Investigation on anodized 5052 aluminum alloy and its corrosion resistance in simulated acid rain

Gu, Junming; Zhang, Xinying; Yu, Liying

doi:10.1016/j.ijoes.2023.100336

Cited by 8 publications

(1 citation statement)

References 42 publications

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“…Currently, various sealing solutions have been developed to enhance the corrosion resistance of the alloy and simultaneously achieve surfaces with new or optimized performances, such as hydrophobicity and ice resistance, thereby expanding their field of applications [28,[46][47][48][49]. The corrosion resistance of anodized aluminum alloys in different environments has been extensively studied, including acidic and neutral solutions [50][51][52][53][54]. However, the behavior of anodized aluminum alloys in alkaline media is a topic that requires further investigation.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Fabris,

Masi,

Bignozzi

2024

Coatings

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Aluminum alloys are extensively used to manufacture mechanical components. However, when exposed to alkaline environments, like lubricants, refrigerants, or detergents, they can be corroded, reducing their durability. For this reason, the aim of this study is to investigate the influence of aggressive alkaline solutions (i.e., pH and presence of chlorides) on the corrosion resistance of three aluminum alloys (AA 5083-H111, AA 6082-T6, and AA 7075-T6) with and without anodizing treatments. Open circuit potential (EOCP) and anodic polarization measurements were carried out and typical corrosion parameters such as corrosion current density (icor) and corrosion rate (CR) were determined. Morphology of the corrosion attack and samples microstructure were investigated by scanning electron microscope. Results show that corrosion behavior of the three investigated alloys is influenced by (i) the aggressiveness of the testing environments; (ii) the thickness of the anodizing treatment; (iii) the alloy chemical composition; (iv) the distribution of intermetallic phases in the aluminum matrix. Moreover, three galvanic series have been built also testing other metallic alloys commonly used in mechanical applications, i.e., carbon steel (C40), stainless-steel (AISI 304), and Cu-based alloys (Cu-Ni alloy and CW 617 N, respectively). Results clearly indicate that galvanic series play a fundamental role when it is necessary to select an alloy for a specific environment, highlighting the thermodynamic conditions for corrosion occurrence. On the other hand, kinetic measurements and microstructural studies carried out on the three aluminum alloys stress the importance of the surface treatments and relevant thickness as well as the effect of metal exposure. Future work will involve the study of other surface treatments on aluminum alloys and the evaluation of their corrosion behavior in acidic environments.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Fabris,

Masi,

Bignozzi

2024

Coatings

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Insight into the crevice corrosion mechanism of AA7075‐T651 high‐strength aluminum alloys in neutral nitrate solution: The effect of Cl⁻

Li,

Tang,

Liu

et al. 2024

Materials & Corrosion

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The crevice corrosion behavior and mechanism of AA7075‐T651 aluminum alloy was investigated by electrochemical measurements and surface analysis technologies in a neutral nitrate solution with different contents of NaCl. The Cl− was identified as crucial for the initiation and development of the crevice corrosion, with the phenomenon absent in the 0.05 M NaCl solution but initiated in the 0.5 and 1 M NaCl solutions. However, the crevice corrosion was more pronounced in the 0.5 M NaCl solution due to the establishment of a larger galvanic corrosion effect. The rapid dissolution of the anodic phase resulted in the increased Cl− inside the crevice, while the cathodic phase enhanced the localized dissolution through micro‐galvanic corrosion. This synergistic effect significantly facilitated the development of crevice corrosion.

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Effect of Step potential on the Structure and Properties of Ceramic Coating on the Surface of 2024 Aluminum Alloy thin Sheets

Yang,

Wang,

Fan

et al. 2024

Ceramics International

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Investigation on anodized 5052 aluminum alloy and its corrosion resistance in simulated acid rain

Cited by 8 publications

References 42 publications

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Insight into the crevice corrosion mechanism of AA7075‐T651 high‐strength aluminum alloys in neutral nitrate solution: The effect of Cl⁻

Effect of Step potential on the Structure and Properties of Ceramic Coating on the Surface of 2024 Aluminum Alloy thin Sheets

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Investigation on anodized 5052 aluminum alloy and its corrosion resistance in simulated acid rain

Cited by 8 publications

References 42 publications

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

Insight into the crevice corrosion mechanism of AA7075‐T651 high‐strength aluminum alloys in neutral nitrate solution: The effect of Cl−

Effect of Step potential on the Structure and Properties of Ceramic Coating on the Surface of 2024 Aluminum Alloy thin Sheets

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Product

Resources

About

Insight into the crevice corrosion mechanism of AA7075‐T651 high‐strength aluminum alloys in neutral nitrate solution: The effect of Cl⁻