CN104743953A - Low-cost rebar corrosion inhibitor - Google Patents
Low-cost rebar corrosion inhibitor Download PDFInfo
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- CN104743953A CN104743953A CN201510096129.1A CN201510096129A CN104743953A CN 104743953 A CN104743953 A CN 104743953A CN 201510096129 A CN201510096129 A CN 201510096129A CN 104743953 A CN104743953 A CN 104743953A
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Abstract
The invention discloses a low-cost rebar corrosion inhibitor and belongs to the technical field of building materials. The corrosion inhibitor is compounded of corrosion inhibition components (sodium benzoate, sodium acetate, thiocarbamide and magnesium oxide) and water serving as a dispersion medium, wherein sodium benzoate is an organic type corrosion inhibition component and belongs to anodic corrosion inhibition components; sodium acetate and thiocarbamide are organic type corrosion inhibition components and belong to mixed type corrosion inhibition components; magnesium oxide is an inorganic type corrosion inhibition component; therefore, the corrosion inhibitor disclosed by the invention is compounded of the organic and inorganic corrosion inhibition components and also is a mixture and a composition of the anodic corrosion inhibition component and the mixed type corrosion inhibition component, so that the prepared corrosion inhibitor has obvious inhibition effects on the anodic reaction and cathodic reaction in the rebar corrosion process, the defects of singly using organic or inorganic corrosion inhibition component is overcome. The corrosion inhibitor is low in price, low in use amount, non-toxic and pollution-free, and can be used in a way of being directly mixed with concrete, is well adapted to the concrete, and can be widely applied to reinforced concrete structure of water conservancy, railways, and civil buildings.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of low cost reinforcing steel bar corrosion inhibitor.
Background technology
Steel Concrete is a kind of economical and practical structured material, is used widely in the structures such as bridge, buildings, dykes and dams, subbottom tunnel and Offshore Platform.Reinforcement in concrete corrosion has become the principal element affecting reinforced concrete structure durability.In newly-built Steel Concrete, due to the existence of high alkalinity Pore Solution, rebar surface can generate one deck passive film, plays a protective role to reinforcing bar.But As time goes on, due to CO
2intrusion cause concrete carbonization, the basicity of concrete pore solutions reduces, and the passive film of rebar surface becomes unstable, and in surrounding medium, chlorion permeates to rebar surface, can cause the heavy corrosion of reinforcing bar.
The mechanism of action of reinforcing steel bar corrosion inhibitor is to make rebar surface form the passive film of complete densification, (as Cl when passive film is subject to local failure
-invade), rust inhibitor can make passive film repair in time, automatically, thus effectively stops harmful ion to the erosion of reinforcing bar.Even if rebar surface corrodes, rust inhibitor also can suppress the electrochemical process of reinforcement corrosion, and erosion rate is significantly reduced.
Difference according to chemical composition, reinforcing steel bar corrosion inhibitor can be divided into three classes: the inorganic type primarily of inorganic substance composition, the organic type primarily of organic substance composition and the mixed type be made up of inorganic and organic substance.
Inorganic type rust inhibitor mainly comprises nitrite, nitrate, chromic salt, dichromate, phosphoric acid salt, polyphosphate, silicate, molybdate etc., wherein nitrites is research application reinforcing steel bar corrosion inhibitor the earliest, and it is the Anodic Type rust inhibitor of a quasi-representative.But may local corrosion be caused, the carrying out of accelerated corrosion when incorporation is not enough.
Organic type rust inhibitor comprises amine, alkamine, beautiful jade polyamine, alkanolamine, fatty acid ester and their salt, and its advantage is: (1) can provide corrosion protection to Steel Concrete under various chlorine ion concentration; (2) can disperse in concrete, thus can play restraining effect to reinforcement corrosion electrochemical cathode process, antianode corrosion electrochemistry process can play restraining effect again; (3) nontoxic, environmental protection.
The synergistic effect of rust inhibitor is a phenomenon extensively existed in resistance rust mechanism.For the action effect of reinforcing steel bar rust inhibitor, meet concrete structural performance requirements simultaneously, dissimilar rust inhibitor combines by people, research and develop compound corrosion inhibitors for steel bar, and drop into engineer applied, as Chinese patent CN1827770A discloses a kind of rust inhibitor by Sodium orthomolybdate 0.01 ~ 0.05%, diethylenetriamine 0.9% ~ 4.5%, Allyl thiourea 0.08% ~ 0.19%, 1,4-butynediol 0.15% ~ 0.75%, surplus is water composition, Chinese patent CN102491668 discloses a kind of rust inhibitor by silicate 0.1% ~ 0.5%, metasilicate 0.1% ~ 1.5%, organic amine 0.1% ~ 1.5%, gluconic acid 0.1% ~ 1.5%, surplus is water composition, and above-mentioned disclosed rust inhibitor is compound corrosion inhibitors for steel bar, but its resistance rust component content is high, cost is high, and economic benefit is low, is not easy to industrial application.
