Antirust for reinforced concrete

Abstract

This invention relates to an antirust agent for reinforced concrete. The antirust agent is composed of: sodium molybdate 0.01-0.05 wt.%, diethylenetriamine 0.9-4.5 wt.%, allylthiourea 0.08-0.19 wt.%, 1,4-butynediol 0.15-0.75 wt.%, and water as balance. The antirust agent can effectively alleviate and prevent the rusting of the steel bars in the reinforced concrete, as well as alleviate or inhibit the damage to the passivated film of the steel bars by chloric ions. Besides, the antirust agent has such advantages as low application amount.

Description

technical field [0001] The invention relates to a rust inhibitor, in particular to a reinforced concrete rust inhibitor. Background technique [0002] We know that the main advantages of steel corrosion inhibitors are one-time use and long-term effectiveness, which can meet the design life requirements of more than 50 years. Inexpensive and widely used. Many compounds have been or are still used as corrosion inhibitors for reinforced concrete, including sodium nitrite (calcium), potassium dichromate, stannous chloride, sodium silicate, sodium benzoate, ammonia, hydrazine, ethylenediamine, di Cyclohexylamine nitrite and so on. Among them, some corrosion inhibitors such as potassium dichromate will reduce the compressive strength of concrete more (up to 20%-40%), and some corrosion inhibitors such as stannous chloride have a shorter action time. Commonly used corrosion inhibitors such as sodium nitrite and calcium nitrite have little effect on the compressive strength of co...

AI Technical Summary

Problems solved by technology

Some corrosion inhibitors such as potassium dichromate will reduce the compressive strength of concrete more (up to 20%-40%), and some corrosion inhibitors such as stannous chloride have a shorter action time

Commonly used corrosion inhibitors such as sodium nitrite and calcium nitrite have little effect on the compressive strength of concrete and have good corrosion inhibition effects, but they are oxidative corrosion inhibitors and can only be inhibited when the amount is sufficient. Corrosion effect, otherwise it will cause serious local corrosion, and nitrite is toxic

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