Inhibitors Flashcards
Scale formation over the entire surface. Most common types: Silicates Phosphates
Precipitation inducing Inhibitors
AKA Gunkers
Ohmic inhibitors
AKA volatile corrosion Inhibitors Inhibitors is vaporized into a gaseous form Inhibits corrosion by making the environment alkaline
Vapor Phase Inhibitors
Can reduce the effectiveness of inhibitors
Bicarbonates Metal cations
The corrosion Investigator’s first job on-site is to:
Protect all evidence
the Corrosion Investigator’s second job on-site is to:
Collect all evidence
The presence of water can be confirmed in a sample by using ….
Hydrion paper
Which gas analysis test cannot be collected with a stain tube?
Pressure
A procedure that penetrates and preserves the scale, corrosion product, microbes and deposits that are present on an internally corroded pipe is:
Embedment
The temperature of liquid samples is measured in the field using:
Common laboratory thermometer and with an electronic temperature probe.
The pH of aqueous samples is measured using:
pH Meter and pH Test Paper
These samples must be taken where there are differences in color, texture, density or composition of materials in the pipe
Solid/Sludge sampling
These samples are normally collected in stainless steel sample bottles or Tedlar bags. Stain tubes can sometimes be used to replace some samplings.
Gas Sampling
Collect at least 500ml in two 250 ml sample containers at the site of the cut if possible. Samples should be filled to the top to exclude air and capped.
Liquid Sampling
This sample should be cut using a portable band saw or wheel-type cutter to prevent torch cutting debris from entering the sample.
Pipe Sampling
Common technique used to identify crystalline phases in unknown materials. These crystalline phases are described as compounds rather than elements which is beneficial in understanding corrosion.
XRD - X-Ray Diffraction (XRD)