Low-dosage environment-friendly rebar corrosion inhibitor

Abstract

The invention discloses a low-dosage environment-friendly rebar corrosion inhibitor which is characterized by being prepared by mixing one or more phosphates of sodium monofluorophosphate, sodium pyrophosphate, sodium hexametaphosphate and aluminum tripolyphosphate, wherein the sodium monofluorophosphate accounts for 0-10%, the sodium pyrophosphate accounts for 0-30%, the sodium hexametaphosphate accounts for 0-50% and the aluminum tripolyphosphate accounts for 10-100% all by mass. The corrosion inhibitor has the following advantages: 1) the concrete porosity can be reduced, and the permeation rate of a corrosive medium in concrete is slowed down; 2) with low dosage, obvious influence on the working performance such as mixing property, slump and initial setting time of concrete is avoided, the corrosion inhibiting effect on rebars in concrete is obvious, and the corrosion inhibitor can be applied to the repairing of new seaport wharfs, cross-sea bridges, offshore wind power and old ocean concrete structures and the like; and 3) the environment-friendly rebar corrosion inhibitor has the advantages of obvious corrosion inhibiting effect, small dosage and no nitrite.

Description

Technical field [0001] The invention relates to a low-volume environment-friendly steel bar rust inhibitor, which belongs to the technical field of building materials. Background technique [0002] Reinforced concrete is widely used in marine engineering structures. Due to the high temperature, high humidity, and high salinity of the marine environment, the durability of marine concrete structures is often insufficient. In particular, the corrosion of steel bars in concrete structures not only reduces the interface of the steel bars and reduces the structural bearing capacity; in addition, the corrosion products have obvious volume expansion effects, which can easily cause cracks and peeling of the concrete cover, thereby further reducing the durability of the reinforced concrete structure. [0003] The rust inhibitor can form a dense protective film on the surface of the steel bar to reduce the corrosion of the steel bar, and has the advantages of convenient construction, low cost...

AI Technical Summary

Problems solved by technology

At present, inorganic rust inhibitors are usually anodic rust inhibitors with nitrite as the main agent. In addition to the toxicity of nitrite, the addition of such inhibitors in marine concrete structures is relatively high, which significantly reduces the mixing performance of concrete. and slump, and its insufficient dosage may aggravate the risk of corrosion of steel bars

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