Salt spray evaluation method for protection capability of nano metal coating on surface of hot-rolled steel plate
A nano-metal film and hot-rolled steel sheet technology, which is applied in the field of steel production, can solve the problems of inability to evaluate the corrosion resistance of the nano-metal-coated hot-rolled steel sheet surface and the difficulty of thin sheets, and achieves good drainage, strong operability, and strong applicability. sexual effect
Active Publication Date: 2021-03-09
NANJING IRON & STEEL CO LTD
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Problems solved by technology
However, due to the presence of scale on the hot-rolled steel sheet, or the surface is shot blasted / sand treated, the surface quality of the hot-rolled steel sheet is different from that of the cold-rolled steel sheet, and the thickness specifications range from a few millimeters to tens of millimeters, so it is difficult to process it into a thin sheet with a thickness of 1mm. Therefore, this standard method cannot evaluate the corrosion resistance of nano-metal coatings on the surface of hot-rolled steel sheets.
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[0036] This embodiment provides a salt spray evaluation method for the protection ability of a nano-metal coating on the surface of a hot-rolled steel plate, which is used to evaluate the protective effect of a certain nano-metal coating on the surface of a hot-rolled steel plate Q345B with scale, specifically including:
[0037] (1) Test preparation
[0038] ① Sample processing
[0039] Cut a sample 4 of 100mm×75mm from the full thickness direction of the hot-rolled steel plate Q345B with a thickness of 6mm (d≤8mm), and keep the original scale surface;
[0040] ② Nano metal film coating
[0041] Clean and dry sample 4 with absolute ethanol; paint the nano metal film on the surface of sample 4 with a brush, dry at room temperature for 24 hours, place in an oven at 200°C, and bake for 0.5 hours; the film thickness after coating Around 14μm;
[0042] ③ Uncoated surface package
[0043] Use 704 silicone rubber to encapsulate the remaining sides of the uncoated nano-metal film...
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The invention discloses a salt spray evaluation method for the protection capability of a nano metal coating on the surface of a hot-rolled steel plate, which relates to the technical field of steel production. The method comprises the following three parts of test preparation, design and manufacture of a sample holder suitable for a hot-rolled steel plate sample, and test, and combines standard salt spray test with the characteristics of the hot-rolled steel plate. The salt spray evaluation method for the protective capacity of the nano metal coating on the surface of the hot-rolled steel plate is not limited to the thickness of a salt spray test standard sample, and is suitable for evaluating the protectiveness of the nano metal coating on the hot-rolled steel plate.
Description
technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a salt spray evaluation method for the surface protection ability of a nano-metal coating on a hot-rolled steel plate. Background technique [0002] At present, the anti-corrosion technology for the surface of hot-rolled steel sheets in domestic and foreign steel mills is relatively scarce. Nano-metal coating technology is a subversive manufacturing technology for functional structural materials in the industry, subverting the current production organization of carbon steel structure processing and manufacturing This model eliminates the need for shot blasting and rust removal in the steel structure processing and manufacturing unit, reduces the workload of anti-rust spraying, is environmentally friendly, and has significant advantages when used on the surface of hot-rolled steel plates. At present, there is no clear standard or public technology to evaluate the...
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Login to View More IPC IPC(8): G01N17/00
CPCG01N17/006G01N17/002
Inventor 杨文秀范益陈林恒蔡佳兴
Owner NANJING IRON & STEEL CO LTD