Introduction of environmental factors affecting crack corrosion of jammed pipe fittings

Several factors that affect the clearance corrosion of clamping pipe fittings: When the clearance is 0.10 to 0.12 mm, the corrosion depth is maximum. If the gap is greater than 0.25 mm, no gap corrosion will be caused to the compression pipe joint. In addition, the corrosion rate in the gap increases with the increase of the area outside the gap.

Environmental factors affecting crack corrosion of jammed pipe fittings:

1, temperature effect: Generally speaking, as the temperature increases, the anode reaction accelerates, the corrosion rate increases, and it is more likely to cause the gap corrosion of the compression pipe fittings.

2, oxygen concentration effect: the oxygen concentration in the solution increases, the oxygen outside the gap is easier to reduce at the cathode, and accelerates the gap corrosion of the compression tube. If the dissolved oxygen is less than 0.5 ppm, it may not cause gap corrosion of the compression fittings.

3. Anion: Generally, the higher the concentration of CL, the higher the possibility of crevice corrosion. With the decrease of pH value and the increase of Cl concentration, the corrosion rate increases. In the presence of other halogen ions, they can cause gap corrosion in compressed pipe fittings, and their effect is weaker than that of Cl.