How to prevent corrosion of stainless steel hydraulic joints?

1. Starting from pipes, strict quality control of raw materials. Stainless steel pipes and stainless steel elbow fittings are strictly inspected at the entrance. How to ensure that the material prevents corrosion of stainless steel hydraulic joints? Conforms to the profile. In the selection of materials, the economy and functionality of the elbow joint were considered. Under special operating conditions, corrosion-resistant materials such as high-nickel austenitic stainless steels, duplex stainless steels, titanium and titanium alloys, and fiberglass-reinforced plastics may be considered. When selecting materials, appropriately increase the corrosion allowance of the pipeline and stainless steel tee to meet the service life requirements of the pipeline system. Stainless steel tube processing


2. Electrochemical protection. Electrochemical protection methods include protection devices, cathodic protection and anodic protection. The protection method is to electrically connect the metal and the lower electrode to the protected metal to form a primary battery. The metal with the lower electrode potential is dissolved into the anode and the protected metal is used as the cathode to prevent corrosion. The anode protection method is to use an external DC power supply to connect the protected metal to the positive pole, z being the anode. The electrode potential moves in the positive direction (i.e., anodic polarization) into the passivation region of the e-ph diagram, thereby "passivating" and protecting the protective metal that holds the Wing Han threaded collet.






3. Surface protection. At present, in view of the corrosion of stainless steel elbows in the environment, in addition to materials with strong corrosion resistance, the surface of stainless steel elbows can also be coated to improve the corrosion resistance of pipes. In order to solve the problem that the surface of the stainless steel pipe substrate is relatively smooth and the adhesion of the anti-corrosion coating of the conventional stainless steel reducing pipe is poor, an effective anti-corrosion coating for the stainless steel pipe in the marine environment, an epoxy powder coating, was developed. The paint is a new type of solvent-free paint sprayed in powder form on Yonghua stainless steel chuck.


4. Processing method of stainless steel pipe fittings:
Roller method: The core is placed in the tube, and the circumference is pushed by the roller for processing round edges.
Rolling method: Generally, mandrel is not used, and it is suitable for inner round edge of thick-walled pipe. Bulk pressure is used to drum the tube into the desired shape. This method is used in most bellows production.
Stamping method: On a stamping machine with a tapered core, expand the end of the tube to the desired size and shape.


5. Forging method: The end or part of the stainless steel pipe is stretched with a die forging machine to reduce the outer diameter.
Bending forming method: There are three commonly used bending forming methods, one is called the stretching method, the other is called the pressing method, the third is called the roller method, there are 3-4 rollers, two fixed rollers, one adjustment Rollers, adjust the distance between the fixed rollers, the finished tube is bent.