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Nitrite-free compound type steel bar corrosion inhibitor

A technology of steel bar rust inhibitor and nitrite, applied in the field of steel bar rust inhibitor, can solve the problems of application limitation, ineffectiveness, toxicity, etc.

Inactive Publication Date: 2012-08-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual reinforced concrete protection system, there are often many problems in the use of a single rust inhibitor, some of which cannot achieve good results, and some are toxic
For example, some nitrites are considered as good rust inhibitors for steel bars in concrete, and have been used to a certain extent, but their application has been limited due to toxicity and other reasons.

Method used

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  • Nitrite-free compound type steel bar corrosion inhibitor
  • Nitrite-free compound type steel bar corrosion inhibitor
  • Nitrite-free compound type steel bar corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the above technical scheme, the R235 light round steel bar used in construction is used as the test material. Before testing in the simulated liquid, it is processed into a cylindrical sample with a diameter of 11.2 mm and a height of 4 mm. After the sandpaper is polished step by step to remove the surface scale, one section is used to weld the copper wire. The solder joints and the side surface are encapsulated in the plastic ferrule with epoxy resin, and the other section is used as the working surface. The working area is about 1cm 2 . The SEM test electrode is a R235 light round steel bar after removing the surface scale, and then processing it into a cylindrical sample with a diameter of 5.0mm and a height of 2.0mm. Before the observation, the steel bar electrodes were polished step by step with No.400-1200 water abrasive paper, rinsed with deionized water, ultrasonically cleaned in ethanol for 10 minutes, and finally stored in a desiccator for later u...

Embodiment 2

[0036] According to the above technical scheme, the R235 light round steel bar used in construction is used as the test material. Before testing in the simulated liquid, it is processed into a cylindrical sample with a diameter of 11.2 mm and a height of 4 mm. After the sandpaper is polished step by step to remove the surface scale, one section is used to weld the copper wire. The solder joints and the side surface are encapsulated in the plastic ferrule with epoxy resin, and the other section is used as the working surface. The working area is about 1cm 2 . The SEM test electrode is R235 light round steel bar after removing the surface scale, and then processing it into a cylindrical sample with a diameter of 5.0mm and a height of 2.0mm. Before the observation, the steel bar electrodes were polished step by step with No.400-1200 water abrasive paper, rinsed with deionized water, ultrasonically cleaned in ethanol for 10 minutes, and finally stored in a desiccator for later use...

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Abstract

The invention discloses a nitrite-free compound type steel bar corrosion inhibitor and relates to the steel bar corrosion inhibitor. The invention provides the nitrite-free compound type steel bar corrosion inhibitor which can prevent steel bars in concrete from being corroded and prevent environmental pollution. The nitrite-free compound type steel bar corrosion inhibitor comprises the following components by weight: 70%-85% of diisooctyl sebacate, 3%-6% of D-sodium gluconate and 12%-27% of zinc sulfate heptahydrate. When the nitrite-free compound type steel bar corrosion inhibitor is sued, 1.5-4.5g of the nitrite-free compound type steel bar corrosion inhibitor is added into per liter of water (the water which is directly used for blending the concrete). The D-sodium gluconate and the zinc sulfate heptahydrate are compounded with the diisooctyl sebacate so as to obtain the nitrite-free compound type steel bar corrosion inhibitor.

Description

technical field [0001] The invention relates to a steel bar rust inhibitor, in particular to a nitrite-free composite steel bar rust inhibitor. Background technique [0002] Reinforced concrete is a building material widely used in modern society. It is used in the construction of structures in all walks of life and plays a great role in the construction of the national economy. Concrete pore fluid is highly alkaline under normal conditions, and a layer of dense oxide film will be formed on the surface of steel bars in this highly alkaline medium, which is in a passivation state and protected from corrosion. However, due to the erosion of external environmental media, the oxide film on the surface of steel bars may be destroyed and corroded. The main reasons are the carbonation of concrete (the carbon dioxide in the air diffuses into the concrete, reacts with the calcium hydroxide in the concrete pore fluid, and reduces the pH value of the concrete) and the erosion of chlor...

Claims

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Application Information

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IPC IPC(8): C04B24/10C04B22/14C04B103/60
Inventor 杜荣归郭亚张娟王小平林昌健
Owner XIAMEN UNIV
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