Degradation of the surface luster of a hot-dip Zn--Al--Mg plated steel sheet is inhibited by controlling the contact temperature between the plating layer and a water stream in a water cooling step after plating layer solidification, thereby suitably controlling the strip temperature during contact with the water stream, and further by incorporating a small amount of a suitable readily oxidizing element in the plating bath to stabilize the oxidation state of the plating surface layer Al and Mg.

La degradación del lustre superficial del caliente-sumerge el zn -- al -- magnesio que la hoja de acero plateada es inhibida controlando la temperatura del contacto entre la capa de la galjanoplastia y una corriente del agua en un paso el refrescarse de agua después de la solidificación de la capa de la galjanoplastia, controlando de tal modo convenientemente la temperatura de la tira durante contacto con la corriente del agua, y más futuro incorporando una cantidad pequeña de un elemento fácilmente que oxida conveniente en el baño de la galjanoplastia para estabilizar el estado de la oxidación del al de la capa superficial de galjanoplastia y del magnesio.

 
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