Corrosion tests applied to metals Flashcards
(23 cards)
this is used to measure the permeation rate of atomic hydrogen associated with hydrogen induces cracking (HIC)
Hydrogen probe
Internal cracks that connect adjacent hydrogen blisters on different planes in the metal, or to the metal surface.
HIC
This is placed either in or on the outside walls of a vessel or piping. It works by measuring the amount of hydrogen that has been diffused into the metal surface. Either intrusive or non intrusive.
Hydrogen Probe
Finds out if the inhibitor is dividing inside the system into the different phases.
Partition testing
uses high frequency sound energy to conduct examinations and make measurements. sound energy is introduced and propagates through the materials in the form of waves.
Ultrasonic testing
uses magnetic field to determine if equipment has cracking from stress or corrodents. Microscopic particles sprayed, magnetic force applied, particles flow and settle into any imperfection.
magnetic particle testing
sample is drawn and injected into test vials. color change indicates presence, positive test does not indicate act MIC only more testing needed.
Bacteria Test
autonomous devices sent and retrieved fro a pipe, propelled by product. an ILI (inline inspection) has odometer, calipers for roundness, tilt sensors, capacitive sensors, ultrasonics
Smart Pigging
detects surface and near surface irregularities. don’t need to remove any surface paint. uses and electric field.
Eddy Current Testing
analyze emitted sound waves caused by defects or discontinuities. between 100 kHz and 1 MHz. only gives estimate of damage.
Acoustic emission testing
It is a Nondestructive Test method (NDT) that is based on the high frequency sound generated by cracks and similar flaws in materials when stressed. uses a low-noise amplifier
Acoustic Emission Test
measures a change in polarization as light reflects or transmits from a material structure. used to determine film thickness.
Ellipsometry
“on-line” method of monitoring corrosion rates of a metal using two metals. the probes measure electrical resistance of the exposed metal in reference to the encased metal.
electrical resistance probes
gas is dissolved in the oil. use gas sparging test, take sample add filler induce foaming , time with stopwatch.
extract sample, machine uses centrifugal force to separate all constituents. tests just after separators or at where product exits.
Foaming and Emulsions testing
x-ray
radiographic test
optical instrument for inspection of inaccessible places
borescope
used to determine the effectiveness of a protective film created by corrosion inhibitor. the minimum concentration of inhibitor needed to form a protective film is determined. dip coupon in NaCl for five min, than dip into inhibitor, than dip into CuSO4
copper ion displacement test
used to measure how resilent an internal protective film is under certain corrosive environments. uses a wheel test
film persistency testing
separate organic and inorganic compounds. sample injected into machine travels down hollow tube via nitrogen or helium. detector measures light.
chromatographic analysis
thin membrane of cellulose fibers, filters different types of material. used mainly for water and oil
milipore filter analysis
molecule containing radioactive atom put in system and followed, as it corrodes radioactive atoms transported to surface.
tagged radioactive molecules
used in water injection systems to determine corrosion rates due to dissolved oxygen
probes determining the corrosivity of a fluid two dissimilar metals that exist in the pipeline are on the probe and placed in the stream like you would for one determining oxygen levels
galvanic probe
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water and gas analysis
