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A surface modification method for improving the anti-corrosion ability of steel bars

A surface modification and anti-corrosion technology, which is applied in the direction of buildings, building components, building insulation materials, etc., can solve the problems of easy corrosion of steel bars, achieve the effects of avoiding corrosion, improving bearing capacity and safe service level, and enhancing isolation effect

Active Publication Date: 2019-11-05
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that steel bars in existing reinforced concrete structures are easily corroded during service, and to provide a surface modification method for improving the anti-corrosion ability of steel bars, which can be used to prepare and produce Steel bars with high rust resistance

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0017] Specific implementation mode one: what this implementation mode records is a kind of surface modification method that improves steel bar anticorrosion ability, and the concrete steps of described method are as follows:

[0018] Step 1: Clean the steel bar surface with ethanol, and then dry it for later use;

[0019] Step 2: Preparation of nano-silica modifier: Take equal volumes of ethanol and water as solvents, weigh 1% deionized surfactant cetyltrimethylammonium bromide (CTAB) and add Add tetraethyl orthosilicate (TEOS) with a solvent mass fraction of 6-12% to obtain a nano-silica modifier;

[0020] Step 3: Surface modification of steel bars: place the steel bars in step 1 in the nano-silica modifier prepared in step 2, fully contact the steel bars with the nano-silica modifier, and apply an ultrasonic wave with a power of 10kHz~60kHz Place the probe in the nano-silica modifier, add ammonia water drop by drop to pH = 8~9 while ultrasonicating, react at 60~90°C for 2~...

specific Embodiment approach 2

[0021] Specific embodiment two: a kind of surface modification method that improves steel bar anticorrosion ability described in specific embodiment one, in step one, described reinforcing bar comprises the ribbed steel bar of various intensity grades and purposes and smooth steel bar, and reinforcing bar should be It is uncorroded.

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Abstract

The invention discloses a surface modification method for improving the rust protection capability of a steel bar and belongs to the technical field of building materials. The surface modification method comprises the following steps that the surface of the steel bar is cleaned up through ethyl alcohol and then dried for standby application; a nano silicon dioxide modifying agent is prepared, specifically, ethyl alcohol and water which are equal in volume are taken as a solvent, an appropriate amount of hexadecyl trimethyl ammonium bromide and tetraethoxysilane are added, and thus the nano silicon dioxide modifying agent is obtained; and the steel bar is placed in the nano silicon dioxide modifying agent, the steel bar and the nano silicon dioxide modifying agent make full contact, an ultrasonic probe with the power being 10 kHz-60 kHz is placed in the nano silicon dioxide modifying agent, ultrasonic treatment and dropwise adding of ammonia water are conducted simultaneously till the pH value is 8-9, reacting is conducted at the temperature of 60-90 DEG C for 2-6 h, the steel bar is taken out and washed through ethyl alcohol and then dried at the temperature of 105 DEG C for 1-2 h,and thus surface modification to the steel bar is completed. The nano SiO2 modifying agent is simple in preparation process, high in preparation speed and convenient to use, and the surface modification method is suitable for surface modification of various steel bars and suitable for large-scale batch production and actual engineering application.

Description

technical field [0001] The invention belongs to the technical field of steel bar antirust, and in particular relates to a surface modification method for improving the antirust ability of steel bars. Background technique [0002] According to the statistics of the World Corrosion Organization (WCO), the annual economic loss caused by the corrosion of steel bars in the world exceeds 2.2 trillion US dollars. Reinforced concrete structure is the most important structural form in the world at present and for a long time to come. The reinforced concrete structure comprehensively utilizes the advantages of concrete and steel for easy construction and concrete compression and steel tension, which greatly promotes the construction of contemporary civil engineering structures. It is widely used in various projects such as transportation, ports, houses, and nuclear power plants. The development provides an important foundation and support. On the other hand, there are many durabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/64C04B20/10
CPCC04B20/1066E04B1/642C04B14/34
Inventor 肖会刚刘敏
Owner HARBIN INST OF TECH
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