Casing Anti-corrosion Technologies in Expansive Soil Water Well Drilling

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High salt content (up to 3%) in expansive soils accelerates casing corrosion. Protective measures include:water well drilling rig

 

  1. Material upgrade:
    Use 316L stainless steel casings with 5x better corrosion resistance than Q235 steel.
  2. Coating protection:
    Spray epoxy powder on inner walls (≥300μm thick), hot-dip galvanize outer walls (85μm zinc layer).
  3. Cathodic protection:
    Install magnesium alloy sacrificial anodes (current output ≥1A) with -1.5V protection potential.

 

After application in a Xinjiang China project, casing lifespan extended from 5 to over 20 years.water well drilling rig