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Keywords: mackinawite
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Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-12866
... variation among the samples analyzed. The polymorphous iron sulfides include pyrrhotite, pyrite, marcasite, troilite, mackinawite and greigite, in the order of abundance. Ferric iron compounds, such as akaganeite, goethite, lepidocrocite, hematite and magnetite are also identified in some samples analyzed...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13425
.... But with an increase in temperature to 80°C, the measured reaction order of precipitation decreased to 1. In all conditions, the authors identified the corrosion product as mackinawite. An estimated activation energy of 40 kJ/mol was also suggested from the Harmandas et al.20 study. However, the results were obtained...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10984
... concentrations between 1 and 10 wt%. Even if, according to thermodynamic calculations, FeS Mackinawite was under-saturated in the bulk solution in marginally sour environments, the formation of an FeS Mackinawite layer was observed by scanning electron microscope (SEM) and Element Energy Dispersive...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10970
... rate decreased further for a short period due to precipitated mackinawite above the existing siderite. As H 2 S and brine were diffusing through the pore network in siderite, the corrosion rate exhibited an increasing trend due to the accelerating effect of the formed mackinawite within...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11027
... to a much faster kinetics of formation than iron sulfide (mackinawite). Magnetite is assumed to be responsible for the initial rapid decrease of the corrosion rate in this environment. In another experiment, the conversion of magnetite into mackinawite was investigated by exposing a preformed magnetite...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11090
... materials and corrosion Upstream Oil & Gas Publication Division Subsurface Corrosion mackinawite immersion time texas 77084 steel Pipeline Corrosion well integrity corrosion rate solid-state reaction sour corrosion manuscript Sulfide Houston permission initial stage...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10548
... that decreases the general corrosion rate; however, a trace amount of H 2 S may only lead to a partially protective mackinawite layer that could result in localized corrosion. In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO 2 and 15 × 10 -6...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10849
... flowline corrosion Production Chemistry Corrosion Management Pipeline Corrosion riser corrosion mackinawite steel texas 77084 Corrosion Inhibition oilfield chemistry H2S management Publication Division Houston hydrogen permeation hydrogen embrittlement sulphide film formation...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9319
... place at mackinawite (the most common low temperature polymorph of iron sulfide) electrodes in sour aqueous solutions have been studied using electrochemical techniques and the effect of mass transport was obtained using a jet impingement setup. The main objective was to obtain current-potential...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9363
... ABSTRACT The corrosion protection due to iron sulfide scales has been and continues to be a controversial issue in corrosion science. These scales are very important to understand the mechanism of sour corrosion. For instance, it is known that the point of zero charge (PZC) for mackinawite...
Proceedings Papers

Paper presented at the CORROSION 2016, March 6–10, 2016
Paper Number: NACE-2016-7623
... of X65 steel upon transition from pure sweet to sour conditions. Electrochemical testing indicated continuously increased general corrosion rates, which are mainly attributed to the rapid formation of mackinawite. Mackinawite further promoted the anodic dissolution of iron at the low temperature of 25°C...
Proceedings Papers

Paper presented at the CORROSION 2016, March 6–10, 2016
Paper Number: NACE-2016-7795
... were identified as Mackinawite, Troilite and Cubic iron sulfide. The proportion of these species changed with the nucleation potential. These findings indicate that at the most fundamental level, the FeS layer consist on a blend of different iron sulfide polymorphs rather than a pure iron sulfide form...
Proceedings Papers

Paper presented at the CORROSION 2015, March 15–19, 2015
Paper Number: NACE-2015-5507
... or stable corrosion products in sour environments at elevated temperature up to 250 0 C, which includes mackinawite (FeS), greigite (Fe 3 S 4 ), the pyrrhotite group (Fe1-xS, x = 0 to 0.17) and pyrite (FeS 2 ). The model is based on theoretical thermodynamic calculations and data collection from open...
Proceedings Papers

Paper presented at the CORROSION 2015, March 15–19, 2015
Paper Number: NACE-2015-5484
... materials and corrosion well integrity flowline corrosion subsurface corrosion chemistry concentration texas 77084 pipeline corrosion riser corrosion mackinawite steel co 2 permission artificial intelligence upstream oil & gas publication division carbon steel pyrrhotite...
Proceedings Papers

Paper presented at the CORROSION 2015, March 15–19, 2015
Paper Number: NACE-2015-5485
... & gas chemistry materials and corrosion well integrity concentration pyrrhotite mackinawite texas 77084 flowline corrosion subsurface corrosion fe 2 publication division sulfide manuscript corrosion product reaction solubility iron sulfide elemental sulfur metal surface permission...
Proceedings Papers

Paper presented at the CORROSION 2015, March 15–19, 2015
Paper Number: NACE-2015-5939
... in 3.5 wt.% NaCl solution in 9.5 MPa CO 2 and 0.5 MPa H 2 S at 40 0 C for 30 days. Microstructural characterization revealed that the coatings protected the steel substrate from CO 2 /H 2 S corrosion. The bare steel formed a mackinawite (FeS1-x) scale, while no such scale was seen in the case of CRA...
Proceedings Papers

Paper presented at the CORROSION 2015, March 15–19, 2015
Paper Number: NACE-2015-5909
... to hydrogen permeation increased as the temperature of wet gas increased. texas 77084 specimen publication division corrosion product hydrogen permeation different temperature hydrogen permeation current corrosion scale houston flowline corrosion mackinawite permission materials...
Proceedings Papers

Paper presented at the CORROSION 2014, March 9–13, 2014
Paper Number: NACE-2014-3807
... and steel temperature led to the formation of more coherent FeS layers that conferred a greater degree of protectiveness. The water condensation rate had a minimal effect on the corrosion rate. Mackinawite and cubic FeS were always identified at the top of the line for most of the tested conditions, while...
Proceedings Papers

Paper presented at the CORROSION 2014, March 9–13, 2014
Paper Number: NACE-2014-4326
... is essential in predicting corrosion rates and mitigating scale formation in sour environment. This paper presents a new approach wherein the nanocrystalline iron sulphide (mackinawite) scale formation is modeled by the nucleation and growth of the scale crystals. Ignoring any solid state reactions that could...
Proceedings Papers

Paper presented at the CORROSION 2013, March 17–21, 2013
Paper Number: NACE-2013-2462
... ) were reviewed here. By comparing with experimental data, the best prediction model for H 2 S solubility and dissociation in an H 2 S-H 2 O system was identified. Occurrence of iron sulfide polymorphs was experimentally investigated and it was found that, in short term exposures, mackinawite formed...

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