Alkali-free non-nitrite concrete reinforcement antirust

Abstract

The invention discloses an alkali-free non-nitrite rust retardant agent for concrete steel bars, which consists of the components (according to weight percentage) as follows: 3-10 percent of zinc gluconate, 20-40 percent of lithium metasilicate, 10-20 percent of ammonium benzoate, 15-25 percent of low molecular weight (alcohol) amine and 20-40 percent of water. The rust retardant agent can obviously relieve damage to the steel bar passive films of chloride ions, has the advantages of environmental protection, alkali free, low usage, good suitability with cement and being capable of improving concrete property properly and the like, is a high-effictive rust retardant agent for concrete steel bars, and can be applied to steel bar concrete structures of water conservancy, railway, civil construction and the like.

Description

technical field [0001] The invention relates to a steel bar rust inhibitor, in particular to an alkali-free and non-nitrite concrete steel bar rust inhibitor. Background technique [0002] The two main causes of steel corrosion in concrete are carbonization and chloride ion attack. The survey shows that among all the causes of damage to concrete structures, steel bar corrosion damage is dominant, and the corrosion loss related to steel bar corrosion accounts for about 40% of the world's corrosion loss. [0003] At present, the existing reinforcement protection methods mainly include surface coating method, cathodic protection method, electrochemical desalination, re-alkalinization, and the use of rust inhibitors, etc., but studies have shown that the use of reinforcement rust inhibitors has the best economic effect. The rust inhibitors studied in the early stage mainly include sodium benzoate, various nitrites and chromates, etc., but some of these rust inhibitors have a si...

AI Technical Summary

Problems solved by technology

However, on the one hand, due to its toxicity and carcinogens, its use has been banned in European countries such as Switzerland and Germany; on the other hand, it is an anodic corrosion inhibitor, which has the potential to accelerate local corrosion of steel bars when the dosage is insufficient. dangerous

Therefore, to a certain extent, a large number of applications of this type of steel rust inhibitor in concrete are limited.

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