Protection of Steel Piles by Selected Coatings in a Natural Seawater Environment

1979 ◽  
Vol 31 (08) ◽  
pp. 1035-1041
Author(s):  
E. Escalante ◽  
W.P. Iverson
Keyword(s):  
Natural Seawater ◽  
Steel Piles ◽  
Seawater Environment

scholarly journals Corrosion and protection of steel piles in a natural seawater environment

1977 ◽  
Author(s):  
E Escalante ◽  
W P Iverson ◽  
W F Gerhold ◽  
B T Sanderson ◽  
R L Alumbaugh
Keyword(s):  
Natural Seawater ◽  
Steel Piles ◽  
Seawater Environment

Fatigue Performance of Copper Alloys in Seawater Environment

2013 ◽  
Vol 577-578 ◽  
pp. 261-264
Author(s):  
Jochen Aufrecht ◽  
Andrew Drach ◽  
Adolf Grohbauer ◽  
Uwe Hofmann ◽  
Stefan Theobald ◽  
...  
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Copper Alloys ◽  
Fatigue Performance ◽  
Natural Seawater ◽  
Rectangular Plates ◽  
Cycle Fatigue ◽  
Seawater Environment

Corrosion fatigue performance of two copper alloys (admiralty brass and cupronickel 90/10) is investigated by conducting fatigue tests in artificial seawater. Two different experimental setups are developed and used: immersed rotating beam bending of round wires and immersed flexural cycling of rectangular plates. For the second setup, two sets of specimens are used: as-manufactured and after 1-year exposure to natural seawater in North Atlantic. In addition, the fatigue performance is compared between the dry and immersed tests. It is observed that the fatigue life of copper alloys in seawater environment depends on their composition and manufacturing parameters. Immersion in seawater does not affect low-cycle fatigue, however, high-cycle fatigue behavior shows significant differences. It is also observed that one-year preliminary exposure to natural seawater (stress-free corrosion) results in up to three times reduction of fatigue life at stress amplitudes corresponding to high-cycle fatigue.

scholarly journals Long-term durability of CFRP under fatigue loading for marine applications

2018 ◽  
Vol 165 ◽  
pp. 07001
Author(s):  
Antoine Le Guen-Geffroy ◽  
Pierre-Yves Le Gac ◽  
Malick Diakhate ◽  
Bertrand Habert ◽  
Peter Davies
Keyword(s):  
Composite Materials ◽  
Fatigue Loading ◽  
Fatigue Properties ◽  
Natural Seawater ◽  
Significant Drop ◽  
Marine Transport ◽  
Carbon Fibre Reinforced Polymer ◽  
Influence Of Water ◽  
Seawater Environment ◽  
Marine Applications

Composite propellers are a major new development in the marine transport industry. The use of composite materials in seawater turbines is also of great interest to the marine renewable energy industry. Those systems present similarities being both constantly immersed in seawater, under fatigue loadings, of large dimensions, and they are often designed using Carbon Fibre Reinforced Polymer (CFRP). Previous studies have shown sensitivity of some composite materials to the seawater environment mainly in the quasi-static loading domain. However, investigations now need to be performed on the behaviour of CFRP under seawater environment and fatigue loadings. In this study, CFRP samples were aged in natural seawater until saturation, in order to investigate the influence of water absorption on the fatigue properties of the material. Results showed a small decrease in fatigue lifetime under tension but a more significant drop for sample subjected to four point flexural fatigue.

scholarly journals Sulfate-Reducing Bacteria Impact on Copper Corrosion Behavior in Natural Seawater Environment

2016 ◽  
Vol 06 (02) ◽  
pp. 36-46 ◽  
Author(s):  
Khadija Elmouaden ◽  
Shehdeh Jodeh ◽  
Aicha Chaouay ◽  
Rachid Oukhrib ◽  
Rachid Salghi ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Sulfate Reducing Bacteria ◽  
Natural Seawater ◽  
Copper Corrosion ◽  
Sulfate Reducing ◽  
Seawater Environment ◽  
Reducing Bacteria

TEM study of a biofilm on copper corrosion

1996 ◽  
Vol 54 ◽  
pp. 220-221
Author(s):  
W. A. Chiou ◽  
N. Kohyama ◽  
B. Little ◽  
P. Wagner ◽  
M. Meshii
Keyword(s):  
Marine Bacterium ◽  
Culture Medium ◽  
Copper Alloys ◽  
Pure Copper ◽  
Localized Corrosion ◽  
Natural Seawater ◽  
Copper Corrosion ◽  
New Approach ◽  
The Past ◽  
Copper Tolerant

The corrosion of copper and copper alloys in a marine environment is of great concern because of their widespread use in heat exchangers and steam condensers in which natural seawater is the coolant. It has become increasingly evident that microorganisms play an important role in the corrosion of a number of metals and alloys under a variety of environments. For the past 15 years the use of SEM has proven to be useful in studying biofilms and spatial relationships between bacteria and localized corrosion of metals. Little information, however, has been obtained using TEM capitalizing on its higher spacial resolution and the transmission observation of interfaces. The research presented herein is the first step of this new approach in studying the corrosion with biological influence in pure copper.Commercially produced copper (Cu, 99%) foils of approximately 120 μm thick exposed to a copper-tolerant marine bacterium, Oceanospirillum, and an abiotic culture medium were subsampled (1 cm × 1 cm) for this study along with unexposed control samples.

Commercial aqueous additives as used eco-friendly corrosion inhibitors for carbon steel in natural seawater

2020 ◽  
Vol 65 (1) ◽  
pp. 77-82
Author(s):  
Simona CAPRARESCU ◽  
◽  
Violeta PURCAR ◽  
Cristina MODROGAN ◽  
◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Natural Seawater

scholarly journals Seawater Absorption and Adhesion Properties of Hydrophobic and Superhydrophobic Thermoset Epoxy Nanocomposite Coatings

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 272
Author(s):  
Ayman M. Atta ◽  
Mohamed H. El-Newehy ◽  
Meera Moydeen Abdulhameed ◽  
Mohamed H. Wahby ◽  
Ahmed I. Hashem
Keyword(s):  
Thermal Stability ◽  
Oleic Acid ◽  
Salt Spray ◽  
Adhesion Properties ◽  
In Situ Modification ◽  
Long Time ◽  
Seawater Environment ◽  
Thermoset Epoxy ◽  
The Cost

The enhancement of both thermal and mechanical properties of epoxy materials using nanomaterials becomes a target in coating of the steel to protect it from aggressive environmental conditions for a long time, with reducing the cost. In this respect, the adhesion properties of the epoxy with the steel surfaces, and its proper superhyrophobicity to repel the seawater humidity, can be optimized via addition of green nanoparticles (NPs). In-situ modification of silver (Ag) and calcium carbonate (CaCO3) NPs with oleic acid (OA) was carried out during the formation of Ag−OA and CaCO3−OA, respectively. The epoxide oleic acid (EOA) was also used as capping for Ca−O3 NPs by in-situ method and epoxidation of Ag−OA NPs, too. The morphology, thermal stability, and the diameters of NPs, as well as their dispersion in organic solvent, were investigated. The effects of the prepared NPs on the exothermic curing of the epoxy resins in the presence of polyamines, flexibility or rigidity of epoxy coatings, wettability, and coatings durability in aggressive seawater environment were studied. The obtained results confirmed that the proper superhyrophobicity, coating adhesion, and thermal stability of the epoxy were improved after exposure to salt spray fog for 2000 h at 36 °C.

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