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Impact of mechanical load characteristics on corrosion fatigue behaviour of aluminium alloys for chassis components

: Bauer, Kathrin

European Federation of Corrosion -EFC-:
Safer world through better corrosion control. EUROCORR 2012, European Corrosion Congress. CD-ROM : September 9 - 13, 2012, Istanbul, Turkey
Istanbul, 2012 (EFC event 330)
1 S.
European Corrosion Congress (EUROCORR) <2012, Istanbul>
Fraunhofer LBF ()
mechanical load characteristic; corrosion fatigue behaviour; aluminium alloy; chassis component; fatigue behavior; aluminium; alloy; CHASSIS

The application of aluminium alloys for safety relevant structural components of vehicles requires a thorough qualification of alloys as well as components. Corrosion and fatigue properties have to be assessed in advance. With the introduction of high strength but possibly less corrosion resistant alloys it is of interest to determine if borderline or unacceptable sensitisation against corrosion comes into effect under simultaneous mechanical and corrosive loading, especially when using common corrosion fatigue qualification procedures developed by the automotive industry. Within this work corrosion fatigue tests under constant and variable amplitude loading were carried out on established aluminium alloys such as EN AW-5042, EN AW-6082, EN AW-6110 A and EN AC-42100 as well as corrosion sensitised alloys: EN AW-5042 with borderline and unacceptable thermal ageing treatment and forged and cast alloys with elevated copper content. Surface conditions and microstructure were set to comply with conditions typical for components currently used. Aforementioned alloys and material conditions were assessed concerning the influence of mechanical loading conditions (frequency, stress ratio, load spectra, load signal type, strain rate) on the damaging process (type of corrosion, electrochemical characteristics) and on corrosion fatigue life. The specific interaction of mechanical loads and sensitisation against corrosion is regarded in respect of the expected differentiability and prerequisites for a differentiation with an improved qualification procedure [1].