Effects of pH and chloride concentration on pitting corrosion of AA6061 aluminum alloy

Zaid, B.; Saïdi, D.; Benzaı̈d, A.; Hadji, S.

doi:10.1016/j.corsci.2008.03.006

Cited by 312 publications

(146 citation statements)

References 30 publications

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“…4, it was showed that the reverse anodic curve was shifted to higher currents than the forward curve (positive hysteresis), indicating pitting expected. 32 This can be seen from the specimen appearance after the cyclic polarization measurements, as that observed in Fig. 9.…”

Section: Cyclic Polarization Measurementssupporting

confidence: 65%

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Study on the Temperature Dependence of Pitting Behaviour of AISI 4135 Steel in Marine Splash Zone

et al. 2015

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The corrosive condition at marine splash zone is detrimental to steel structures of offshore applications. The corrosion at splash zone is the most serious not only for uniformed corrosion but also localized corrosion. Practically, marine structures experience cyclic seasonal temperature change. Temperature acts as an important factor affecting corrosion process. In this paper, the effects of temperature on pitting behavior of a low alloy high strength steel (AISI 4135) in marine splash zone have been investigated using electrochemical techniques and morphology observations. The area of hysteresis loop was greater under seawater film at lower temperatures than that at high temperatures, indicating that the pitting corrosion sensitivity is high at lower temperature. AISI 4135 steel has the potential danger of pitting corrosion in marine splash zone after long exposure.

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Section: Cyclic Polarization Measurementssupporting

confidence: 65%

“…32 When the temperature was low, such as 0°C and 10°C in Fig. 4, it was showed that the reverse anodic curve was shifted to higher currents than the forward curve (positive hysteresis), indicating pitting expected.…”

Section: Cyclic Polarization Measurementsmentioning

confidence: 99%

Study on the Temperature Dependence of Pitting Behaviour of AISI 4135 Steel in Marine Splash Zone

et al. 2015

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“…In addition, in accord with Smialowska [2], the first two steps are dependent upon the composition and structure of the oxide film, including the material composition, the presence and distribution of micro-defects, such as vacancies and voids, macro-defects, such as inclusions and second phase particles and so on. Recent studies on pitting corrosion of aluminum and its alloys have been carried out under the consideration of the pitting process described above [3][4][5][6]. The role of various additive anion species on pitting corrosion of aluminum has also been examined [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The effects of film thickness and incorporated anions on pitting corrosion of aluminum with barrier-type oxide films formed in neutral borate and phosphate electrolytes

Habazaki

Nishimura

Okitsu

et al. 2013

J Solid State Electrochem

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The pitting corrosion behavior of high purity aluminum covered with barrier-type anodic films, which are formed in neutral borate and phosphate electrolytes, has been examined in 0.5 mol dm -3 NaCl solution at an applied potential of -0.6 V vs Ag/AgCl, which is slightly nobler than the pitting potential of -0.64 V in the same solution. The pitting current density, i p , increased with time after an incubation time, t i . The double logarithmic plot of i p and polarization time, t, reveals two straight lines, which are separated at the time, . The slope becomes larger after  for the specimens anodized in the phosphate electrolyte, while it becomes smaller for those in the borate electrolyte.Both the t i and τ increase with the thickness of the anodic films, and at the similar film thickness they are much larger for the anodic films formed in the phosphate electrolyte than for those in the borate electrolyte. The corrosion process can be divided into three stages; the incubation period up to t i , the pit nucleation period before  and the pit growth period after . We have discussed the different pitting corrosion behavior of the aluminum specimens covered with the anodic films formed in the borate and phosphate electrolytes in terms of ion selectivity of the anodic films.

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“…Pitting corrosion is a localized form of corrosion producing small bites in a metal. Corrosion by pitting in aluminium alloys is a very complex process that can be affected by various factors such as the type of aggressive ion and its concentration, type of intermetallics formed, and the electrochemical activity associated with these intermetallics [6][7][8]. Since it is an electrochemical corrosion, the corrosion potential is defined as the potential at which the anodic and cathodic current densities * corresponding author; e-mail: beatriz@uhu.es are the same (point of interception between the anodic and cathodic branch in the polarization curves).…”

Section: Introductionmentioning

confidence: 99%

Effect of Copper Addition on Pitting Corrosion of MA-Al

et al. 2016

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This paper is intended to highlight the effect of copper addition on the pitting corrosion resistance of aluminium-base powder metallurgy parts. Results obtained on these mechanically alloyed (MA) specimens are compared with parts of MA-Al without added copper, as well as with commercial aluminium alloys. Immersion tests from 2 to 96 hours in 3.5% NaCl solutions, and potentiostatic techniques, were used to study the pitting corrosion. It was concluded that copper addition, in a similar way that in commercial aluminium alloys, produces a negative effect on the pitting corrosion resistance, because of the formation of Al2Cu. These precipitates produce galvanic cells that favour the specimen pit. Therefore, increasing the copper content of MA-Al, although improving their ductility, worsens the pitting corrosion resistance of these alloys.

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Effects of pH and chloride concentration on pitting corrosion of AA6061 aluminum alloy

Cited by 312 publications

References 30 publications

Study on the Temperature Dependence of Pitting Behaviour of AISI 4135 Steel in Marine Splash Zone

Study on the Temperature Dependence of Pitting Behaviour of AISI 4135 Steel in Marine Splash Zone

The effects of film thickness and incorporated anions on pitting corrosion of aluminum with barrier-type oxide films formed in neutral borate and phosphate electrolytes

Effect of Copper Addition on Pitting Corrosion of MA-Al

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