Abstract
Schematic representation of the experimental procedure. ▪
•The fabrication of an extrudate of AM30 magnesium alloy has been carried out.•Effects of the location of extrusion welding on the corrosion behavior was studied.•The corrosion of the extrudate after varied exposure periods of time was reported.•The corrosion resistance of AM30 extrudate increases with prolonging exposure time.•The intensity of corrosion varies with changing the location of the extrusion welding.
The effect of extrusion welding at three different locations on the corrosion of a magnesium alloy (AM30) extrudate after being immersed in 3.5% NaCl solutions for 1h, 12h, and 24h has been investigated. Different electrochemical methods namely, cyclic polarization, open-circuit potential, electrochemical impedance spectroscopy, and current–time measurements were employed. The corroded surfaces were characterized using various spectroscopic analyses. All electrochemical measurements confirmed that the corrosion of the Mg alloy extrudate changes depending on the location of the extrusion welding, which affects the values of the obtained corrosion current, corrosion rate, and corrosion resistance. The severity of corrosion was found to decrease with prolonging the exposure periods of time in the chloride solutions for all taken samples at the different locations of the extrusion welding. This was further confirmed by the scanning electron microscopy micrographs and the energy dispersive X-ray profiles taken for the corroded surfaces of the different extruded AM30 samples.