CN-117228997-B - Alkali-activated gel material for anode coating and preparation method thereof

CN117228997BCN 117228997 BCN117228997 BCN 117228997BCN-117228997-B

Abstract

The invention discloses an alkali-activated gel material for anode cladding and a preparation method thereof, belonging to the technical field of constructional engineering. The invention adopts lithium hydroxide or the mixture of lithium hydroxide and sodium hydroxide to prepare the alkali-activated agent solvent, and the prepared alkali-activated gel material for anode coating has the characteristics of moderate setting time, good conductivity, stable strength, high anode current efficiency after coating and the like, can be used as a conductive medium, and can meet the market demand for the sacrificial anode protection of building reinforcing steel bars by adding specific zinc powder materials.

Inventors

CHEN DONGXU
LI CHENYANG
WEN JUNGUO
MA ZHIXIN
ZOU HONGHUI
CHEN SONG

Assignees

有研金属复材(忻州)有限公司

Dates

Publication Date: 20260512
Application Date: 20230620

Claims (6)

1. The preparation method of the alkali-activated gel material for anode coating comprises the following steps: 1) Preparing an exciting agent solution, namely, keeping stand for 20-30 hours for later use, wherein the content of lithium hydroxide hydrate in the exciting agent solution is 1-10% by mass fraction; 2) Uniformly stirring solid materials, wherein the solid materials comprise mineral powder, fly ash and aggregate; 3) Adding zinc powder into the exciting agent solution before use, and then slowly adding the exciting agent solution into the solid material and stirring to obtain a gel material, wherein in the step 3), the adding amount of the zinc powder is 5-10wt% of the exciting agent solution; the granularity range of the zinc powder is 10-40 meshes.
2. The preparation method according to claim 1, wherein in the step 3), the content of the activator solution in the gel material is 5wt% to 10wt%.
3. The preparation method according to claim 1 or 2, wherein the activator solution further contains sodium hydroxide, and wherein the content of sodium hydroxide in the activator solution is 0.1wt% to 5wt%.
4. The preparation method of claim 1, wherein in the step 3), the content of mineral powder in the gel material is 35-40 wt%, the content of fly ash is 30-35 wt%, and the content of aggregate is 15-20 wt%.
5. An alkali-activated gel material prepared by the preparation method of any one of claims 1 to 4.
6. Use of the alkali-activated gel material of claim 5 in anode coating.

Description

Alkali-activated gel material for anode coating and preparation method thereof Technical Field The invention belongs to the technical field of constructional engineering, and particularly relates to an alkali-activated gel material for anode coating and a preparation method thereof. Background In the construction engineering, the reinforced concrete structure is a main mode of building construction, and the corrosion of the reinforced bars has great influence on the service life and the safety of road and bridge and the construction engineering. Aluminum and zinc anodes are commonly packaged for such engineering to perform sacrificial anode protection on the steel bar structure. In the protection process, the anode and the steel bar structure are required to be connected and have good electric conductivity, and the anode structure has certain deformation resistance. Alkali-activated gel on the market is generally used as an environment-friendly substitute material for cement at present, but the material has unstable strength, poor conductivity (generally more than 10kΩ & cm) and lower anode current efficiency (generally about 65%) after zinc anode coating. Therefore, it is needed to provide an alkali-activated gel material for anode material coating, which has both good mechanical properties and electrochemical properties. Disclosure of Invention In order to solve the above problems, the present invention provides a method for preparing an alkali-activated gel material for anode coating, comprising the steps of: 1) Preparing an exciting agent solution, namely, keeping stand for 20-30 hours for later use, wherein the content of lithium hydroxide hydrate in the exciting agent solution is 1-10% by mass fraction; 2) Pouring and uniformly stirring solid materials, wherein the solid materials comprise mineral powder, fly ash and aggregate; 3) Zinc powder is added into the exciting agent solution before use, and then the exciting agent solution is slowly added into the solid material and stirred, so that the gel material is obtained. In some preferred embodiments, in the step 3), the zinc powder is added in an amount of 5wt% to 10wt% of the activator solution. In some preferred embodiments, in the step 3), the zinc powder has a particle size ranging from 10 to 40 mesh. In some preferred embodiments, in step 3), the content of the activator solution in the gel material is 5wt% to 10wt%. In some preferred embodiments, the activator solution further contains sodium hydroxide, wherein the mass content of the sodium hydroxide in the activator solution is 0.1% -5%. In some preferred embodiments, in the step 3), the content of mineral powder in the gel material is 35-40 wt%, the content of fly ash is 30-35 wt%, and the content of aggregate is 15-20 wt%. The invention also provides the alkali-activated gel material prepared by the preparation method. In addition, the invention also provides application of the alkali-activated gel material in anode coating. The invention has the beneficial effects that: 1. The invention provides a conductive medium gel with stable strength for anode materials, which can be used for coating the anode materials, in particular to sacrificial anode protection of engineering construction reinforcing steel bar structures. 2. The invention adopts lithium hydroxide or the mixture of lithium hydroxide and sodium hydroxide to prepare the alkali-exciting agent solvent, and can improve the strength stability, mechanical property and conductivity of gel by adding specific zinc powder materials, thereby stably protecting structural members to be protected. 3. The alkali-activated gel is used for coating anode materials, has the compressive strength of 75-90 MPa and the resistivity of about 100 omega cm, has the zinc-coated anode current efficiency of more than 85%, can serve as a conductive medium to ensure the protection of the anode to the steel bar structural member, and can also perform coating protection on the anode, so that the self-corrosion speed of the anode is prevented from being too high, and the service time is shortened. 4. The alkali-activated gel material for anode coating has the characteristics of moderate setting time, good conductivity, stable strength, high anode current efficiency after coating and the like, can be used as a conductive medium, and can meet the requirements of the market for sacrificial anode protection of construction steel bars. Detailed Description The invention is described in further detail below in connection with specific examples: example 1: 1) Preparing an exciting agent solution, namely, preparing the exciting agent solution containing 5% of lithium hydroxide hydrate and 3% of sodium hydroxide by mass fraction, and standing for 24 hours for later use; 2) Pouring and uniformly stirring solid materials, wherein the solid materials comprise mineral powder, fly ash and aggregate; 3) Adding high-purity zinc powder with the granularity range of 10-40 meshes int