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.

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 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 μm; (2) a color difference value λE 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 2 .