Multi-system protective layer reinforcing steel bar and preparation method thereof

A protective layer, multi-system technology, applied in the direction of coating, metal material coating process, device for coating liquid on the surface, etc., can solve problems such as concrete structure damage, and achieve extended service life, reduced cost, and good protective performance. Effect

Active Publication Date: 2021-10-08
NORTH CHINA INST OF AEROSPACE ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at a series of problems such as concrete structure damage caused by the corrosion of steel bars in the current harsh environment, the invention provides a hot-dip galvanized aluminum alloy coating / coating multi-system protective layer steel bar and its preparation method

Method used

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  • Multi-system protective layer reinforcing steel bar and preparation method thereof
  • Multi-system protective layer reinforcing steel bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The steel bar (wire rod) with black scale after rolling is set off and straightened, and then subjected to through-type shot blasting to obtain the exposed steel bar after the scale is removed, and then washed with water or wiped with an air knife in turn (Remove residual water stains or floating dust on the surface of the steel bar), then the steel bar enters the induction heating solenoid filled with nitrogen for high-frequency induction heating, and then passes through the molten Galfan alloy liquid horizontally, and passes through the steel matrix and the molten alloy liquid (400 ~ 450 ° C ) mutual infiltration, diffusion growth and other processes to form a bright and dense zinc-aluminum alloy coating on the surface of the steel bar, and then use nitrogen to wipe with an air knife (8) to remove the alloy liquid attached to the surface of the steel bar to control the thickness of the coating (10-30 μm), with After the steel bar with zinc-aluminum alloy coating is coo...

Embodiment 2

[0066] The steel bars (wire rods) with black oxide skin after rolling are derusted with hydrochloric acid (15wt%) after being laid out and straightened. Wipe with an air knife (remove residual water stains on the surface of the steel bar), then the steel bar enters a ring-shaped spray device to spray additives, dry it in an environment of 150-200 ° C, and then enter the molten Galfan alloy liquid for hot-plating Alloy to form a Galfan alloy covering layer, wiped with nitrogen and then cooled to 200-250°C for polyester powder spraying, forming a uniform resin-based outer coating on the alloy-coated steel bar, and then solidified and cooled to obtain a hot-dip galvanized aluminum alloy Plating / coating dual-system protective layer steel bars are then inspected and packed into storage.

Embodiment 3

[0068] The multi-system protective layer reinforcing bar of this embodiment, the reinforcing bar comprises:

[0069] The steel matrix of the core,

[0070] Hot-dip galvanized aluminum-based alloy covering layer 2 metallurgically combined with the steel substrate,

[0071] The passivation film coated on the outer surface of the hot-dip galvanized aluminum alloy coating,

[0072] A resin-based overcoat 3 applied on the outer surface of the passivation film.

[0073] The passivation film is a silane corrosion inhibitor passivation film.

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Abstract

The invention relates to a multi-system protective layer reinforcing steel bar and a preparation method thereof. The reinforcing steel bar comprises a steel substrate at a core part, a hot-dip galvanized aluminum alloy covering layer (2) and a resin-based outer coating (3). The aluminum content of the hot-dip galvanized aluminum alloy covering layer (2) is 0.1-10 wt%, the hot-dip galvanized aluminum alloy covering layer (2) comprises a zinc-aluminum-magnesium coating, a zinc-aluminum-silicon coating or a zinc-aluminum-zirconium coating, preferably a Galfan alloy coating, and the thickness of the coating is 10-30 micrometers. According to the preparation method, a continuous plating process is adopted for hot dipping. The alloy plating layer/coating multi-system protective layer can provide perfect corrosion protection compared with independent zinc plating or independent coating protection, is advanced in preparation process, environment-friendly, efficient, energy-saving, emission-reducing and moderate in cost, can prolong the service life of a building in a severe environment to the maximum extent, and is suitable for the fields of buildings, bridges, seaport facilities and the like.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion protection, and in particular relates to a hot-dip galvanized aluminum alloy coating / coating multi-system protective layer steel bar and a preparation method thereof. Background technique [0002] The corrosion resistance of steel bars is one of the important factors that determine the service life of buildings. In order to improve the service life of reinforced concrete structures in harsh environments, researchers focus on improving the corrosion resistance of steel bars to meet the design requirements of high performance and long life of engineering structures. At present, the main methods used are: 1) epoxy-coated steel bars; 2) hot-dip galvanized steel bars; 3) stainless steel bars; [0003] Epoxy-coated steel bars have risen abroad. Since the 1980s, epoxy-coated steel bars have been popularized and used in China, and have achieved positive results. However, epoxy-coated steel bars a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02C23C2/26C23C22/53C23C2/36B05D5/00B05D7/14
CPCC23C2/06C23C2/02C23C2/26C23C22/53C23C2/36B05D5/00B05D7/14C23C2222/20
Inventor 李冲冲曹博皓王倩沈文旗
Owner NORTH CHINA INST OF AEROSPACE ENG
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