Composite steel bar rust inhibitor

Abstract

The invention discloses a composite steel bar rust inhibitor. The steel bar rust inhibitor comprises the following components in percentage by weight: 0.5%-1.5% of sodium silicate, 0.5%-1.0% of sodium molybdate, 0.5%-1.0% of sodium acetate, 0.1%-0.5% of thiourea and the balance of water. The composite steel bar rust inhibitor disclosed by the invention adopts an anode type rust inhibition component, a cathode type rust inhibition component and a hybrid rust inhibition component for compounding, further has the advantages of small using quantity, strong rust inhibition action, strong adsorbability with steel bars and good applicability to concrete, can be directly coated on the surfaces of the steel bars to generate a compact protective film, can improve the effective utilization rate of the rust inhibitor, play a rust inhibition role while not affecting the performances of the concrete, and effectively retard and prevent the corrosion of the steel bars in the reinforced concrete, has the characteristics of no nitrites, no alkali, no toxin, no pollution and the like, and can be widely used for reinforced concrete structures of water conservation, railway, civil buildings and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite rust inhibitor for steel bars. Background technique [0002] As an economical and practical structural material, reinforced concrete is widely used in structures such as bridges, buildings, dams, subsea tunnels and large ocean platforms. Corrosion of steel bars in concrete has become the main factor affecting the durability of reinforced concrete structures in the world today. In newly-built reinforced concrete, due to the existence of high-alkalinity pore fluid, a passivation film will be formed on the surface of the steel bar to protect the steel bar. But over time, due to CO 2 The intrusion of chlorination causes the carbonation of concrete, the alkalinity of the concrete pore fluid decreases, and the passivation film on the surface of the steel bar becomes unstable. If the chloride ions in the surrounding medium penetrate to the surface of...

AI Technical Summary

Problems solved by technology

Anodic steel rust inhibitors refer to substances that can prevent or slow down the anodic process. Typical chemical substances include chromate, nitrite, etc., which can form a passivation film on the surface of steel bars, of which nitrite is the earliest application of steel bars Rust inhibitor, its disadvantage is that when the amount of incorporation is insufficient, it will cause local corrosion and accelerate the progress of corrosion; in addition, this type of rust inhibitor also has disadvantages such as carcinogenicity, alkali aggregate reaction, and impact on slump; cathodic steel bar resistance Rust agents are substances that can prevent or slow down the cathodic process, such as certain phosphates and some organic compounds. Although these substances are not dangerous, their antirust effect is not satisfactory when used alone, and cannot meet the requirements of use; Most of the rust inhibitors in the prior art are mixed into the concrete when the concrete is being stirred, and the amount of use is large, which cannot guarantee the uniform distribution on the surface of the steel bar and will affect the performance of the concrete