On-line acid blueing method for hot-rolled steel bars

An acid and bluing technology, applied in the direction of metal material coating process, can solve the problems of high cost, corrosion of steel bars, increase project cost, etc., and achieve the effect of high production efficiency, anti-corrosion, and good anti-rust and anti-corrosion performance.

Active Publication Date: 2021-05-18
HUNAN 3T NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the corrosion-resistant steel bars coated with metal and coated with organic coatings have good corrosion resistance, but due to the high cost, only a small number of special buildings can be used, and most buildings still use Ordinary hot-rolled steel bars without special anti-rust treatment
Steel bar manufacturers and builders hope that the steel bars will not rust before use, but the steel bars placed on the construction site cannot avoid wind, rain, and sun exposure, so the corrosion of steel bars is more serious
In addition, some important projects also need to add corrosion inhibitors to the concrete to prevent the steel bars in the concrete from rusting, which undoubtedly increases the project cost.

Method used

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  • On-line acid blueing method for hot-rolled steel bars
  • On-line acid blueing method for hot-rolled steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Use H 3 PO 4 , Ca(NO 3 ) 2 , MnO 2 Soluble in H 2 O is configured as an acidic roasting blue solution, and H is controlled 3 PO 4 , Ca(NO 3 ) 2 , MnO 2 The mass concentrations are 4g / L, 140g / L, and 18g / L respectively; the pressure of the spraying device corresponding to the first acidic bluing liquid spray process, the second acidic bluing liquid spray process, and the washing spray process is 0.35 MPa; the temperature of the hot-rolled steel bar after the water washing and spraying process is controlled at 540±20°C. After the steel bar is dried by using the waste heat of rolling, black Fe is formed on the surface of the steel bar 3 o 4 Anti-rust film.

Embodiment 2

[0044] Use H 3 PO 4 , Ca(NO 3 ) 2 , MnO 2 Soluble in H 2 O is configured into an acidic bluing liquid, and the concentration of the bluing liquid used in the first acidic bluing liquid spray process is: H 3 PO 4 The mass concentration is 18g / L, Ca(NO 3 ) 2 The mass concentration is 70g / L, MnO 2 The mass concentration is 13g / L; the concentration of the bluing liquid used in the second acidic bluing liquid spray process is: H 3 PO 4 The mass concentration is 10g / L, Ca(NO 3 ) 2 The mass concentration is 100g / L, MnO 2 The mass concentration is 12g / L; the pressure of the spraying device is controlled to 0.3MPa; the temperature of the hot-rolled steel bars after washing and spraying is controlled at 560±20°C. After the steel bar is dried by using the waste heat of rolling, black Fe is formed on the surface of the steel bar 3 o 4 Anti-rust film.

[0045] In order to further illustrate the advantages of the on-line acid blueing method for hot-rolled steel bars provided...

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Abstract

The invention provides an online acid bluing method for hot-rolled steel bars. The hot-rolled steel bar online acid bluing method, the invention point is: after the hot-rolled steel bar is output by the hot rolling mill, the acid bluing liquid spraying process and the water washing spraying process are carried out in sequence, and a dense layer is quickly formed on the surface of the hot-rolled steel bar. Fe 3 o 4 The protective layer. The hot-rolled steel bar online acid bluing method provided by the invention can quickly generate a layer of dense Fe on the surface of the hot-rolled steel bar. 3 o 4 The protective layer has the effect of preventing corrosion of steel bars, and has the advantages of low cost and simple process.

Description

technical field [0001] The invention relates to the technical field of antirust treatment of steel bars, in particular to an online acid bluing method for hot-rolled steel bars. Background technique [0002] The steel bars used in construction are placed in the open air environment for a long time, and red rust spots will inevitably appear. As we all know, the corrosion of steel bars not only affects the mechanical properties of steel bars, but also affects the bonding force between steel bars and concrete, the bearing capacity and durability of concrete components. Especially for buildings in harsh environmental conditions, high air humidity, and intrusion of harmful substances, as well as hydraulic structures, the corrosion of steel bars caused by external conditions is more serious, and the structures are easy to fail or even be destroyed. Moreover, once the steel bar corrodes, it is generally impossible to replace it. [0003] For a long time, the influence of corroded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/76C23C22/22
CPCC23C22/22C23C22/76
Inventor 黄玲李聚良向勇曾麟芳
Owner HUNAN 3T NEW MATERIAL
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