Here Raman microscopy and electro probe technique were used to identify the corrosion products and their locations on and within of ancient Yuan Dynasty bronze mirror from Lufeng of Yunnan province.

Analysis is made on the dark lines defects occurring over the working surface of flange by measurement with the optical microscope, Scanning electro microscope (SEM) and electronic probe.

In addition to the positioned thickness measurement, the electro-chemical measurement, resistance probe and inductance probe techniques were also the effective methods in corrosion monitoring.