1. Start with the material of the pipeline and strictly control the quality of raw materials.
Strictly enter the market for stainless steel pipe and stainless steel pipe fittings. To ensure that the material meets the requirements. In terms of material selection, both economical and functional considerations are considered. Under special operating conditions, austenitic stainless steel with high corrosion resistance, high nickel content, duplex stainless steel, titanium and titanium alloys, and glass steel can be considered.
2. Surface coating protection
At present, in view of the corrosion of stainless steel elbow pipes under the environment, in addition to the selection of materials with strong corrosion resistance, the corrosion resistance can also be improved by coating the surface of the stainless steel pipes. In view of the relatively smooth surface of the stainless steel pipe substrate and the poor adhesion of the conventional stainless steel reducer anti-corrosion coatings on its surface, an effective coating for the anti-corrosion of stainless steel in the marine environment has been developed-epoxy powder coating . The paint is a new type of paint which is completely free of solvent and sprayed into a film in powder form.
3. Electrochemical protection
The electrochemical protection methods are mainly provided with protector protection, cathodic protection and anode protection methods.
(1) The protector protection method refers to connecting the metal with lower electrode potential and the protected metal together to form a primary battery. The metal with the lower electrode potential is dissolved as the anode, and the protected metal is used as the cathode to avoid corrosion.
(2) The cathodic protection method refers to the addition of a DC power supply, connecting the protected metal to the negative electrode as the cathode, so that the potential of the protected stainless steel flange metal is adjusted negatively to enter the non-corrosive area of the E-pH diagram; connect the waste metal To the positive electrode, as the anode makes the waste metal corrode and protect the cathode.
(3) The anode protection method refers to the use of an external DC power supply to connect the protected metal to the anode as the anode. The electrode potential moves in the positive direction (ie, anode polarization) and enters the passivation area of the E-pH diagram to protect The metal is "passivated" and protected.
