A kind of steel rust inhibitor

Abstract

The invention relates to a steel bar corrosion inhibitor which is composed of a compaction component and a corrosion inhibition component, wherein the compaction component is silicate mineral which accounts for 0.5-1.0 wt% of the cementing material in concrete; and the corrosion inhibition component is composed of 1-amino-8-naphthyl-3,6-disulfonic acid monosodium salt which accounts for 0.10-0.30 wt% of the cementing material in the concrete, thiocarbamide which accounts for 0.15-0.30 wt% of the cementing material in the concrete, nitrto bicyclohexylamine which accounts for 0.25-0.40 wt% of the cementing material in the concrete, and fly ash which accounts for 1.25-1.75 wt% of the cementing material in the concrete. The corrosion inhibitor has favorable adaptability with cement, can properly improve the properties of the concrete and decelerate the permeation of the corrosive medium into the concrete, and forms a compact chemical adsorption film on the surface of the steel bar to prevent the corrosive medium and oxygen in the concrete hole solution from directly contacting the steel bar, thereby preventing electrochemical corrosion and further preventing the corrosion effect on the steel bar.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a product used for preventing corrosion of steel bars in concrete. Background technique [0002] At present, the commonly used rust inhibitors for steel bars are mainly strong oxidants (passivators) of inorganic salts, such as: nitrates, nitrites, chromates, dichromates, phosphates, etc. They can oxidize the surface of metal (mainly steel) to form a passivation film or form insoluble compounds with metal ions dissolved in the anode part of the metal surface, precipitate in the anode area, and repair the oxide film, thereby inhibiting the corrosion of steel bars. [0003] However, attention must be paid to the use of this type of rust inhibitor: when the amount of rust inhibitor is insufficient, the inconsistent oxidation degree of the surface of the steel bar may form a large cathode-small anode corrosion primary battery, resulting in local corrosion of the steel bar. Therefore...

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Problems solved by technology

[0003] However, attention must be paid to the use of this type of rust inhibitor: when the amount of rust inhibitor is insufficient, the inconsistent oxidation degree of the surface of the steel bar may form a large cathode-small anode corrosion primary battery, resulting in localized corrosion of the steel bar

Therefore, strong oxidants (passivators) of inorganic salts are dangerous in use.

[0004] In addition, when there is stray current, this kind of rust inhibitor will accelerate the corrosion of steel bars and increase the conductivity of concrete. Therefore, it is not suitable for concrete projects that do not allow the improvement of concrete conductivity.

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