High salt content (
up to 3%)
in expansive soils accelerates casing corrosion.
Protective measures include:Буровая установка для бурения скважин на воду
-
Material upgrade:
Use 316L stainless steel casings with 5x better corrosion resistance than Q235 steel.
-
Coating protection:
Spray epoxy powder on inner walls (≥300μm thick), hot-dip galvanize outer walls (85μm zinc layer).
-
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
Буровая установка Bangxin