STABILIZATION TREATMENT LIQUID FOR 690 MPA-GRADE WEATHER-RESISTANT BRIDGE STEEL MEMBER, TREATMENT METHOD AND USE

Abstract

Disclosed is a stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member. The content in percentage by mass of each component of the stabilization treatment liquid is as follows: the content of ferric trichloride is 3-7%; the content of sodium bisulfite is 1-2%; the content of chromium sulfate is 3-6%; the content of potassium permanganate is 1-4%; the content of polypropylene glycol is 1-2%; the content of sodium carboxymethyl cellulose is 2-5%; and the remainder is deionized water. Also provided is a method for performing stabilization treatment by using the stabilization treatment liquid. According to the present invention, stabilization treatment for a rust layer of a 690 MPa-grade weather-resistant bridge steel member can be achieved, and after treatment, a brown rust layer having uniform color and no rust liquid flow is formed on the surface of the 690 MPa-grade weather-resistant bridge steel member.

Claims

1. A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member, wherein the stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member comprises a corrodent, a rust layer stabilizer, a humectant and a thickener; wherein the corrodent consists of ferric chloride and sodium bisulfate; the rust layer stabilizer consists of chromium sulfate and potassium permanganate; the humectant is polypropylene glycol; and the thickener is sodium carboxymethyl cellulose; the stabilization treatment liquid comprises by mass percentage: 3-7% ferric chloride; 1-2% sodium bisulfite; 3-6% chromium sulfate; 1-4% potassium permanganate; 1-2% polypropylene glycol; 2-5% sodium carboxymethyl cellulose; and a balance of deionized water.

2. The stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member according to claim 1, wherein the stabilization treatment liquid comprises by mass percentage: 4-5% ferric chloride; 1-2% sodium bisulfite; 4-5% chromium sulfate; 2-3% potassium permanganate; 1-2% polypropylene glycol; 2-4% sodium carboxymethyl cellulose; and a balance of deionized water.

3. The stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member according to claim 1, wherein the stabilization treatment liquid comprises by mass percentage: 4-5% ferric chloride; 1-1.5% sodium bisulfite; 4-5% chromium sulfate; 2-3% potassium permanganate; 1-1.5% polypropylene glycol; 2-3% sodium carboxymethyl cellulose; and a balance of deionized water.

4. A method for stabilization treatment of a 690 MPa-grade weather-resistant bridge steel member, wherein the method comprises the following steps: (1) Formulating a treatment liquid based on mass percentage according to a formula of the stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member according to claim 1, and agitating it thoroughly at an agitating speed of no more than 500 rpm; (2) Sandblasting a surface of the weather-resistant bridge steel member to a surface grade of SA2; (3) Using a spraying device to evenly spray the treatment liquid onto a side surface, a top surface, and a bottom surface of the member; (4) Removing accumulated fluid present on the top surface and the bottom surface; (5) Drying the member fully in flowing air, so as to form a brown rust layer with uniform color and no rusty liquid flowing on the surface of the 690 MPa-grade weather-resistant bridge steel member.

5. The method according to claim 4, wherein the agitation in step (1) is performed using an agitator, and the agitating speed is set to 300-500 rpm.

6. The method according to claim 4, wherein the treatment liquid is agitated for 1-2 hours in step (1).

7. The method according to claim 4, wherein the treatment liquid is used in an amount of 1-2 L/m.sup.2 in step (3).

8. The method according to claim 4, wherein a roller brush is used to remove the accumulated liquid in step (4).

9. The method for treating a 690 MPa-grade weather-resistant bridge steel member with a stabilization treatment liquid according to claim 4, wherein the drying in flowing air in step (5) continues for a period of time of 15 days.

10. The method according to claim 4, wherein the drying in flowing air in step (5) continues for a period of time of 15-30 days.

11. The method according to claim 4, wherein the drying in flowing air in step (5) is carried out outdoors.

12. (canceled)

13. The method according to claim 4, wherein the stabilization treatment liquid comprises by mass percentage: 4-5% ferric chloride, 1-2% sodium bisulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-2% polypropylene glycol, 2-4% sodium carboxymethyl cellulose, and a balance of deionized water.