Therefore, a kind of resistance rust component prescription is researched and developed simple, the reinforcing steel bar corrosion inhibitor that consumption is few, to promoting that the industrial development of Steel Concrete is significant.
Summary of the invention
In order to realize the defect overcoming prior art, the object of the present invention is to provide a kind of low cost reinforcing steel bar corrosion inhibitor.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of low cost reinforcing steel bar corrosion inhibitor, be made up of the component of following weight percentage: Sodium Benzoate 0.1 ~ 0.3%, sodium-acetate 0.1 ~ 0.3%, thiocarbamide 0.01 ~ 0.03%, magnesium oxide 0.01 ~ 0.03%, surplus is water.
Described low cost reinforcing steel bar corrosion inhibitor is prepared by following methods and obtains: each component weighed by mass percentage, mixes and stirs, to obtain final product.
Described low cost reinforcing steel bar corrosion inhibitor, can directly mix in concrete during use.
Low cost reinforcing steel bar corrosion inhibitor of the present invention is resistance rust composition by Sodium Benzoate, sodium-acetate, thiocarbamide, magnesium oxide, and being that dispersion medium is composite with water forms.Wherein Sodium Benzoate is organic type resistance rust composition, belongs to Anodic Type resistance rust composition, can form the protective membrane of one deck densification, play very large restraining effect to the corrosion of reinforcing bar in positive column; Sodium-acetate and thiocarbamide are organic type resistance rust composition, belong to mixed type resistance rust composition, by with chlorion competitive adsorption, form fine and close protective membrane eventually through sequestering action at rebar surface, weaken the absorption of chlorion, reinforcing bar is played a protective role; Magnesium oxide is inorganic type resistance rust composition, meets water and can generate magnesium hydroxide, can maintain the high alkalinity of concrete pore solutions, play a protective role further to reinforcing bar.Therefore, reinforcing steel bar corrosion inhibitor of the present invention becomes rusty composition for base-material with multiple organic and inorganic resistance, be that dispersion medium is composite with water to form, and mix composite anode resistance rust composition and mixed type resistance rust composition, the rust inhibitor of preparation is made all to have significant restraining effect to the anodic reaction of reinforcement corrosion process, cathodic reaction, each component mutually acts synergistically in the amount ranges limited, and improves the anticorrosion performance of rust inhibitor, promotes concrete endurance quality and concrete comprehensive resistance to corrosion.
Low cost reinforcing steel bar corrosion inhibitor raw material sources of the present invention are extensive, and price is low, directly can mix in concrete and use, good with concrete adaptability.Compare existing antirust for reinforced concrete; antirust for reinforced concrete resistance rust Ingredient Amount of the present invention is few, and cost is low, can at the protective membrane of reinforcing steel bar corrosion inhibitor Surface Creation densification; both reduced the usage quantity of rust inhibitor, while not affecting concrete performance, the effect of resistance rust had been played to reinforcing bar again.
Low cost reinforcing steel bar corrosion inhibitor of the present invention, there is the features such as cost is low, consumption is few, nontoxic, pollution-free, the corrosion of effective alleviation and prevention reinforced concrete, for in the skeleton constructions such as water conservancy, railway, covil construction, the working life of significant prolongation buildings, bring significant economic benefit and social benefit.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but does not form any limitation of the invention.
The starting benzoic acid sodium, sodium-acetate, thiocarbamide and the magnesium oxide that relate in embodiment are commercially available prod.
Embodiment 1
The present embodiment low cost reinforcing steel bar corrosion inhibitor is made up of the component of following mass percent: Sodium Benzoate 0.1%, sodium-acetate 0.3%, thiocarbamide 0.01%, magnesium oxide 0.03%, and surplus is water.Described reinforcing steel bar corrosion inhibitor is prepared by following methods: each component weighed by mass percentage, mixes and stirs, to obtain final product.
When the present embodiment low cost reinforcing steel bar corrosion inhibitor mixes concrete use, the concrete incorporation of every cubic metre is 1kg, lower than the 4 ~ 10kg/m being defined in the recommendation of district's rust inhibitor under water in " reinforcing steel bar corrosion inhibitor operation technique code "
3concrete incorporation, reduces the consumption of rust inhibitor.
Embodiment 2
The present embodiment low cost reinforcing steel bar corrosion inhibitor is made up of the component of following mass percent: Sodium Benzoate 0.2%, sodium-acetate 0.2%, thiocarbamide 0.03%, magnesium oxide 0.01%, and surplus is water.Described reinforcing steel bar corrosion inhibitor is prepared by following methods: each component weighed by mass percentage, mixes and stirs, to obtain final product.
When the present embodiment low cost reinforcing steel bar corrosion inhibitor mixes concrete use, the concrete incorporation of every cubic metre is 1kg, lower than the 4 ~ 10kg/m being defined in the recommendation of district's rust inhibitor under water in " reinforcing steel bar corrosion inhibitor operation technique code "
3concrete incorporation, reduces the consumption of rust inhibitor.
