Corrosion of Al 7075 alloy during the production of aeronautic components: Influence of process parameters at the deburring stage

Abstract

Aluminum alloys of the 7XXX series are widely used in aircraft applications. During the manufacturing of aeronautic components, the parts pass through four production phases (milling/drilling, deburring/adjustment, non‐destructive testing, and surface treatment) and come into contact with several kinds of fluids such as degreasing and cleaning solutions, which can lead to the occurence of surface defects due to localized corrosion, then requiring reworking or scrapping. The present study aimed at studying the influence of process parameters in the deburring/adjustment stage on the development of surface defects in 7075 alloy parts. The methodology consisted of design of experiments, immersion and drying tests, and surface analysis for quantification of corrosion damage. The results showed that the degreasing bath concentration and temperature, the immersion time of the aluminum parts in the degreasing solution, and the use of solvent pre‐cleaning had no significant influence on the quantity of surface defects. Therefore, these factors do not need to be rigorously controlled in the process. Clean washing water must be preferred and the parts must be dried in the stove at 110 °C in order to ensure a surface free of defects. The immersion and electrochemical tests showed that the occurrence of surface defects is lower in aged degreasing solution than in recently prepared solution.

Influence of Nickel Powders on Corrosion Resistance of Cold Sprayed Coatings on Al7075 Substrate

“…However, the coating sprayed with dendritic powder exhibited better mechanical properties and significantly lower surface roughness in comparison with the deposit sprayed with spheroidal particles. Aluminum and its alloys (e.g., Al7075) are widely used for the production of light and mechanically tough products, mainly in aviation [28,29]. Unfortunately, these materials easily lose their strength properties as a result of corrosion, chemical, and electrochemical processes.…”

Corrosion Behavior of AA7075-T73 Aluminum Alloy During Machining of Aeronautical Components

“…AA7075 aluminum alloy is a high strength precipitationhardenable alloy used to manufacture aircraft parts such as wings structures and hydraulics components due to its high strength-to-density ratio [1][2][3][4] . The higher mechanical resistance of this alloy is achieved by alloying with elements such as Cu, Zn, Cr, Mg, [1][2][5][6][7] .…”

“…AA7075 aluminum alloy is a high strength precipitationhardenable alloy used to manufacture aircraft parts such as wings structures and hydraulics components due to its high strength-to-density ratio [1][2][3][4] . The higher mechanical resistance of this alloy is achieved by alloying with elements such as Cu, Zn, Cr, Mg, [1][2][5][6][7] . Intermetallic phases containing Fe and Si, such as Al 7 Cu 2 Fe, Al 23 CuFe 4 and Mg 2 Si are commonly found in this alloy as inclusions and may have a deleterious effect on fatigue resistance [8][9] .…”

Development of the local proton concentration during pulse anodizing

“…The anodizing of aluminum is widely used in the industry to, e.g., enhance the corrosion stability and the wear resistance, or get better adhesive bonding of aluminum parts . To reach specific oxide properties, there are several adjustable parameters in the process, for example the composition and the temperature of the electrolyte and the current‐voltage regime.…”

“…The anodizing of aluminum is widely used in the industry to, e.g., enhance the corrosion stability and the wear resistance, or get better adhesive bonding of aluminum parts. [1][2][3][4] To reach specific oxide properties, there are several adjustable parameters in the process, for example the composition and the temperature of the electrolyte and the current-voltage regime. The driving force for the process, the voltage/current, and the correlation to reaction kinetics and resulting oxide morphology were studied intensively in the last decades.…”