METHOD FOR SURFACE TREATMENT OF MAGNESIUM ALLOY PLATE, AND MAGNESIUM ALLOY PLATE

摘要

Disclosed is a method for surface treatment of a magnesium alloy plate, said method being able to cause blemishes and discoloration to not be prominent on the plate surface in the case where wet polishing has been performed to smooth the surface of the Mg alloy plate. Further disclosed is an Mg alloy plate produced by means of this method for surface treatment. The method for surface treatment of an Mg alloy plate is provided with a polishing step (1), a cleaning step (2), an excess-liquid-removing step (3), and a drying step (4), each step being performed in line. In the polishing step (1), the surface of a conveyed Mg alloy plate (W) is polished by a polishing belt (1A) (polishing material) while using a polishing liquid (13). In the cleaning step (2), after the polishing step (1), the polishing liquid (13) adhered to Mg alloy plate is washed away with a cleaning liquid (21). In the excess-liquid-removing step (3), the cleaning liquid (21) that adhered to the Mg alloy plate (W) in the cleaning step (2) is eliminated. In the drying step (4), the cleaning liquid (21) that was not eliminated in the excess-liquid-removing step (3) and that remains on the surface of the Mg alloy plate (W) is dried. Furthermore, in the polishing step (1), the surface roughness of the Mg alloy plate (W) is caused to be, for example, an arithmetic average roughness (Ra) that satisfies Ra = 1.2 µm.