Control method to prevent crack corrosion of clamping pipe fittings

Control method to prevent crack corrosion of clamping pipe fittings

1. Try to avoid gaps in design and structure. For example, butt welding is used in place of riveting and bolting in the manufacturing process whenever possible. The flange gasket at the joint is made of a non-absorbable material, such as polytetrafluoroethylene.

2. Select suitable metal materials that are resistant to clamp pipe fitting crevice corrosion;

3. Clamp pipe fittings adopt electrochemical protection. If the cathode protection law is used, the cathode polarization of the stainless steel is lower than the protection potential φ, and higher than the Flade potential ρp region, it can not produce pitting, nor cause corrosion of the clamp pipe fitting gap. The key of cathodic protection is whether there is enough current to reach the seam to achieve the protection potential;

4. Clamp pipe fittings use corrosion inhibitors.

Control method to prevent crack corrosion of clamping pipe fittings

1. Try to avoid gaps in design and structure. For example, butt welding is used in place of riveting and bolting in the manufacturing process whenever possible. The flange gasket at the joint is made of a non-absorbable material, such as polytetrafluoroethylene.

2. Select suitable metal materials that are resistant to clamp pipe fitting crevice corrosion;

3. Clamp pipe fittings adopt electrochemical protection. If the cathode protection law is used, the cathode polarization of the stainless steel is lower than the protection potential φ, and higher than the Flade potential ρp region, it can not produce pitting, nor cause corrosion of the clamp pipe fitting gap. The key of cathodic protection is whether there is enough current to reach the seam to achieve the protection potential;

4. Clamp pipe fittings use corrosion inhibitors.