CN112501600A - Liquid for accelerating formation of rust layer of bridge weathering steel and anticorrosion construction process thereof - Google Patents
Liquid for accelerating formation of rust layer of bridge weathering steel and anticorrosion construction process thereof Download PDFInfo
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- CN112501600A CN112501600A CN202011311276.3A CN202011311276A CN112501600A CN 112501600 A CN112501600 A CN 112501600A CN 202011311276 A CN202011311276 A CN 202011311276A CN 112501600 A CN112501600 A CN 112501600A
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- bridge
- weathering steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/76—Applying the liquid by spraying
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a liquid for accelerating the formation of a rust layer of bridge weathering steel and an anticorrosion construction process thereof, wherein the liquid comprises the following components: derusting the bridge weathering steel at the outdoor normal temperature and with the relative air humidity of 5-50%, wherein the derusting grade is ST 3; preparing with 90% hydrochloric acid and distilled water to obtain a solution with a concentration of 4 x 10‑4A mol/L hydrochloric acid solution for standby; prepared by using 70% sulfuric acid and distilled water to obtain a concentration of 1.72 x 10‑2A sulfuric acid solution of mol/L for standby; the spraying concentration is 4 x 10 according to the dosage of 380ml per square meter‑4The concentration of the hydrochloric acid solution is 1.72 x 10 mol/L or the dosage of 380 ml/square meter‑2A sulfuric acid solution of mol/L for waiting the bridge to resist weatherDrying the steel surface; repeating the steps for 90 days four times a day to obtain the bridge weathering steel accelerated rust layer.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a liquid for accelerating formation of a rust layer of bridge weathering steel and an anticorrosion construction process thereof.
Background
The bridge corrosion prevention is mainly divided into a steel structure part and a concrete part. The specific situation is that the anticorrosion requirement of the bridge is taken as a starting point, different anticorrosion requirements and actual situations exist in different structures and different parts of the bridge, the corrosion protection analysis can be performed on the bridge in a targeted manner, and then a specific anticorrosion coating system and a construction process are provided and executed according to national standards. The corrosion of the bridge is mainly divided into: natural corrosion, chemical corrosion and electrochemical corrosion in 3 forms. At present, the bridge protection in the prior art mainly adopts shot blasting or sand blasting to reach Sa2.5, and paint coating is carried out as soon as possible after treatment so as to avoid generating corrosion.
However, the bridge in the prior art has poor corrosion resistance, and can only meet the requirements of 2-4 years, and in addition, due to factors such as the position and the length of the bridge with a steel structure, construction equipment is difficult to build, so that the bridge is difficult to perform corrosion resistance treatment. Moreover, the bridge anticorrosion process in the prior art is mainly a non-anticorrosion treatment process on a bridge adopting weathering steel aiming at a common steel structure.
Weather resistant steel for bridge is at present as a novel material, relies on its outstanding corrosion resistance, more and more is used in urban bridge construction, nevertheless because of the unstability of its rust coating self, seriously influences bridge life, at unstable rust coating surface coating, both can't play anticorrosive effect, also influences urban bridge's pleasing to the eye.
Therefore, it is urgently needed to provide a liquid for accelerating the formation of the rust layer of the bridge weathering steel and an anticorrosion construction process thereof, so as to quickly form a compact stable rust layer, which can not affect the use of the bridge and can not cause misunderstanding of the weathering steel by people.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a liquid for accelerating the formation of a rust layer of bridge weathering steel and an anticorrosion construction process thereof, and the technical scheme adopted by the invention is as follows:
a liquid for accelerating the formation of rust layer on the bridge weathering steel is sequentially sprayed on the bridge weathering steel and has a concentration of 4 x 10-4mol/L hydrochloric acid solution and concentration of 1.72 x 10-2A sulfuric acid solution of mol/L.
