A low-foaming, non-ionic surfactant, used to improve the brightness of the coating, the cloud point temperature of 1% aqueous solution is 45C, RALUFONEN16-80 and anionic surfactants such as RALUFONN Chemicalbook APE14-90 or RALUFONEA15-90 as auxiliary Brightener, used in combination in acid galvanizing. Due to the low foaming properties of RALUFONEN 16-80, it is suitable for use in air stirred tanks.