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Method for eliminating galvanization defects caused by micron-order substrate damage

A micron-level, substrate-based technology, applied in hot-dip plating process, coating, workpiece surface treatment equipment, etc., can solve problems such as surface defects

Inactive Publication Date: 2019-08-06
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The defects mentioned in the patent are caused by CSP hot-rolled iron oxide scale, and the residual iron oxide scale after galvanizing causes surface defects

Method used

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  • Method for eliminating galvanization defects caused by micron-order substrate damage
  • Method for eliminating galvanization defects caused by micron-order substrate damage
  • Method for eliminating galvanization defects caused by micron-order substrate damage

Examples

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Embodiment

[0039] After hot rolling, pickling and cold rolling, the steel coil enters the annealing furnace and zinc pot to produce high surface quality hot-dip galvanized outer panels. Hot rolling and pickling process parameters are shown in Tables 1 and 2. The morphology of iron oxide scale and substrate micro-area was observed and counted by scanning electron microscope.

[0040] Example Form Table 1

[0041]

[0042]

[0043] Example Form Table 2

[0044]

[0045] As shown in Examples 1-6 of Tables 1 and 2, in the hot rolling and pickling process parameters defined in the present invention, low-temperature slab heating is adopted, and the temperature is controlled at 1150 to 1250°C; the phosphorus removal capacity of finish rolling FI is increased, and the system The outlet pressure of the water pump is 20-30MPa; the thickness of the oxide scale of the hot-rolled incoming material is controlled at 5-10μm; the pickling speed of the three-stage pickling tank and the steady-s...

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Abstract

The invention discloses a method for eliminating galvanization defects caused by micron-order substrate damage. When an automobile outer plate with a high-level surface is produced, the processes of hot rolling and acid pickling are optimized, and the occurrence frequency of the defect of dense bright spots of the galvanized outer plate is effectively reduced. A hot-rolled plate blank is adopted for low-temperature heating, the temperature ranges from 1150 DEG C to 1250 DEG C, F1 is added for removing phosphorus water, and the coiling temperature adopts low limiting control to range from 700 DEG C to 780 DEG C. Homeostatic control of the acid pickling is adopted, and the speed is controlled to range from 60 m / min to 180 m / min; the temperature of a first-stage acid tank ranges from 70 DEG Cto 90 DEG C, and the temperature of a second-stage acid tank and the temperature of a third-stage acid tank are not lower than 70 DEG C; and the HCl concentration of first-stage acid liquid ranges from 50 g / l to 100 g / l, and the HCl concentrations of second-stage acid liquid and the HCl concentrations of third-stage acid liquid range from 160 g / l to 250 g / l.

Description

technical field [0001] The invention relates to the field of hot-dip galvanizing, in particular to a production method for eliminating galvanizing defects caused by micron-level substrate damage. Background technique [0002] With the application of comprehensive control technology, the surface quality of galvanized sheet has been substantially improved. However, since the surface layer of the galvanized sheet cannot hide any tiny substrate defects, even when the zinc liquid reacts with the substrate, it may amplify most of the defects that are invisible to the naked eye under cold rolling conditions. Even in the most advanced continuous hot-dip galvanizing production line, various galvanizing defects such as pitting, bright spots, black spots, missed plating, delamination, scratches, scars, stamping cracks, etc. will still appear during production and use. These defects are classified by source, including processes such as steelmaking, hot rolling, cold rolling, galvanizin...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23G3/02C23G1/08B21B37/74B21B45/08
CPCB21B37/74B21B45/08C23C2/06C23G1/08C23G3/021
Inventor 方芳陈一鸣颜飞杜小峰张伟浩
Owner 武汉钢铁有限公司
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