CN105236792A - Composite reinforcement rust-resistant agent and application thereof - Google Patents

Abstract

The invention discloses a composite steel bar rust inhibitor, which is characterized in that it is uniformly mixed with nitrite and ethanolamine at a mass ratio of 5 to 15:1, and the purity of the nitrite and ethanolamine is greater than or equal to 99%; the advantage is that the composite steel rust inhibitor can not only repair and form a dense passivation film on the anode, block the corrosion reaction of the anode, but also act on the cathode, and block the cathode by forming an insoluble film on the cathode. Corrosion reaction, its anti-corrosion effect on steel bars is better, and the cost is lower.

Description

A kind of composite steel bar rust inhibitor and its application

technical field

The invention relates to a steel bar rust inhibitor used for reinforced concrete structures, in particular to a composite steel bar rust inhibitor and application thereof.

Background technique

Reinforced concrete structures are the most widely used structural materials in civil engineering today, but the presence of chloride ions can cause the steel to rust and the concrete to crack. Chloride ions in reinforced concrete structures mainly enter through two ways: one is from concrete raw materials, such as mixing water, sea sand, deicing salt, salt spray, and chlorine salt admixtures, etc., and the other is from the use environment, such as bridges and docks in marine environment, etc. At present, there are many kinds of steel rust inhibitors on the market, but most of them are anodic or cathodic rust inhibitors, which not only have a single effect, but also are relatively expensive.

Contents of the invention

The technical problem to be solved by the present invention is to provide a composite steel bar rust inhibitor with better anti-embroidery effect and lower cost and its application.

The technical solution adopted by the present invention to solve the above technical problems is: a composite rust inhibitor for steel bars, which is formed by uniformly mixing nitrite and ethanolamine at a mass ratio of 5 to 15:1. The purity of the nitrate and the ethanolamines is greater than or equal to 99%.

Described nitrite is calcium nitrite, sodium nitrite, potassium nitrite or lithium nitrite.

The ethanolamines are monoethanolamine, diethanolamine or triethanolamine.

The composite rust inhibitor for steel bars is formed by uniformly mixing the sodium nitrite and the diethanolamine at a mass ratio of 9.25 to 12.35:1, and the sodium nitrite and the The purity of the diethanolamine is greater than or equal to 99%.

The application of the composite steel bar rust inhibitor in concrete, the composite steel bar rust inhibitor is added to the concrete through the internal mixing method, and the mixing amount of the composite steel bar rust inhibitor is 4-5% of the mass of the gel material.

The application of the composite steel bar rust inhibitor in concrete is to dissolve the composite steel bar rust inhibitor into a saturated aqueous solution of the rust inhibitor and then apply it on the surface of the reinforced concrete structure or enter the steel bar through low-pressure pouring. in concrete structures.

Compared with the prior art, the advantage of the present invention is that the composite steel rust inhibitor can not only repair and form a dense passivation film on the anode, block the corrosion reaction of the anode, but also act on the cathode. The soluble film can block the corrosion reaction of the cathode, and it has a better anti-corrosion effect on the steel bar, and the cost is lower.

Description of drawings

Fig. 1 is the anticorrosion effect diagram of composite steel bar rust inhibitor of the present invention to the steel bar in concrete.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: A composite rust inhibitor for steel bars, which is formed by uniformly mixing calcium nitrite and monoethanolamine at a mass ratio of 15:1, wherein the purity of calcium nitrite and monoethanolamine is greater than or equal to 99% .

Embodiment 2: A composite rust inhibitor for steel bars, which is formed by uniformly mixing potassium nitrite and triethanolamine at a mass ratio of 7:1, wherein the purity of potassium nitrite and triethanolamine is greater than or equal to 99% .

Embodiment 3: A composite rust inhibitor for steel bars, which is formed by uniformly mixing lithium nitrite and diethanolamine at a mass ratio of 10:1, wherein the purity of lithium nitrite and diethanolamine is greater than or equal to 99% .

Embodiment 4: A composite rust inhibitor for steel bars, which is uniformly mixed with sodium nitrite and diethanolamine at a mass ratio of 9.25:1, wherein the purity of sodium nitrite and diethanolamine is greater than or equal to 99%.

Embodiment 5: A composite rust inhibitor for steel bars, which is uniformly mixed with sodium nitrite and diethanolamine at a mass ratio of 12.35:1, wherein the purity of sodium nitrite and diethanolamine is greater than or equal to 99%.

Embodiment 6: A composite rust inhibitor for steel bars, which is uniformly mixed with sodium nitrite and diethanolamine at a mass ratio of 11.5:1, wherein the purity of sodium nitrite and diethanolamine is greater than or equal to 99%.

Add the composite steel rust inhibitors of the above-mentioned Embodiment 4 and Embodiment 5 into the concrete respectively through the internal mixing method. The specific formula is: 20 parts by weight of cementitious material, 40 parts by weight of river sand, 17.1 parts by weight of water, composite Steel bar rust inhibitor 1 weight part; Carry out antirust test to the steel bar in concrete respectively, obtain the inhibition effect picture as shown in Figure 1, as can be seen from the figure, when the mass ratio of sodium nitrite and diethanolamine is 9.25: 1, the composite steel rust inhibitor almost completely inhibits corrosion, and when the mass ratio of sodium nitrite and diethanolamine is 12.35:1, the composite steel rust inhibitor can completely prevent rust in 12 weeks, and the rust inhibition effect reaches the maximum good.

In the actual application of the above-mentioned composite steel rust inhibitor, in addition to the internal mixing method, the composite steel rust inhibitor can also be dissolved into a saturated aqueous solution of the rust inhibitor, and then externally coated on the surface of the reinforced concrete structure or through a low-pressure Infusion into reinforced concrete structures.

Claims (6)

1. a compound corrosion inhibitors for steel bar, it is characterized in that the ratio uniform that it is 5 ~ 15:1 by nitrite and ethanolamines in mass ratio mixes, the purity of described nitrite and described ethanolamines is all more than or equal to 99%.

2. a kind of compound corrosion inhibitors for steel bar as claimed in claim 1, is characterized in that described nitrite is calcium nitrite, Sodium Nitrite, potassium nitrite or lithium nitrite.

3. a kind of compound corrosion inhibitors for steel bar as claimed in claim 2, is characterized in that described ethanolamines is Monoethanolamine MEA BASF, diethanolamine or trolamine.

4. a kind of compound corrosion inhibitors for steel bar as claimed in claim 3, the ratio uniform that to it is characterized in that by described Sodium Nitrite and described diethanolamine be 9.25 ~ 12.35:1 in mass ratio mixes, and the purity of described Sodium Nitrite and described diethanolamine is all more than or equal to 99%.

5. the application of a kind of compound corrosion inhibitors for steel bar as claimed in claim 1 in concrete, it is characterized in that described compound corrosion inhibitors for steel bar adds in concrete by inner blending method, the incorporation of described compound corrosion inhibitors for steel bar is 4 ~ 5% of the quality of gelatinous material in concrete.

6. the application of a kind of compound corrosion inhibitors for steel bar as claimed in claim 1 in concrete, enters in skeleton construction on the outer surface being coated in skeleton construction or by low-pressure injection after it is characterized in that described compound corrosion inhibitors for steel bar is dissolved into rust inhibitor saturated aqueous solution.