Economical chloride ion corrosion-resistant steel bar material

An economical ion corrosion technology, applied in the field of corrosion-resistant steel bars, can solve the problems of high cost of corrosion-resistant steel bars, achieve stable corrosion resistance, reduce maintenance costs, and reduce construction costs

Inactive Publication Date: 2022-01-04
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention aims at the problem of high cost of corrosion-resistant steel bar materials in the prior art, and provides an alloy corrosion-resistant steel bar with excellent corrosion resistance and low cost used in a chloride-salt environment

Method used

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  • Economical chloride ion corrosion-resistant steel bar material
  • Economical chloride ion corrosion-resistant steel bar material
  • Economical chloride ion corrosion-resistant steel bar material

Examples

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Embodiment 2

[0050] In Example 2, the mass ratio of Cr to Ni is 33.7, which is not in the range of (5-10):1, and the depassivation life is shorter than that of Example 1, but when the thickness of the protective layer reaches 65mm, it is predicted that the depassivation life has already Reaching more than 100 years, the relative cost is only about 1.5 times that of ordinary steel bars, and it still has a good performance-cost effect.

[0051] By adjusting the thickness of the protective layer to 65mm, the corrosion-resistant steel bar of the present invention can have a service life of 100 years. However, in order not to make the thickness of the protective layer too large (when the protective layer is thicker, the cracks of the structure are difficult to control, and the bearing capacity of the structure will also be reduced), the present invention optimizes the content of the corrosion-resistant alloy elements Cr and Ni to meet the service life requirements.

[0052] It can be seen from...

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Abstract

The invention relates to the technical field of corrosion-resistant steel bar materials, in particular to an economical chloride ion corrosion-resistant steel bar material, which is characterized by comprising the following components in percentage by weight: 0.04 to 0.08 percent of C, 0.06 to 0.36 percent of Si, 0.10 to 1.20 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 4.0 to 5.5 percent of Cr, 0.15 to 1.1 percent of Ni, 0.18 to 0.30 percent of Cu, 0.020 to 0.035 percent of V and the balance of Fe and inevitable impurity elements. According to the economical chloride ion corrosion-resistant steel bar material disclosed by the invention, through optimal arrangement of all alloy elements and optimization of the content ranges and proportions of Cr and Ni, the cost of a steel bar material can be reduced, the service life of a reinforced concrete structure is remarkably prolonged, the use requirements of ocean engineering are met, the highest cost performance is achieved, and large-scale popularization and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of corrosion-resistant steel bars, in particular to an economical chlorine ion corrosion-resistant steel bar material suitable for marine environments. Background technique [0002] With the deepening of my country's "marine power" strategy, the durability of sea-related structures has become increasingly prominent. Among the many causes of durability failure of concrete structures, steel corrosion is the primary cause. In the alkaline environment of concrete, a stable metal oxide-passive film will be formed on the surface of the steel bar. The passivation film acts to protect the reinforcement from corrosion. However, when the reinforced concrete structure is corroded by chloride ions, due to the strong penetrating power and depassivation effect of chloride ions, when the chloride ion content around the steel bars reaches a certain concentration (this concentration is called the critical chloride ion conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/46
CPCC22C38/02C22C38/04C22C38/42C22C38/46
Inventor 钟小平李家豪彭蓝鸽戴仁礼
Owner YANGZHOU UNIV
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