An anticorrosion construction process for accelerating liquid formed by a rust layer by adopting bridge weathering steel comprises the following steps:
step S1, derusting the bridge weathering steel at the outdoor normal temperature and with the relative air humidity of 5-50%, wherein the derusting grade is ST 3;
step S2, preparing with 90% hydrochloric acid and distilled water to obtain a solution with a concentration of 4 x 10-4A mol/L hydrochloric acid solution for standby; prepared by using 70% sulfuric acid and distilled water to obtain a concentration of 1.72 x 10-2A sulfuric acid solution of mol/L for standby;
step S3, spraying the solution with the concentration of 4 x 10 according to the dosage of 380 ml/square meter-4The mol/L hydrochloric acid solution is sprayed with the concentration of 1.72 to 10 according to the dosage of 380ml per square meter after the surface of the bridge weathering steel is dried-2The sulfuric acid solution of mol/L waits for the surface of the bridge weathering steel to be dried;
step S4, repeating step S3 four times a day;
and step S5, repeating the step S4 ninety times to obtain the bridge weathering steel accelerated rust layer.
Compared with the prior art, the invention has the following beneficial effects:
(1) the liquid of the present invention contains Cl-Or SO4 -2It has strong oxidizing property, and under the condition of high-humidity environment, it is Fe3O4Oxidized into gamma-FeOOH, the gamma-FeOOH can further generate oxidation-reduction reaction to generate alpha-FeOOH and the like; the alpha-FeOOH is relatively stable and will not be further oxidized. The steel plate exposed to the sun in the natural environment can be dried quickly, and oxygen can more easily permeate into the rust layer and Fe in the dry environment2+Oxidized to amorphous FeOOH, which are converted to crystalline FeOOH by loss of water and by crystalline transformation
(2) The sulfuric acid solution and the hydrochloric acid solution can not damage a weather-resistant steel substrate to cause serious corrosion, but also can shorten the time for stabilizing the rust layer, the time for obtaining the stable rust layer by a common atmospheric solarization method needs several years or even more than ten years, and the formula can obtain the equivalent rust layer within 3 months;
(3) the invention adopts a single solution, does not need to be mixed for use, has the concentration close to the normal content of industrial atmosphere, does not cause serious pollution to the surrounding environment and reduces the pollution to the environment.
In conclusion, the invention has the advantages of simple construction, short construction period, reduction of environmental pollution and the like, and has high practical value and popularization value in the technical field of metal materials.
Detailed Description
To further clarify the objects, technical solutions and advantages of the present application, the present invention will be further described with reference to the following examples, which include, but are not limited to, the following examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
In this example, 6 pieces of weathering steel of 200 × 70 × 16mm size, model Q345qDNH, were used. All rust removal is carried out, the rust removal grade is ST3, the surface is free of rust, the rust removal is carried out by using an organic solvent, the surface is scrubbed by using absorbent cotton, and the rust removal is dried by using a blower;
preparing 1000 ml of required solution according to the proportion; wherein the concentration of the hydrochloric acid solution is 4 x 10-4mol/L, concentration of sulfuric acid solution is 1.72 x 10-2mol/L；
The prepared solution is put into a watering can, and the two solutions are used independently without mixing. Then uniformly spraying the paint on the surface of a weather-resistant steel matrix for 4 times a day, spraying 380 ml/square meter every time, ensuring that the surface of a test piece is dry when spraying every time, and continuously spraying for 90 days.
The observation verifies the compactness of the rust layer:
and observing and analyzing the plane appearance of the rust layer, the section appearance of the compact layer and alloy elements by an EDS (electronic discharge machining) method after 90 days. Principle explanation: containing Cl-Or SO4 -2The aqueous solution of (A) has strong oxidizability, and Fe is generated under the high-humidity environment3O4Oxidized into gamma-FeOOH, and the gamma-FeOOH can further undergo redox reaction to generate alpha-FeOOH and the like. And alpha-FeOOH is relatively stable and will not be further oxidized. The steel plate exposed to the sun in the natural environment can be dried quickly, and oxygen can more easily permeate into the rust layer and Fe in the dry environment2+The FeOOH is oxidized into amorphous FeOOH, and the amorphous FeOOH is converted into crystalline FeOOH through loss of water and crystallization, researches show that the FeOOH has cation selectivity, alloy elements such as Cr, Cu and the like replace the positions of various compounds Fe in the rust in an oxidation-reduction reaction to cause the enrichment phenomenon of the elements, and the elements such as Cr, Cu and the like block Cl-And SO4 -2The intrusion of ions, in turn, protects the substrate. In addition to the chemical solution action, how to frequently carry out the dry-wet circulation step is also a key technology in the invention. The steel plate rust layer disclosed by the invention is observed by EDS (electronic data system) to find that the outer rust layer is loose in structure and the inner layer is compact in structure; through Raman spectrum observation, the outer layer is mainly gamma-FeOOH, and the inner layer is mainly alpha-FeOOH. The process is proved to accelerate the formation of the stable rust layer and ensure the weather resistance of the weathering steel. The thickness of the whole rust layer is about 65 microns, and the mechanical property of the weathering steel with the thickness of 16mm is not influenced.
