Spiral steel pipe under the impact of high-speed fluid, the protective film damage, break at the bare metal accelerate corrosion. If the fluid contains solid particles, spiral steel pipe corrosion and wear is even more serious. Spiral steel pipe surface by high velocity impact and turbulence of the fluid-like, and to abrasion and corrosion damage, known corrosion and wear. Its exterior features are: localized grooves, corrugated, round and valleys shaped, usually show directionality. Exposed to the movement of fluid in equipment such as: pipes, tees, valves, blowers, centrifuges, impellers, heat exchangers, exhaust duct, etc. can have an impact corrosion. Soft metals such as copper and lead more serious.
You can choose to prevent the impact corrosion resistance, wear better materials, such as Alloy 20 is better than 18/8 stainless steel, 90Cu/10Ni superior 70Cu/30Ni (sea water), but also improve the design, changing the environment, or coating and cathodic protection. Impact corrosion occurred in parts of the fluid to change direction. Such as elbows, tees, cyclone separator, container and inlet tube relative to the site.
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