Equilibrium expressions related to the solubility of the sour corrosion product mackinawite
Modification of Mackinawite
with L-Cysteine: Synthesis, Characterization, and Implications to Mercury Immobilization in Sediment.
When exposed to sulphur species in bio-environments, iron and steel first develop a poorly protective film of mackinawite
(an iron sulfide rich in iron) that changes later, to a more stable iron sulfides through different chemical and electrochemical paths.
2]S-free) corrosion rate by 3-10 times due to formation of a thin mackinawite
Lennie AR, Redfern SAT, Champness PE, Stoddart CP, Schofield PF, Vanghan DJ (1997) Transformation of mackinawite
to greigite: An in-situ -ray powder diffraction and transmission electron microscope study.
Where the dominant contaminant is iron sulfide in the mackinawite
or troilite form, a noticeable reddish color will occur in treated samples almost immediately.
In the presence of sulfur species (either biogenic or abiotic) carbon steel firstly develop a film of mackinawite
that later changes through several chemical and electrochemical paths to more stable iron sulfides  In all cases iron sulfides are characterized by strong cathodic effects on the hydrogen reduction reaction, causing an indirect increase in the corrosion rate.
The sulfur released by pyrite decomposition and the free CaO released from partial pyrolysis of calcium carbonate react and form a CaS-type phase, whereas the uncompleted decomposition process of pyrite may produce mackinawite
[FeS] type phases.
The AVS method of Bush and Sullivan (1998) uses 12 M HCI and extracts monosulfides including amorphous FeS, mackinawite
, and greigite.
amorphous sulfides, mackinawite
, and greigite ([Fe.