| 摘要 |
PURPOSE: A method is provided which promptly and accurately weighs organic additives, particularly measures a concentration of polyethylene glycol in a chloride based electrogalvanizing solution so as to obtain an electrogalvanized steel sheet with uniformed external appearance and a plating layer having superior physical properties. CONSTITUTION: The method for weighing organic additives in a chloride based electrogalvanizing solution comprises the step of measuring an absorbency of the extracted organic layer after color forming the chloride based electrogalvanizing solution containing organic additives with a color former and extracting the color formed organic layer with an organic solvent, wherein the organic additives contain a principal constituent of polyethylene glycol, the color former is a mixed solution of ferric chloride and thiocyanates, and the organic solvent is 2-ethylene dichloride, contents of the ferric chloride and thiocyanates in the mixed solution of ferric chloride and thiocyanates are respectively 0.5 to 3.0 moles and 0.05 to 1.0 mole for the ferric chloride, and the thiocyanates are salts of potassium, ammonium, sodium, calcium, lithium, magnesium, aluminum or barium.
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