Environment-friendly reinforcing bar corrosion inhibitor

Abstract

The invention discloses an environment-friendly reinforcing bar corrosion inhibitor comprising the following components in percentage by mass: 0.5-1.5% of sodium benzoate, 0.5-1.5% of sodium silicate, 0.5-1.5% of gluconic acid, 0.5-1.5% of citric acid and the balance of water. According to the invention, the anode type corrosion inhibiting components are compounded with mixed type corrosion inhibiting components, so that the environment-friendly reinforcing bar corrosion inhibitor is little in dosage, strong in corrosion inhibiting effect, strong in reinforcing bar adsorption force and good in concrete adaptability and can be directly coated on the surface of the reinforcing bar to form a compact protective film to ensure that the effective utilization rate of the corrosion inhibitor is increased and a corrosion inhibiting effect is provided while the concrete performances are not influenced at the same time; and the corrosion inhibitor is capable of effectively slowing down and preventing the corrosion of the reinforcing bar in the reinforced concrete, has the characteristics of no nitrite, no alkali, no toxin, no pollution and the like and can be widely used for reinforced concrete structures such as water conservancy, railways and civil architectures.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an environment-friendly 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 th...

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 disadvantages are: when the amount of incorporation is insufficient, it will cause local corrosion and accelerate the progress of corrosion; this type of rust inhibitor is toxic and carcinogenic, and its use has been expressly prohibited in some countries and regions; Agents are substances that can prevent or slow down the cathodic process, such as certain phosphates and some organic compounds. Although such substances are not dangerous, when used alone, their antirust effect is not ideal 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 mixed, 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