Abstract：The zinc coating mass of electro-galvanized steel sheet and hot-galvanized steel sheet were measured according to the GB/T 1839-2008, which is gravimetric method. The zinc coating mass of the electro-galvanized steel and hot-galvanized steel was determined by glow discharge optical emission spectroscopy (GDOES). And the coating structure of both galvanized steel sheet before and after dissolution was also characterized by GDOES. It was found that the structures of hot-galvanized steel and electro-galvanized steel were slightly different. And the coating of galvanized steel sheet could be dissolved by gravimetric method, to coating included pure zinc coating,zinc and iron junction layer and zinc permeated in steel matrix totally dissolved. Furthermore, the result showed excellent uniformity which existed between gravimetric method and glow discharge optical emission spectrometry when determining the zinc coating mass of both sheets. This further demonstrated that gravimetric method was relatively accurate for determining zinc coating mass in different types of galvanized steel sheet. Besides, the error source and size of zinc coating mass of both sheet by gravimetric method were discussed according to the results of GDOES and the content of iron and aluminum in zinc coating by inductively coupled plasma atomic emission spectrometry(ICP-AES).Research found that the error of zinc coating mass among different galvanized sheet by gravimetric method was mainly caused by the dissolution of iron and aluminum in the coating in addition to zinc. The error of electro-galvanized steel sheet was far more less than that in hot-dip galvanized steel sheet when both were determined by gravimetric method. This indicated gravimetric method was more suitable for determining zinc coating mass of electro-galvanized steel sheet.
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