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Investigation on the Protective Role of Local Al Cladding against Corrosion Damage and Hydrogen Embritlement of 2024 Al alloy Specimens

Research Area: Corrosion Year: 2005
Type of Publication: Article Keywords: Corrosion; Hydrogen embrittlement; Tensile properties degradation; 2024 Al clad; Damage protection; Local surface cladding
Authors:
Abstract:
The present investigation aims to inquire whether Al cladding of 2024 aluminum alloy specimens could provide, additionally to the expected protection against corrosion damage, also a protection against the corrosion induced hydrogen embrittlement of the alloy. The latter is observed when bare 2024 material is subjected to laboratory exfoliation corrosion exposure also in the absence of mechanical loading. Furthermore, the study aims to ponder on the question whether local Al cladding at small regions of the specimen surface might suffice for protecting the specimen against corrosion damage and hydrogen embrittlement. The work comprises the results of an extensive experimental investigation including tensile tests on precorroded 2024 specimen protected through both complete and local surface Al cladding. Metallographie and fractographic analyses as well as measurements of the hydrogen uptake during the corrosion process.
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