Features of SRB-Induced Corrosion of Carbon Steel in Marine Environments

2008 ◽  
pp. 270-270-14
Author(s):  
HA Videla ◽  
C Swords ◽  
RGJ Edyvean
Keyword(s):  
Carbon Steel ◽  
Marine Environments

Anaerobic Biodegradation of Alternative Fuels and Associated Biocorrosion of Carbon Steel in Marine Environments

2016 ◽  
Vol 50 (9) ◽  
pp. 4844-4853 ◽  
Author(s):  
Renxing Liang ◽  
Deniz F. Aktas ◽  
Egemen Aydin ◽  
Vincent Bonifay ◽  
Jan Sunner ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Alternative Fuels ◽  
Anaerobic Biodegradation ◽  
Marine Environments

scholarly journals Study of the Fe(II-III) hydroxysalts transformation according to the pH and the concentration of the ions present

2018 ◽  
Vol 7 (5) ◽  
pp. 359-369
Author(s):  
Farida Termemil ◽  
Marwa Ahmed-Malek ◽  
Assia Bourouba ◽  
Mohamed-rida Benloucif
Keyword(s):  
Carbon Steel ◽  
Cathodic Protection ◽  
Iron Hydroxide ◽  
Green Rust ◽  
Corrosion Products ◽  
Water Molecules ◽  
Marine Environments ◽  
Sulphate Reducing Bacteria ◽  
Reducing Bacteria ◽  
Ordinary Steel

Sulphated green rust, GR (SO4 2- ), is one of the main corrosion products of carbon steel in marine environments. It is Fe (II)-Fe(III) hydroxylsalt in sheets, consisting of alternating layers of iron-hydroxide type Fe(OH)2 , loaded positively due to the presence of the cations Fe(III) and negative interlayers consisting of anions and water molecules. This compound is strongly associated with the metabolism of sulphate-reducing bacteria, and can also evolve under cathodic protection. Thus, recently, GR (CO3 2- ) has been detected in place of GR (SO4 2- ) on already corroded ordinary steel, newly subjected to cathodic protection. This presence is due to the pH and[SO4 2−] [HCO3 − ⁄ ] conditions imposed by the cathodic protection. In this paper, we chemically synthesize sulfated and carbonate green rust in a chlorinated medium; we then study their respective transformation according to the concentration [SO4 2- ] / [HCO3 - ] ratio and pH. Our results show that from a GR (SO4 2- ), GR (CO3 2- ) is formed from a pH ≥8.2 for [SO4 2- ] / [HCO3 - ] = 12 and without any change in pH for [SO4 2- ] / [HCO3 - ] <12. Whereas from GR (CO3 2- ), GR (SO4 2- ) is formed for [SO4 2- ] / [HCO3 - ] > 1 without any change in pH.

Tropical/non-tropical marine environments impact on the behaviour of carbon steel and galvanised steel

2017 ◽  
Vol 69 (5) ◽  
pp. 614-625 ◽  
Author(s):  
Rosa Vera ◽  
Oladis Troconis de Rincón ◽  
Margarita Bagnara ◽  
Nathalie Romero ◽  
Raquel Araya ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Marine Environments ◽  
Galvanised Steel

scholarly journals Prediction of Thermal Spray Coatings Performance in Marine Environments by Combination of Laboratory and Field Tests

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 320
Author(s):  
Rosa Grinon-Echaniz ◽  
Shiladitya Paul ◽  
Rob Thornton ◽  
Philippe Refait ◽  
Marc Jeannin ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Aluminum Alloys ◽  
Corrosion Protection ◽  
Thermal Spray ◽  
Steel Substrate ◽  
Steel Structures ◽  
Thermal Spray Coatings ◽  
Marine Environments ◽  
Low Carbon ◽  
Spray Coatings

Cost-effective corrosion mitigation of offshore steel structures can be achieved by thermal spray coatings. These coatings, when comprised of Al, Zn and their alloys, provide a physical barrier against the environment when intact, and cathodic protection to underlying steel when damaged. Due to the complexity of marine environments, laboratory tests should be combined with field work in order to understand the corrosion protection offered by these coatings. The work presented here was carried out with thermal spray coatings of aluminum alloys (AA1050, AA1100, Al-5Mg) and Zn-15Al prepared by Twin Wire Arc Spray onto low carbon steel substrates. The resulting coatings were ~300 μm in thickness, and 5% of surface area defects were artificially machined in order to expose the steel substrate, simulating mechanical damage or erosion of the coating. Electrochemical data collected over a 90 days period showed a good correlation between laboratory and real marine environment results. Aluminum alloys showed better corrosion protection in fully immersed conditions, while zinc alloys performed better in atmospheric and splash zones. Overall, these results aim to improve design of thermal spray coatings to protect carbon steel in marine environments.

scholarly journals Corrosion Fatigue Numerical Model for Austenitic and Lean-Duplex Stainless-Steel Rebars Exposed to Marine Environments

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1217 ◽  
Author(s):  
Iñigo Calderón-Uríszar-Aldaca ◽  
Estibaliz Briz ◽  
Amaia Matanza ◽  
Ulises Martin ◽  
David M. Bastidas
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Numerical Model ◽  
Corrosion Fatigue ◽  
Performance Indicator ◽  
Performance Ratio ◽  
Semiempirical Model ◽  
Marine Environments ◽  
Deterioration Process ◽  
Steel Rebars

Steel rebars of structures exposed to cyclic loadings and marine environments suffer an accelerated deterioration process by corrosion fatigue, causing catastrophic failure before service life ends. Hence, stainless steel rebars have been emerging as a way of mitigating pitting corrosion contribution to fatigue, despite the increased cost. The present study proposes a corrosion fatigue semiempirical model. Different samples of rebars made of carbon steel, 304L austenitic (ASS), 316L ASS, 2205 duplex (DSS), 2304 lean duplex stainless steels (LDSS), and 2001 LDSS have been embedded in concrete and exposed to a tidal marine environment for 6 months. Corrosion rates of each steel rebar have been obtained from direct measurement and, considering rebar standard requirements for fatigue and fracture mechanics, an iterative numerical model has been developed to derive the cycles to failure for each stress range level. The model resulted in a corrosion pushing factor for each material, able to be used as an accelerating coefficient for the Palmgren-Miner linear rule and as a performance indicator. Carbon steel showed the worst performance, while 2001 LDSS performed 1.5 times better with the best cost-performance ratio, and finally 2205 DSS performed 1.5 times better than 2001 LDSS.

Galvanic corrosion in marine environments: Effects associated with the inversion of polarity of Zn/carbon steel couples

2018 ◽  
Vol 70 (6) ◽  
pp. 950-961
Author(s):  
Philippe Refait ◽  
Marc Jeannin ◽  
Emilie François ◽  
René Sabot ◽  
Anne‐Marie Grolleau
Keyword(s):  
Carbon Steel ◽  
Galvanic Corrosion ◽  
Marine Environments
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