Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

Abstract

The high humidity of marine atmosphere and the existence of corrosive chloride ions lead to the premature corrosion failure of aluminum alloy components. The development of surface-strengthening technology provides an opportunity to prolong their service life spans. As a mature surface-strengthening technology, the shot peening process is widely used, owing to its advantages over other strengthening technologies, including its easy operation and high production rate. The shot-peened surface integrity depends on shot peening variables that introduces the thermomechanical effect to the deformed surface layer. When the inappropriate shot peening parameters are adopted, the shot-peened surface integrity could be deteriorated, which further weakens the corrosion performance of the surface. Therefore, it is essential to optimize shot peening process variables with the consideration of the material and its application. In this paper, the strengthening mechanism of the shot peening process was firstly elaborated, and then the effects of process parameters on the surface integrity of aluminum alloy were reviewed. The relationship between the surface integrity and corrosion resistance was also revealed. Two directions, including the application of the surface temperature rise during the shot peening process and the shot-peened surface roughening, are proposed.

Environmentally Benign Grape Seed Oil for Corrosion Inhibition: Cutting-Edge Computational Modeling Techniques Revealing the Intermolecular and Intramolecular Synergistic Inhibition Action

“…By analyzing the K ads values (Table 4), it was concluded that the GSO components had the strongest affinity for adsorbing onto the C38 surface. A higher K ads value indicated a more robust and effective adsorbed layer on the metal surface, resulting in superior surface coverage [50,[53][54][55].…”

“…By analyzing the Kads values (Table 4), it was concluded that the GSO components had the strongest affinity for adsorbing onto the C38 surface. A higher Kads value indicated a more robust and effective adsorbed layer on the metal surface, resulting in superior surface coverage [50,[53][54][55]. The inhibitory effect of natural GSO on steel corrosion at different inhibitor concentrations was investigated over a temperature range of 298 to 328 K. Polarization curves of C38 were obtained in a 1 M HCl medium before and after adding GSO at a concentration of 0.5 g/L, following a 30 min immersion time.…”

Metallurgical aspects of the corrosion resistance of 7000 series aluminum alloys – a review

“…The formation of a passive film on aluminum alloy surfaces is significantly related to the residual stress field. For this reason, the shot-peening method is also promising [137]. Numerous opinions being advanced in the literature indicate that technologies enabling grain refinement to nanometric sizes through strong plastic deformation can improve the corrosion resistance of aluminum alloys [138,139].…”

Corrosion Behavior of Shot-Peened Ti6Al4V Alloy Produced via Pressure-Assisted Sintering

“…Thus far, some contradicting results have been reported regarding the corrosion behavior of shot-peened Ti6Al4V alloys. While some claim that the peening process increases corrosion resistance as a result of the modified surface structure [24,25], others assert the opposite [26]. According to Zhang et al [15], proper ultrasonic shot-peening (USSP) treatment improves the corrosion resistance of a selective laser-melted Ti6Al4V alloy in aqueous 3.5% NaCl medium, attributed to the increased microstructural defects (e.g., dislocation density) due to USSP, promoting passive film formation on the peened surface.…”