Role of anodic oxide films in the corrosion of aluminum and its alloys

Takahashi, Hiroki; Chiba, Makoto

doi:10.1515/corrrev-2017-0048

Cited by 19 publications

(9 citation statements)

References 40 publications

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“…Due to the high chemical activity of the aluminum element, a dense Al 2 O 3 film is formed on the surface of the aluminum sheet. The existence of the Al 2 O 3 film on the surface of the aluminum sheet avoids the direct exposure of the aluminum sheet to the SSC environment, which reduces the erosion of the aluminum sheet by the salt spray particles [ 35 , 36 , 37 ]. At the same time, the Al 2 O 3 film separates the aluminum sheet and the titanium sheet, which reduces the electrochemical corrosion caused by the direct contact between the two connected sheets.…”

Section: Resultsmentioning

confidence: 99%

Insight of Salt Spray Corrosion on Mechanical Properties of TA1-Al5052 Self-Piercing Riveted Joint

et al. 2022

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Self-piercing riveted (SPR) joints in automobiles inevitably suffer from corrosion damage and performance reduction. In this work, the influence of salt spray corrosion on the mechanical properties of TA1-Al5052 alloy SPR joints was studied. The TA1-5052 SPR joints were prepared and salt spray tests were carried out for different durations. The static and fatigue strengths of the joints after salt spray corrosion were tested to analyze the effect of salt spray duration on the performance of the joints. The results show that the joints’ static strength and fatigue strength decrease with prolonged salt spray time. The salt spray duration affects the joint’s tensile failure mode. The tensile failure without corrosion and with a short salt spray time is the fracture failure of the lower aluminum sheet, and the tensile failure of the joints after a long time of salt spray corrosion is the failure of the rivets. The fatigue failure form of the SPR joint is the formation of fatigue cracks in the lower aluminum sheet, and salt spray time has little effect on the fatigue failure form. Salt spray corrosion can promote the initiation and propagation of fatigue cracks. The fatigue crack initiation area is located at the boundary between the lower aluminum sheet and the rivet leg. The initiation of cracks originates from the wear zones among the sheet metal, rivets, and salt spray particles.

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Section: Resultsmentioning

confidence: 99%

Insight of Salt Spray Corrosion on Mechanical Properties of TA1-Al5052 Self-Piercing Riveted Joint

et al. 2022

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“…The defects can be the Al 9 Co 2 /(Al) interfaces and/or (Al)-grain boundaries where AlFeSi intermetallics reside [40]. Hydrogen evolution during the preceding cathodic polarization may also have caused damage to the surface film existing at E corr [51,52]. More specifically, stage 1 is governed by ionic migration across the pre-existent surface film [53].…”

Section: Corros Mater Degrad 2020 1 For Peer Reviewmentioning

confidence: 99%

“…This blocking action does not, however, ensure inhibition of localized corrosion. The latter depends on the defects present in the structure of the surface film [50] that can be numerous [52]. This film is a porous-type anodic film, with a barrier layer at the metal/film interface and numerous imperfections [54].…”

Section: Chronoamperometrymentioning

confidence: 99%

Electrochemical Behavior of Al–Al9Co2 Alloys in Sulfuric Acid

Sfikas

Lekatou

2020

CMD

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Al–Co alloys of various Co contents (2–20 wt.% Co) were fabricated by vacuum arc melting (VAM) with the scope to investigate the influence of cobalt on the microstructure and corrosion resistance of Al in 1 M H2SO4. The obtained microstructures were directional, consisting of Al9Co2 platelets (grown to coarse acicular plates as the Co content increased) uniformly dispersed in an Al-matrix. Alloying Al with Co did not decrease the rate of uniform corrosion of Al but it considerably increased its passivation ability. Moreover, all Al–Co alloys displayed lower uniform corrosion rate and notably higher passivation ability than market leading Al-alloys. The underlying mechanisms during anodic polarization in 1 M H2SO4 were identified and correlated with the microstructure. High Co content alloys (7–20 wt.% Co) presented superior passivation ability in 1 M H2SO4 as compared to the low Co content alloys.

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“…The chemical reaction during pore sealing in hot water is expressed in Equation (1) [ 23 , 24 , 25 , 26 ]. Al 2 O 3 + (1 + 2x)H 2 O→2AlOOH·xH 2 O M. Kohda et al [ 21 ] determined the value of x by gravimetry and obtained x = 1–2.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment

et al. 2022

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It is well known that corrosion protection of pure Al is enormously improved by the formation of porous anodic oxide films and by pore sealing treatment. However, the effects of anodizing and pore sealing on corrosion protection for Al alloys are unclear, because the alloying elements included in Al alloys affect the structure of anodic oxide films. In the present study, porous anodic oxide films are formed on pure Al, 1050-, 3003- and 5052-Al alloys, and pore sealing was carried out in boiling water. Changes in the structure and corrosion protection ability of porous anodic oxide films on pure Al and the Al alloys by pore sealing, were examined by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). SEM observation showed that anodic oxide films formed on pure Al have a smooth surface after pore sealing, and that cracks are formed in anodic oxide films on 1050-, 3003- and 5052-aluminum alloys, after pore sealing. Corrosion protection after pore sealing increased with anodizing time on pure Al, but only slightly increased with anodizing time on the Al alloys.

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Role of anodic oxide films in the corrosion of aluminum and its alloys

Cited by 19 publications

References 40 publications

Insight of Salt Spray Corrosion on Mechanical Properties of TA1-Al5052 Self-Piercing Riveted Joint

Insight of Salt Spray Corrosion on Mechanical Properties of TA1-Al5052 Self-Piercing Riveted Joint

Electrochemical Behavior of Al–Al9Co2 Alloys in Sulfuric Acid

Changes in the Structure and Corrosion Protection Ability of Porous Anodic Oxide Films on Pure Al and Al Alloys by Pore Sealing Treatment

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