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Hot-rolled weathering steel rust layer stabilizing treatment agent and treatment method

A stabilized, weather-resistant steel technology, applied in the direction of metal material coating technology, etc.

Pending Publication Date: 2022-01-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The prior art has not yet involved the treatment agent and treatment method for stabilizing hot-rolled weathering steel with iron scale by using pickling waste liquid

Method used

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  • Hot-rolled weathering steel rust layer stabilizing treatment agent and treatment method
  • Hot-rolled weathering steel rust layer stabilizing treatment agent and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Pickling waste liquid is used as pretreatment component A, wherein the concentration of each ion is: Fe 3+ The ion content is 40g / L, Fe 2 + The ion content is 30g / L, Cl - The ion content is 50g / L and the pH value is 5.

[0040] Configure post-processing component B, where K 2 Cr 2 o 7 The content is 20g / L, Sb(NO 3 ) 3 The content is 10g / L, SnSO 4 The content is 5 / L.

[0041] Clean the surface of the hot-rolled weathering steel to ensure that the surface is free of oil, dust and paint. Heat component A to 50°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 2 hours. Repeated brushing, ventilation and drying 3 times. A uniform yellow rust layer is formed on the surface of the hot-rolled weathering steel until there is no exposed iron oxide scale. Heat component B to 70°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 1 hour. Repeated brushing, ventilation and drying 2 times. A uniform brown rus...

Embodiment 2

[0044] Pickling waste liquid is used as pretreatment component A, wherein the concentration of each ion is: Fe 3+ The ion content is 100g / L, Fe 2+ The ion content is 90g / L, Cl - The ion content is 120g / L and the pH value is 1.

[0045] Configure post-processing component B, where K 2 Cr 2 o 7 The content is 50g / L, Sb(NO 3 ) 3 The content is 20g / L, SnSO 4 The content is 10g / L.

[0046] Clean the surface of the hot-rolled weathering steel to ensure that the surface is free of oil, dust and paint. Heat component A to 70°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 3 hours. Brush repeatedly, ventilate and dry 5 times. A uniform yellow rust layer is formed on the surface of the hot-rolled weathering steel until there is no exposed iron oxide scale. Heat component B to 90°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 2 hours. Repeated brushing, ventilation and drying 4 times. A uniform brown rust l...

Embodiment 3

[0048] Pickling waste liquid is used as pretreatment component A, wherein the concentration of each ion is: Fe 3+ The ion content is 50g / L, Fe 2 + The ion content is 60g / L, Cl - The ion content is 90g / L and the pH value is 3.

[0049] Configure post-processing component B, where K 2 Cr 2 o 7 The content is 40g / L, Sb(NO 3 ) 3 The content is 15g / L, SnSO 4 The content is 8g / L.

[0050] Clean the surface of the hot-rolled weathering steel to ensure that the surface is free of oil, dust and paint. Heat component A to 60°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 2.5 hours. Repeated brushing, ventilation and drying 4 times. A uniform yellow rust layer is formed on the surface of the hot-rolled weathering steel until there is no exposed iron oxide scale. Heat component B to 80°C, evenly paint on the surface of hot-rolled weathering steel, and let it dry for 1.5 hours. Repeated brushing, ventilation and drying 2 times. A uniform bro...

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Abstract

The invention discloses a hot-rolled weathering steel rust layer stabilizing treatment agent. The agent comprises a pretreatment component A and a post-treatment component B; the pretreatment component A is pickling waste liquid with the pH value of 1-5, and the concentration range of each ion is as follows: the content of Fe <3+> ions is 40 g / L-100 g / L, the content of Fe <2+> ions is 30 g / L-90 g / L, and the content of Cl <-> ions is 50 g / L-120 g / L; and the post-treatment component B is a mixed aqueous solution of K2Cr2O7, Sb (NO3) 3 and SnSO4, the content of the K2Cr2O7 is 20 g / L-50 g / L, the content of the Sb (NO3) 3 is 10 g / L-20 g / L, and the content of the SnSO4 is 5 g / L-10 g / L. According to the agent, a hot-rolled weathering steel rust layer with oxidized scale can be stabilized, and the oxidized scale on the surface of treated hot-rolled weathering steel is converted into a brown rust layer; meanwhile, reutilization of the pickling waste liquid is realized; and the thickness of the treated hot-rolled weathering steel surface rust layer is larger than 10 microns, the color difference delta E of the rust layer is larger than 65, and the rust layer is in a fine and uniform brown particle shape.

Description

technical field [0001] The invention specifically relates to a treatment agent for stabilizing the rust layer of hot-rolled weather-resistant steel and a treatment method. Background technique [0002] Under natural bare conditions, it takes a long time for the surface of weathering steel to form a dense and stable protective rust layer. During this period, environmental pollution problems such as rust liquid sagging and scattering usually occur. Especially when atmospheric pollutants (Cl - , SO 2 ) when the concentration is high, the sag phenomenon is more serious, which not only causes some pollution to the environment, but also greatly affects the appearance of weathering steel buildings. Therefore, for these areas, the use of weathering steel without painting requires rust stabilization treatment. [0003] The surface of hot-rolled weathering steel is covered with a layer of oxide, which will affect the quality of rust stabilization treatment. Therefore, most of the...

Claims

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Application Information

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IPC IPC(8): C23C22/78C23C22/24C23G1/08
CPCC23C22/78C23C22/24C23G1/08
Inventor 郎丰军李江文程鹏洪霞庞涛陈勇马颖
Owner 武汉钢铁有限公司
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