Excimer laser surface glazing was performed on a magnesium ZK60/SiC composite with an aim to improve its corrosion resistance. The effects of the laser processing parameters, namely, the laser scanning velocity, the laser energy intensity and the type of shielding gas, on the corrosion resistance of the composite have been studied. The surface morphology and the chemical state of the composite before and after laser treatment were examined. The results show that decreasing the scanning velocity and/or increasing the laser energy intensity would reduce the number of SiC particles on the surface of the composite. This was partly due to decomposition of SiC during laser irradiation and was supported by the results of the XPS analysis. The improved corrosion resistance of the laser-treated samples is believed to be primarily due to a reduction of the cathodic sites (i.e. SiC particles) on the surface. In the range of the scanning velocity used, the N2-treated samples show a much higher corrosion resistance than that of the air-treated and the Ar-treated samples.
|Number of pages||12|
|Journal||Lasers in Engineering|
|Publication status||Published - 1 Jan 1999|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering