Sour Under-Deposit Corrosion With Different Iron Sulfides

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Product Number: 51321-16703-SG

Author: J. Kvarekvål; M. Tjelta

Publication Date: 2021

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Under-deposit corrosion experiments were performed to study the corrosive effects of different
types/polymorphs of iron sulfides; Pyrite, pyrrhotite and a troilite/pyrrhotite mixture, which were all
commercially available, and mackinawite synthesized in-house by corrosion of steel
shavings. Prior to testing the commercial iron sulfides were ground in a ball mill under oxygenfree
atmosphere to ensure active particle surfaces. The H2S and CO2 partial pressures were 10
bar each, the temperature was 25 oC, and the test solutions consisted of high-salinity brine (100
g/L NaCl, 150 ppm bicarbonate). The duration of the tests was around 14 days. Both weight loss
corrosion and localized corrosion data were obtained. The entire surfaces of the exposed coupons
were scanned with a 3D profilometer, obtaining detailed data on localized corrosion morphology
and pit depths. The different iron sulfide deposits exhibited different effects on both weight loss
and localized corrosion. The experimental results, and various properties of iron sulfide deposits
affecting the corrosion behavior, are discussed on the background of available literature.