Spiral steel surface by high velocity and turbulence of the fluid-like impact, along with wear and corrosion damage was known corrosion and wear.
Impact Corrosion and wear is the primary form of corrosion. Spiral pipe fluid at high speed impact, protective film damage, break at the bare metal accelerate corrosion. If the fluid contains solid particles, spiral pipe corrosion and wear even more grim.
Its surface is characterized by: Locality grooves, ripples, round-shaped valley and generally show directivity. Exposed to the fluid movement of equipment such as: tees, valves, blowers, centrifuges, impellers, heat exchangers, exhaust duct, ect. can impact the onset of corrosion. Soft metals such as copper and lead more severe.