Method for testing porosity of surface oxide iron sheet of hot-rolled steel plate
A technology for hot-rolled steel sheet and surface oxidation, which is applied in the fields of permeability/surface area analysis, measurement device, suspension and porous material analysis, etc. Simple operation, timely and accurate information
Inactive Publication Date: 2019-01-01
SHOUGANG CORPORATION
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Problems solved by technology
The present invention is to solve the current bottleneck problem of being unable to quickly evaluate the compactness of oxide scale on the surface of hot-rolled steel sheets
Method used
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Embodiment
[0026] In the embodiment of the present invention, the electrochemical impedance curve of the hot-rolled steel sheet with and without scale is electrochemically tested, and the porosity is calculated by fitting the polarization resistance value, which specifically includes the following steps:
[0027] Step 1: Process the hot-rolled steel plate into two samples of 10mm×10mm×4mm, and remove the iron scale on the surface of one of them completely with sandpaper. Sandblasting the surface, degreasing with acetone, cleaning with alcohol, and drying for later use.
[0028] Step 2: Use sandpaper to remove the iron oxide skin on the back of the two samples and weld the copper wires, place them in the PVC pipe and use E51 epoxy resin and triethylenetetramine curing agent for cold mounting for 24 hours.
[0029] Step 3: Grind and polish the surface of the cold-mounted sample, wash it with acetone, and dry it with cold air.
[0030] Step 4: Use the electrochemical workstation to test th...
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The invention discloses a method for testing porosity of a surface oxide iron sheet of a hot-rolled steel plate. The method comprises the following steps: taking the original iron oxide sheet and thehot-rolled steel plate with oxide iron sheet completely removed as a working surface, removing the oxide iron sheet of a back surface with abrasive paper to weld a copper guide wire, placing into a non-metal tube, cold inlaying with epoxy resin and a curing agent, enabling a working area to be 1 cm<2>, cleaning a test sample with acetone, and blow-drying with cold air; testing electrochemical alternating-current impedance curves of two test samples through a tri-electrode system, wherein the test samples are working electrodes, a Pt sheet is an auxiliary electrode, and a reference electrode isa saturated calomel electrode; adopting 3.5% NaCl as an experimental solution, and enabling scanning range of alternating-current impedance to be 10 kHz-10mHz. An alternating-current impedance curveis fitted to polarized resistance values R0 and Rf of test samples, wherein porosity is R0 / Rf. The method can be used for quickly and accurately testing porosity of surface oxide iron sheet of the hot-rolled steel plate, and quickly judging whether corrosion probability appears during a storage and transportation period of the hot-rolled steel plate or not, so that atmospheric corrosion resistanceis estimated.
Description
technical field [0001] The invention relates to a method for detecting the oxide scale structure on the surface of a hot-rolled steel plate, in particular to a method for testing the porosity of the oxide scale on the surface of a hot-rolled steel plate, and belongs to the field of surface structure analysis of iron and steel materials. Background technique [0002] The production of hot-rolled strip steel usually goes through several main processes such as slab heating, rolling and coiling. During the heating and rolling process, due to high temperature and external oxidizing atmosphere, "primary iron oxide scale" and "primary oxide scale" will be formed on the surface of the steel plate. Secondary iron oxide scale", the iron oxide scale in these two stages is often completely removed by a high-pressure water hydraulic dephosphorization machine. In the coiling stage, a layer of iron oxide scale is also formed on the surface of the steel plate, which is called "tertiary oxid...
Claims
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IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 高立军杨建炜曹建平刘立伟姜杉王胜荣许斐范
Owner SHOUGANG CORPORATION