14. The method according to claim 4, wherein the stabilization treatment liquid comprises by mass percentage: 4-5% ferric chloride, 1-1.5% sodium bisulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-1.5% polypropylene glycol, 2-3% sodium carboxymethyl cellulose, and a balance of deionized water.

15. The method according to claim 4, wherein the rust layer has the following technical parameters: (1) a thickness of the rust layer on the member surface 80 m; (2) a color difference value E of the rust layer on the surface at different locations of the member 10; (3) an amount of the rust layer on the member surface 25 g/m.sup.2.

Description

DETAILED DESCRIPTION

[0056] To better explain the present disclosure, the stabilization treatment liquid and treatment method for a 690 MPa-grade weather-resistant bridge steel member will be described in detail below with reference to the specific Examples.

[0057] The parameters in the Examples were tested according to the following methods:

[0058] Measurement of the rust layer thickness: A coating thickness gauge was used to measure the rust layer thickness of a weather-resistant bridge steel member. An area of less than 0.01 m.sup.2 was selected from the part to be tested, 10 points were selected in this area to measure the rust layer thickness, and the average rust layer thickness of the test points was calculated.

[0059] Measurement of the color difference value E of the rust layer on the surface at different locations of a member: A colorimeter was used to detect the color uniformity of the rust layer of a weather-resistant bridge steel member. The rust layer at a point of the part to be tested was selected as a standard sample. The color difference values AEs of the rust layer at 10 points of the member were measured. The average color difference value E of the test points was calculated.

[0060] Measurement of the amount of the rust layer on the surface of a member: A weight loss method was used to measure the amount of the rust layer on the surface of a member. When processing a member, 3-5 test pieces were processed simultaneously. The length, width, height and weight W1 of a test piece were measured, and the surface area S was calculated. The test piece was pickled to remove the rust, and the weight W2 after pickling was weighed.

[0061] The amount of the rust layer on the surface of a member=(W1W2)/S.

EXAMPLE I

[0062] A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member was formulated based on mass percentage. The components were weighed according to the following mass percentage contents: 3% ferric chloride, 1% sodium bisulfite, 3% chromium sulfate, 1% potassium permanganate, 1% polypropylene glycol, 2% sodium carboxymethyl cellulose, and a balance of deionized water. The treatment liquid was agitated for 1 hour using an agitator set at an agitating speed of 300 rpm. The surface of the weather-resistant bridge steel member was sandblasted to a surface grade of Sa2. A spraying device was used to evenly spray the treatment liquid onto the side surface, top surface, bottom surface and other parts of the member. The amount of the treatment liquid used was 1.8 L/m.sup.2. A roller brush was used to remove the accumulated liquid present on the top surface, bottom surface and other parts. The member was placed outdoors for 15 days to dry in flowing air. After the treatment, a brown rust layer with uniform color and no rusty liquid flowing was formed on the surface of the 690 MPa-grade weather-resistant bridge steel member. The thickness of the rust layer on the surface of the member was 85 m, the color difference value E of the rust layer on the surface at different locations of the member was 9, and the amount of the rust layer on the surface of the member was 28 g/m.sup.2.

EXAMPLE II

[0063] A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member was formulated based on mass percentage. The components were weighed according to the following mass percentage contents: 4% ferric chloride, 1.5% sodium bisulfite, 4% chromium sulfate, 2% potassium permanganate, 2% polypropylene glycol, 3% sodium carboxymethyl cellulose, and a balance of deionized water. The treatment liquid was agitated for 2 hours using an agitator set at an agitating speed of 400 rpm. The surface of the weather-resistant bridge steel member was sandblasted to a surface grade of Sa2. A spraying device was used to evenly spray the treatment liquid onto the side surface, top surface, bottom surface and other parts of the member. The amount of the treatment liquid used was 1.5 L/m.sup.2. A roller brush was used to remove the accumulated liquid present on the top surface, bottom surface and other parts. The member was placed outdoors for 30 days to dry in flowing air. After the treatment, a brown rust layer with uniform color and no rusty liquid flowing was formed on the surface of the 690 MPa-grade weather-resistant bridge steel member. The thickness of the rust layer on the surface of the member was 90 m, the color difference value E of the rust layer on the surface at different locations of the member was 5, and the amount of the rust layer on the surface of the member was 30 g/m.sup.2.

