High-performance steel bar corrosion inhibitor

Abstract

The invention discloses a high-performance steel bar corrosion inhibitor, belonging to the technical field of building materials. The corrosion inhibitor is composed of the following components in percentage by mass: 0.2-0.4% of sodium molybdate, 0.2-0.4% of sodium citrate, 0.02-0.04% of thiocarbamide, 0.02-0.04% of neodymium sulfate and the balance of water. By compounding the anode corrosion inhibition component with the mixed corrosion inhibition component, the corrosion inhibitor has the advantages of high adsorptive power with steel bars, favorable adaptability to concrete and high corrosion resistance, can be directly incorporated into concrete, can form a compact protective film on the steel bar surface, does not influence the concrete performance, can perform the corrosion inhibition function on the steel bars, has the characteristics of high efficiency, no toxicity, no pollution and the like, is a high-performance steel bar corrosion inhibitor, and can be used for reinforced concrete structures in water conservancy, railways, 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 steel bar rust inhibitor. Background technique [0002] Reinforced concrete is an economical and practical structural material, which is widely used in structures such as bridges, buildings, dams, subsea tunnels and large offshore platforms. Corrosion of steel bars in concrete has become the main factor affecting the durability of reinforced concrete structures. 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 the 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 the steel bar, it wil...

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Problems solved by technology

[0005] The synergistic effect of rust inhibitors is a widespread phenomenon in the process of rust inhibition. In order to enhance the effect of steel rust inhibitors and meet the structural performance requirements of concrete, people combine inorganic and organic rust inhibitors. , research and development of composite steel rust inhibitors, for example, Chinese patent 200610044239.4 discloses a steel rust inhibitor, the weight percentage of each component is sodium molybdate 0.01-0.05%, diethylenetriamine 0.9-4.5%, acrylic Thiourea 0.08-0.19%, 1,4-butynediol 0.15-0.75%, and the rest is water. The components in it have the effect of rust prevention through chemical interaction with steel bars and adsorption, but the diethylene The adsorption force between triamine, 1,4-butynediol and steel bar is small, so that the binding force between the prepared steel bar rust inhibitor and reinforced concrete is small, and the effect is not reliable and durable