Embodiment 3
The present embodiment low cost reinforcing steel bar corrosion inhibitor is made up of the component of following mass percent: Sodium Benzoate 0.3%, sodium-acetate 0.1%, thiocarbamide 0.02%, magnesium oxide 0.02%, and surplus is water.Described reinforcing steel bar corrosion inhibitor is prepared by following methods: each component weighed by mass percentage, mixes and stirs, to obtain final product.
When the present embodiment low cost reinforcing steel bar corrosion inhibitor mixes concrete use, the concrete incorporation of every cubic metre is 1kg, lower than the 4 ~ 10kg/m being defined in the recommendation of district's rust inhibitor under water in " reinforcing steel bar corrosion inhibitor operation technique code "
3concrete incorporation, reduces the consumption of rust inhibitor.
Test example
According to the requirement of JT/T537-2004 " antirust for reinforced concrete " and YB/T9231-98 " reinforcing steel bar corrosion inhibitor operation technique code ", test the salt water resistance saturating machine of the rust inhibitor described in the embodiment of the present invention 1, embodiment 2, embodiment 3, test result is as shown in table 1:
The corrosion rate of weight loss (%) of table 1 reinforcing bar HPB235 in 3.5%NaCl solution
| Rust inhibitor | Corrode 10 days | Corrode 20 days | Corrode 30 days |
| Nothing | 0.08 | 0.11 | 0.18 |
| Embodiment 1 | 0.03 | 0.05 | 0.08 |
| Embodiment 2 | 0.02 | 0.04 | 0.08 |
| Embodiment 3 | 0.03 | 0.05 | 0.07 |
Result shown in above-mentioned table 1 shows, the salt water resistance impregnated structures of reinforcing steel bar corrosion inhibitor of the present invention meets code requirement, namely shows that reinforcing steel bar corrosion inhibitor of the present invention is while the resistance rust Ingredient Amount reduced, the same resistance rust effect realized Steel Concrete.
Claims (1)
1. a low cost reinforcing steel bar corrosion inhibitor, is characterized in that, is made up of the component of following weight percentage: Sodium Benzoate 0.1 ~ 0.3%, sodium-acetate 0.1 ~ 0.3%, thiocarbamide 0.01 ~ 0.03%, magnesium oxide 0.01 ~ 0.03%, and surplus is water.
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| CN201510096129.1A CN104743953B (en) | 2015-03-04 | 2015-03-04 | Low-cost rebar corrosion inhibitor |
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| CN104743953B CN104743953B (en) | 2017-01-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352826A (en) * | 2017-07-24 | 2017-11-17 | 洛阳理工学院 | A kind of reinforcing bar resistance rust composition, reinforcing steel bar corrosion inhibitor and its preparation method and application |
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| CN102079640A (en) * | 2010-12-14 | 2011-06-01 | 李丽 | High corrosion resistance reinforced concrete corrosion inhibitor |
| CN102320771A (en) * | 2010-08-04 | 2012-01-18 | 浙江五龙化工股份有限公司 | Reinforced concrete rust inhibitor |
| CN102617062A (en) * | 2012-04-06 | 2012-08-01 | 厦门大学 | Nitrite-free compound type steel bar corrosion inhibitor |
| CN103172290A (en) * | 2013-02-25 | 2013-06-26 | 洛阳理工学院 | Environment-friendly reinforcing bar corrosion inhibitor |
| CN103172292A (en) * | 2013-02-25 | 2013-06-26 | 洛阳理工学院 | Composite steel bar rust inhibitor |
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2015
- 2015-03-04 CN CN201510096129.1A patent/CN104743953B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320771A (en) * | 2010-08-04 | 2012-01-18 | 浙江五龙化工股份有限公司 | Reinforced concrete rust inhibitor |
| CN102079640A (en) * | 2010-12-14 | 2011-06-01 | 李丽 | High corrosion resistance reinforced concrete corrosion inhibitor |
| CN102617062A (en) * | 2012-04-06 | 2012-08-01 | 厦门大学 | Nitrite-free compound type steel bar corrosion inhibitor |
| CN103172290A (en) * | 2013-02-25 | 2013-06-26 | 洛阳理工学院 | Environment-friendly reinforcing bar corrosion inhibitor |
| CN103172292A (en) * | 2013-02-25 | 2013-06-26 | 洛阳理工学院 | Composite steel bar rust inhibitor |
Non-Patent Citations (1)
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| 阮承祥主编: "《混凝土外加剂及其工程应用》", 31 December 2008, 江西科学技术出版社 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352826A (en) * | 2017-07-24 | 2017-11-17 | 洛阳理工学院 | A kind of reinforcing bar resistance rust composition, reinforcing steel bar corrosion inhibitor and its preparation method and application |
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