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Accelerated Corrosion, CorrosionCell setup, Corrosion Engineering,…
Accelerated Corrosion
Paper: Effect of pH on Oxygen Corrosion At Elevated Pressures
PH
Temperature
Oxygen
linear
chloride
https://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/#1
10.92 mg/L
at sea level
1 atm
fresh water
saltwater holds about 20% less dissolved oxygen than freshwater
Sodium Bisulfate
https://www.walmart.com/ip/Leisure-Pool-pH-Decreaser-Sodium-Bisulfate-50-lb-Pail/769885746
dissolved oxygen in water enough for steel need to be calculated???
CorrosionCell setup
introduction
steel culverts' main deterioration mechanisms
abrasion
cause greater deterioration when acts with
corrosion
mechanism
a cathode
an electrolyte
an anode
assessment problem
using visual inspection
inspection variability
inaccurate assessment
how to use data to decide remaning strength
numerical analysis
ciritcal requirement
thickness of steel pipes
background
Faraday's Law
Corrosion Engineering
https://app.knovel.com/kn/resources/kpCE00004B/toc?issue_id=kpCE00004B
cspiTECOne_121.pdf
Performance Guideline for Corrugated Steel Pipe Culverts
corrositivity
water tests
resisitivity
TDS (Total Dissolved Solids) increase
R decrease
C increase
hardness
calcium carbonate (CaCO3) ion
CaCO3 increase
R decrease
Chlorides (Cl)
PH
abrasion condition
Use Design Charts – Match DSL to EMSL
only
depend on
PH
resisitivity
CSP material selection can be
further
checked
PH
resisitivity
hardness
Cl
Many studies have been performed in North America to better understand and quantify the durability performance of
CSP. These are discussed in “
The Handbook of Steel Drainage and Highway Construction Products
” and at www.cspi.ca.
ncspa_invertabrasion.pdf
based upon the Manning
equation
18-inch CSP will attain a velocity about 11 feet per second
with the pipe being half full,
if the pipe slope is about 12°