosion Inhibition Based On Tunable Al-tmmentioning

confidence: 99%

Tunable multifunctional corrosion-resistant metallic coatings containing rare earth elements

Scully

Tailleart

Presuel-Moreno

2014

Rare Earth-Based Corrosion Inhibitors

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Pitting Corrosion and Fatigue Crack Nucleation

Cited by 24 publications

References 0 publications

Mass-Transport-Limited Oxygen Reduction Reaction on AA2024-T3 and Selected Intermetallic Compounds in Chromate-Containing Solutions

Mass-Transport-Limited Oxygen Reduction Reaction on AA2024-T3 and Selected Intermetallic Compounds in Chromate-Containing Solutions

Review and Study of Physics Driven Pitting Corrosion Modeling in 2024-T3 Aluminum Alloys (Postprint)

Tunable multifunctional corrosion-resistant metallic coatings containing rare earth elements

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