Long-term atmospheric pre-corrosion fatigue properties of epoxy primer-coated 7075-T6 aluminum alloy structures

Zhang, Sheng; Zhang, Teng; He, Yuting; Du, Xueyan; Ma, Binlin; Zhang, Tianyu

doi:10.1016/j.ijfatigue.2019.105225

Cited by 27 publications

(16 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7075-T6 aluminum is widely used in automobiles, aerospace, and other fields due to its low density, high processability, high specific elastic modulus, and high specific strength [1][2][3]. Aluminum is an excellent structure material, but its surface performance is not very well, whose wear-resistance needs to be improved for broader industry applications [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Two-Dimensional Ultrasonic Surface Burnishing Process on 7075-T6 Aluminum

Zhou

Zheng

Ding

et al. 2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

A novel two-dimensional ultrasonic surface burnishing process (2D-USBP) is proposed. 7075-T6 aluminum samples are processed by a custom-designed 2D-USBP setup. Parameter optimization of 2D-USBP is conducted to determine the best processing strategy of 7075-T6 aluminum. A uniform design method is utilized to optimize the 2D-USBP process. U13(133) and U7(72) tables are established to conduct parameter optimization. Burnishing depth, spindle speed, and feed rate are taken as the control parameters. The surface roughness and Vickers hardness are taken as the evaluation indicators. It establishes the active control models for surface quality. Dry wear tests are conducted to compare the wear-resistance of the 2D-USBP treated sample and the original sample. Results show that the machining quality of 2D-USBP is best under 0.24 mm burnishing depth, 5000 r/min spindle speed, and 25 mm/min feed rate. The surface roughness Sa of the sample is reduced from 2517.758 to 50.878 nm, and the hardness of the sample surface is improved from 167 to 252 HV. Under the lower load, the wear mechanism of the 2D-USBP treated sample is mainly abrasive wear accompanied by delamination wear, while the wear mechanism of the original sample is mainly delamination wear. Under the higher load, the accumulation of frictional heat on the sample surface transforms the wear mechanisms of the original and the 2D-USBP treated samples into thermal wear.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of Two-Dimensional Ultrasonic Surface Burnishing Process on 7075-T6 Aluminum

Zhou

Zheng

Ding

et al. 2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Aluminum alloys, with low density and high strength, are one of the most important lightweight structural materials in aircraft and spacecraft manufacturing. [1][2][3] Intermetallic particles are formed by thermomechanical processing to enhance the mechanical properties of aluminum alloys. However, these intermetallic particles have adverse effects on the formation of the protective oxide film and they can contribute to induce microscale galvanic corrosion, resulting in severe pitting corrosion or intergranular corrosion.…”

Section: Introductionmentioning

confidence: 99%

The effect of nitrate on the corrosion behavior of 7075‐T651 aluminum alloy in the acidic NaCl solution

Liu

et al. 2021

Materials & Corrosion

View full text Add to dashboard Cite

The effect of nitrate on the corrosion behavior of 7075-T651 aluminum alloy in an acidic NaCl solution is investigated by electrochemical investigation and morphology characterization. Localized corrosion initiated from intermetallic particles could be observed in the solution with and without NaNO 3 . The nitrate plays a controversial role in the corrosion of 7075-T651 aluminum alloy. It could enhance the performance of passive film and reduce the probability of pitting corrosion initiation. However, the pitting corrosion would be promoted by nitrate, once stable pitting corrosion is initiated.

show abstract

“…To prevent damage to the aluminum alloys used in aircraft structures due to corrosion, a double-layer protection system consisting of epoxy primers along with an anodized film of sulfuric acid has been used as a protection measure [1,2]. Because aircraft are on the ground for most of the time, the main corrosive environment for them is the ground atmosphere, where the coastal atmosphere has the most significant impact on the safety of the structure of aircraft [3][4][5][6]. Qiao et al [7] investigated the corrosion kinetics and patina (corrosion products) layer evolution of galvanized steel submitted to wet/dry cyclic corrosion tests in a simulated coastal-industrial atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Atmospheric Aging and Corrosion of Epoxy Primer-Coated Aluminum Alloy in Coastal Environments

Zhang

et al. 2021

Coatings

Self Cite

View full text Add to dashboard Cite

Aircraft are subjected to extreme weather conditions in coastal areas. This study reports long-term atmospheric exposure tests carried out on an epoxy primer-coated aluminum alloy in a coastal environment for 7, 12, and 20 years. The micromorphology and characteristics of the section and surface, the products of corrosion, electrochemical impedance, and molecular structure of the coated specimens were examined through a spectrophotometer, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectrometer (XPS). The results showed that the angles of contact of the specimens with different numbers of years of atmospheric exposure satisfied the normal distribution. Their fractal dimensions increased with an increase in the duration of exposure. Intergranular corrosion and exfoliation corrosion appeared in the specimens after 20 years, where the product of corrosion was Al(OH)3. The impedances and thermal properties of the epoxy coatings were influenced by the synergistic effects of aging and post-curing. The impedances of the coatings decreased greatly after long-term atmospheric exposure. After 20 years of corrosion, the specimen showed the characteristics of the substrate being corroded. The mechanism of corrosion and the electrochemical equivalent circuit were also analyzed.

show abstract

Long-term atmospheric pre-corrosion fatigue properties of epoxy primer-coated 7075-T6 aluminum alloy structures

Cited by 27 publications

References 19 publications

Investigation of Two-Dimensional Ultrasonic Surface Burnishing Process on 7075-T6 Aluminum

Investigation of Two-Dimensional Ultrasonic Surface Burnishing Process on 7075-T6 Aluminum

The effect of nitrate on the corrosion behavior of 7075‐T651 aluminum alloy in the acidic NaCl solution

Long-Term Atmospheric Aging and Corrosion of Epoxy Primer-Coated Aluminum Alloy in Coastal Environments

Contact Info

Product

Resources

About