Impact of Marine Atmospheric Corrosion on the Microstructure and Tensile Properties of 7075 High-Strength Aluminum Alloy

Abstract

This study aimed to investigate the impact of corrosion on the microstructure and tensile properties of 7075 high-strength alloy. It involved outdoor exposure tests in an actual marine atmospheric environment in Wanning, Hainan Province. The results showed that the 7075 alloy was corroded rapidly in the marine atmospheric environment, and corrosion pits and intergranular cracks were generated. The intergranular cracks were extended along the grain boundary during corrosion, leading to the exfoliation of the matrix. The cause for the intergranular corrosion was discussed based on the microstructure characteristics of 7075 alloy. The tensile properties of the 7075 alloy gradually deteriorated with the increase of exposure time in the marine atmospheric environment. The ultimate strength and elongation were decreased by about 3.2% and 58.3%, respectively, after 12 months of outdoor exposure.

Laser Shock Peening Improves the Corrosion Resistance of an E690 High-Strength Steel Cladding Layer

“…In summary, after laser shock peening, the corrosion potential of the sample increased and the corrosion current density decreased, indicating weakened anodic dissolution performance and enhanced corrosion resistance. Compared with the other literature [21][22][23], the corrosion current density of the cladding layer decreased more significantly after laser shock peening in this experiment, with the corrosion current density increasing from 114.5 μA/cm 2 and then dropping to 5.41 μA/cm 2 , with a significantly reduced corrosion rate and improved corrosion resistance. 8).…”

Metallic and Ceramic Materials Integrity—Surface Engineering for Wear, Corrosion and Erosion Prevention

“…Wang et al [23] researched the effect of grain size on the tribological behavior of the CoCr-FeMnNi high-entropy alloy. Xiang et al [24] studied the impact of marine atmospheric corrosion on the microstructure and tensile properties of a 7075 high-strength aluminum alloy. Yang et al [25] researched the corrosion and mechanical behavior of the as-cast and solid-solution-treated AM50 magnesium alloy in different media.…”