EXAMPLE III

[0064] A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member was formulated based on mass percentage. The components were weighed according to the following mass percentage contents: 7% ferric chloride, 2% sodium bisulfite, 6% chromium sulfate, 4% potassium permanganate, 2% polypropylene glycol, 5% sodium carboxymethyl cellulose, and a balance of deionized water. The treatment liquid was agitated for 2 hours using an agitator set at an agitating speed of 500 rpm. The surface of the weather-resistant bridge steel member was sandblasted to a surface grade of Sa2. A spraying device was used to evenly spray the treatment liquid onto the side surface, top surface, bottom surface and other parts of the member. The amount of the treatment liquid used was 1 L/m.sup.2. A roller brush was used to remove the accumulated liquid present on the top surface, bottom surface and other parts. The member was placed outdoors for 28 days to dry in flowing air. After the treatment, a brown rust layer with uniform color and no rusty liquid flowing was formed on the surface of the 690 MPa-grade weather-resistant bridge steel member. The thickness of the rust layer on the surface of the member was 88 um, the color difference value E of the rust layer on the surface at different locations of the member was 6, and the amount of the rust layer on the surface of the member was 32 g/m.sup.2.

EXAMPLE IV

[0065] A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member was formulated based on mass percentage. The components were weighed according to the following mass percentage contents: 6% ferric chloride, 1.6% sodium bisulfite, 5.5% chromium sulfate, 3.5% potassium permanganate, 1.5% polypropylene glycol, 3.5% sodium carboxymethyl cellulose, and a balance of deionized water. The treatment liquid was agitated for 1.5 hours using an agitator set at an agitating speed of 350 rpm. The surface of the weather-resistant bridge steel member was sandblasted to a surface grade of Sa2. A spraying device was used to evenly spray the treatment liquid onto the side surface, top surface, bottom surface and other parts of the member. The amount of the treatment liquid used was 1.2 L/m.sup.2. A roller brush was used to remove the accumulated liquid present on the top surface, bottom surface and other parts. The member was placed outdoors for 25 days to dry in flowing air. After the treatment, a brown rust layer with uniform color and no rusty liquid flowing was formed on the surface of the 690 MPa-grade weather-resistant bridge steel member. The thickness of the rust layer on the surface of the member was 88 m, the color difference value E of the rust layer on the surface at different locations of the member was 7, and the amount of the rust layer on the surface of the member was 29 g/m.sup.2.

EXAMPLE V

[0066] A stabilization treatment liquid for a 690 MPa-grade weather-resistant bridge steel member was formulated based on mass percentage. The components were weighed according to the following mass percentage contents: 4.5% ferric chloride, 1.9% sodium bisulfite, 4.5% chromium sulfate, 2.5% potassium permanganate, 1.7% polypropylene glycol, 3.8% sodium carboxymethyl cellulose, and a balance of deionized water. The treatment liquid was agitated for 1.6 hours using an agitator set at an agitating speed of 440 rpm. The surface of the weather-resistant bridge steel member was sandblasted to a surface grade of Sa2. A spraying device was used to evenly spray the treatment liquid onto the side surface, top surface, bottom surface and other parts of the member. The amount of the treatment liquid used was 2 L/m.sup.2. A roller brush was used to remove the accumulated liquid present on the top surface, bottom surface and other parts. The member was placed outdoors for 29 days to dry in flowing air. After the treatment, a brown rust layer with uniform color and no rusty liquid flowing was formed on the surface of the 690 MPa-grade weather-resistant bridge steel member. The thickness of the rust layer on the surface of the member was 92 m, the color difference value E of the rust layer on the surface at different locations of the member was 4.5, and the amount of the rust layer on the surface of the member was 27 g/m.sup.2.

[0067] The above Examples are only some preferred illustrations and are not intended to limit the embodiments of the present disclosure.