Corrosion protection of AA7449-T7951 friction stir welds by laser surface melting with an Excimer laser |
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| Authors: | Cristiano Padovani Alison J Davenport Brian J Connolly Stewart W Williams Eirian Siggs Amela Groso Marco Stampanoni |
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| Affiliation: | aUniversity of Birmingham, Metallurgy and Materials, Birmingham, UK;bCranfield University, Welding Engineering Research Centre, Cranfield, UK;cBAE SYSTEMS, ATC Centre, Sowerby, UK;dSwiss Light Source, Paul Scherrer Institut, Villigen PSI, Switzerland |
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| Abstract: | The corrosion protection afforded by laser surface melting (LSM) AA7449-T7951 friction stir welds was investigated. LSM produced melting of the constituent particles and formation of a homogeneous 3–5 μm thick layer. Electrochemical tests showed a reduction in cathodic reactivity after LSM. The breakdown potentials, however, did not change significantly, indicating an anodically reactive surface. In situ and ex situ observation after immersion in 0.1 M NaCl showed that LSM reduced the depth attack in the weld region (particularly the HAZ), affording sacrificial protection to the substrate. Delamination of the treatment can occur during corrosion propagation. |
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| Keywords: | A Aluminium C Welding |
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