Ultralow-dosage corrosion inhibitor and preparation method thereof

Abstract

The invention relates to an ultralow-dosage corrosion inhibitor and a preparation method thereof, belonging to the technical field of building materials. The ultralow-dosage corrosion inhibitor is prepared from the following components: by mass percent, 0.4% to 1% of sodium monoflurophosphate and 99.6% to 99% of mineral admixtures. The corrosion inhibitor does not contain nitrite, poses no harm to the environment and human bodies and can improve concrete strength. Compared to traditional corrosion inhibitors, the corrosion inhibitor provided in the invention has the advantages of excellent anticorrosion performance, capacity of improving concrete strength, environment friendliness, no harm and the like and is widely applicable to industrial and civil buildings which mainly suffer from chloride corrosion, e.g., buildings in marine environment areas and a steel bar retarding concrete structure which adopts deicing salts.

Description

technical field [0001] The invention relates to a preparation method of an ultra-low dosage rust inhibitor, which belongs to the technical field of building materials. Background technique [0002] Reinforced concrete structures are the most widely used building material today. The premature failure of concrete structures caused by the corrosion of steel bars in concrete is the primary factor affecting the durability of concrete, which not only destroys the safety of buildings, but also causes huge economic losses to the country. [0003] Under the condition of high alkalinity, a dense oxide film will be formed on the surface of the steel bar, which makes the surface of the steel bar passivated and protected. However, when the chloride concentration on the surface of the steel bar in the concrete is higher than a certain critical value, or the alkalinity in the pore fluid is reduced to a certain level due to the corrosion of the concrete by carbon dioxide, the passivation f...

AI Technical Summary

Problems solved by technology

[0005] At present, the most widely used rust inhibitors are nitrites, chromates, molybdates, etc. The disadvantages of these rust inhibitors include toxicity and rust resistance defects: First, they are toxic to the environment and the human body Harmful, even carcinogenic; second, once the amount of this kind of rust inhibitor is insufficient, it will accelerate the corrosion of steel bars, so it is called "dangerous" rust inhibitor

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