A NEW METHOD TO INVESTIGATE LOCALIZED CORROSION ON 2024, 7075 AND 6061 ALUMINIUM ALLOYS IN THE SEA-LIKE ATMOSPHERE ENVIRONMENTS

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AZIMI ABARGHOUI S.S.; SAATCHI A.; EBRAHIMI KAHRIZSANGI R.

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Journal: JOURNAL OF NEW MATERIALS Year:2013 | Volume:4 | Issue:1 (13) Page(s): 69-81

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Title

A NEW METHOD TO INVESTIGATE LOCALIZED CORROSION ON 2024, 7075 AND 6061 ALUMINIUM ALLOYS IN THE SEA-LIKE ATMOSPHERE ENVIRONMENTS

Author(s)

AZIMI ABARGHOUI S.S. | SAATCHI A. | EBRAHIMI KAHRIZSANGI R. | Issue Writer Certificate

Keywords

ALUMINIUM ALLOYSQ2

MARINE ATMOSPHERIC CORROSIONQ3

INTERMETALLIC COMPOUNDSQ2

INTERGRANULAR CORROSIONQ2

EXFOLIATION CORROSIONQ3

Abstract

Adding some alloying elements such as copper and zinc into aluminium and appling precipitation hardening process, makes these alloys sensitive to different types of corrosion in marine atmospheric environments. Precipitates on the matrix and grain boundaries are the main factor for corrosion. In order to study the corrosion behavior of metals in marine atmospheric environments, simulated environmental conditions is required to provide severe atmospheric environments containing chloride ion. In this research, a new method is used to study the atmospheric corrosion. At first specially prepared samples were tasted in corrosion cells with different time periods that the salt crystals were placed on the surface of samples and end grain areas on sample thickness were investigated. In this situation 100% relative humidity condition was stable. The microscopic studies showed that the INTERGRANULAR CORROSION happened less than 72 hours in 7075 alloy because of presence of deposits in grain boundaries and after this time, INTERGRANULAR CORROSION transform to pitting and EXFOLIATION CORROSION. Uniform corrosion with small pits was stable for 2024 alloy and the corrosion rate for 6061 alloy was lower than 2024 and 7075 alloys. Finally In order to compare the corrosion behavior of surface, the alloys were placed into the salt spray test for 672 hours according to ASTM B117. In this situation, 2024 alloy had the highest rate of corrosion.

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References

ANODIZING OF 2024- T3 ALUMINUM ALLOY IN MIXED- ELECTROLYTE OF SULFURIC, BORIC AND PHOSPHORIC ACIDS AND DETERMINATION OF THE OXIDE LAYER THICKNESS AND INVESTIGATION OF CORROSION BEHAVIOR BY USING ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY TECHNIQUE.

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APA: Copy

AZIMI ABARGHOUI, S.S., SAATCHI, A., & EBRAHIMI KAHRIZSANGI, R.. (2013). A NEW METHOD TO INVESTIGATE LOCALIZED CORROSION ON 2024, 7075 AND 6061 ALUMINIUM ALLOYS IN THE SEA-LIKE ATMOSPHERE ENVIRONMENTS. JOURNAL OF NEW MATERIALS, 4(1 (13)), 69-81. SID. https://sid.ir/paper/169741/en

Vancouver: Copy

AZIMI ABARGHOUI S.S., SAATCHI A., EBRAHIMI KAHRIZSANGI R.. A NEW METHOD TO INVESTIGATE LOCALIZED CORROSION ON 2024, 7075 AND 6061 ALUMINIUM ALLOYS IN THE SEA-LIKE ATMOSPHERE ENVIRONMENTS. JOURNAL OF NEW MATERIALS[Internet]. 2013;4(1 (13)):69-81. Available from: https://sid.ir/paper/169741/en

IEEE: Copy

S.S. AZIMI ABARGHOUI, A. SAATCHI, and R. EBRAHIMI KAHRIZSANGI, “A NEW METHOD TO INVESTIGATE LOCALIZED CORROSION ON 2024, 7075 AND 6061 ALUMINIUM ALLOYS IN THE SEA-LIKE ATMOSPHERE ENVIRONMENTS,” JOURNAL OF NEW MATERIALS, vol. 4, no. 1 (13), pp. 69–81, 2013, [Online]. Available: https://sid.ir/paper/169741/en

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