The surface treatment process of the weathering steel is as follows:
the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the scope of the present invention, but all the modifications made by the principles of the present invention and the non-inventive efforts based on the above-mentioned embodiments shall fall within the scope of the present invention.
Claims (2)
1. The liquid for accelerating the formation of the rust layer on the bridge weathering steel is characterized by comprising the liquid which is independently sprayed on the bridge weathering steel and has the concentration of 4 to 10-4The concentration of the hydrochloric acid solution (or) is 1.72 x 10-2A sulfuric acid solution of mol/L.
2. The process for construction of corrosion protection by using the liquid formed by the bridge weathering steel of claim 1, characterized by comprising the following steps:
step S1, derusting the bridge weathering steel at the outdoor normal temperature and with the relative air humidity of 5-50%, wherein the derusting grade is ST 3;
step S2, preparing with 90% hydrochloric acid and distilled water to obtain a solution with a concentration of 4 x 10-4A mol/L hydrochloric acid solution for standby; (or) preparing with 70% sulphuric acid and distilled water to obtain a concentration of 1.72 x 10-2A sulfuric acid solution of mol/L for standby;
step S3, spraying the solution with the concentration of 4 x 10 according to the dosage of 380 ml/square meter-4The concentration of the hydrochloric acid solution is 1.72 to 10 mol/L when the surface of the bridge weathering steel is dried (or) according to the dosage of 380 ml/square meter-2The sulfuric acid solution of mol/L waits for the surface of the bridge weathering steel to be dried;
step S4, repeating step S3 four times a day;
and step S5, repeating the step S4 ninety times to obtain the bridge weathering steel accelerated rust layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311276.3A CN112501600A (en) | 2020-11-20 | 2020-11-20 | Liquid for accelerating formation of rust layer of bridge weathering steel and anticorrosion construction process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311276.3A CN112501600A (en) | 2020-11-20 | 2020-11-20 | Liquid for accelerating formation of rust layer of bridge weathering steel and anticorrosion construction process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112501600A true CN112501600A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011311276.3A Pending CN112501600A (en) | 2020-11-20 | 2020-11-20 | Liquid for accelerating formation of rust layer of bridge weathering steel and anticorrosion construction process thereof |
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| Country | Link |
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| CN (1) | CN112501600A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002126636A (en) * | 2000-10-23 | 2002-05-08 | Sumitomo Metal Ind Ltd | Weather resistant surface-treated steel material and treatment method |
| CN108754474A (en) * | 2018-06-22 | 2018-11-06 | 燕山大学 | A kind of stabilized treatment fluid of acceleration weathering steel rusty scale |
-
2020
- 2020-11-20 CN CN202011311276.3A patent/CN112501600A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002126636A (en) * | 2000-10-23 | 2002-05-08 | Sumitomo Metal Ind Ltd | Weather resistant surface-treated steel material and treatment method |
| CN108754474A (en) * | 2018-06-22 | 2018-11-06 | 燕山大学 | A kind of stabilized treatment fluid of acceleration weathering steel rusty scale |
Non-Patent Citations (2)
| Title |
|---|
| 朱思远 等: "某耐候钢桥锈层稳定化处理技术的探索", 《材料保护》 * |
| 高立军 等: "耐候钢表面锈层稳定化处理技术研究", 《表面技术》 * |
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Application publication date: 20210316 |