Laser Treatment Method for Improvement of the Corrosion Resistance of Friction Stir Welds

Microstructural characterization and corrosion behavior of multipass friction stir processed AA2219 aluminium alloy

“…Corrosion attack in the nugget has been found for AA2024-T351, AA5456-H116 and AA7010-T7651 alloys [3]. Studies have shown attack to be predominantly in heat affected zone (HAZ), for example in AA2024-T351 [4], AA7075-T651 [5], AA7075-T6 [6] alloys and for the AA7050-T7651 alloy, corrosion occurred in the interface between nugget and thermomechanically affected zone (TMAZ) [7]. Frankel and Xia [8] investigated pitting and stress corrosion cracking behavior of FSWAA5454 alloy and compared them with those of base alloy and gas tungsten arc welded (GTAW) samples.…”

Laser control melting of alumina surfaces with presence of B4C particles

“…They showed that the use of secondary beam reduced the crack networks formed at the laser treated surface. Laser treatment of aluminum alloy surface for corrosion protection was investigated by Williams et al [7]. Their findings revealed that laser treated surface resulted in improved corrosion resistance.…”

Microelectrochemical investigation on aluminium–steel friction welds

“…All these facts prefer the microcapillary cell technique which was developed in the 1990s. [3 -6] This technique is very helpful for investigating the corrosion behaviours of welds as it was recently shown on stainless steel welds, [3] laser beam welds (LBWs) [7] and friction stir welds. [8 -10] It is reported that the corrosion attack strongly depends on the type of the weld.…”