Method for controlling surface quality of zinc-aluminum-magnesium strip steel with thick specification and thick plating layer

• Main Authors: SHAO YANZE, TAN WENZHEN, ZHANG BIN, WANG YANFENG, JI MINGLONG, HAN BING, LI JIANYING, JIANG JIAWEI, CHI YONGQING
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for controlling the surface quality of zinc-aluminum-magnesium strip steel with a thick specification and a thick plating layer, and belongs to the technical field of metallurgy. The method comprises the following steps: adjusting the in-pot temperature of strip steel according to the thickness of the strip steel, and adjusting the distance between an air knife lip and the strip steel and the pressure of an air knife according to the thickness of the strip steel, wherein the thickness of the strip steel ranges from 1.8 mm to 3.0 mm, the thicknesses of the two sides of a plating layer are greater than or equal to 275 g/m , and the temperature of a plating solution in the hot dipping procedure ranges from 470 DEG C to 495 DEG C. According to the method, a set of process parameters suitable for producing different thickness specifications and plating layer thicknesses are explored through the incidence relation among the air knife process of the zinc-aluminum-magnesium production