Localized Electrochemical Corrosion Characteristics of Carbon Steel in Seawater

2013 ◽  
Vol 842 ◽  
pp. 104-109
Author(s):  
Yan Zou ◽  
Qiang Bai ◽  
Jia Wang ◽  
Wei Wang ◽  
Xiang Feng Kong
Keyword(s):  
Carbon Steel ◽  
Water Surface ◽  
Immersion Time ◽  
Electrochemical Corrosion ◽  
Corrosion Products ◽  
Local Corrosion ◽  
Immersion Period ◽  
Wire Beam Electrode

The galvanic and potential distributions of carbon steel immersed in seawater were studied by wire beam electrode (WBE) technique. Results indicated that the corrosion of carbon steel in seawater tended to local corrosion. With immersion time increasing, local corrosion was more and more serious. During the initial immersion period, the top of the coupon near the water surface was main cathode. With the corrosion extended, corrosion products gradually gathered on the surface of the carbon steel. Potential differences between cathode and anode gradually became small. Cathode and anode redistributed on the surface of carbon steel. At last, the top and the bottom were cathode while the middle was anode. The areas of anode first increased and then decreased. The areas of cathode were in contrast.

scholarly journals Efektivitas Ekstrak Kulit Buah Maja Sebagai Inhibitor pada Baja Karbon Aisi 1020 dalam Medium Korosif Nacl 3% dengan Variasi Waktu Perendaman

2020 ◽  
Vol 8 (2) ◽  
pp. 159-168
Author(s):  
Ismi Nurhayati ◽  
◽  
Pulung Karo Karo ◽  
Syafriadi Syafriadi ◽  
◽  
...  
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Corrosion Product ◽  
Corrosive Medium ◽  
Immersion Time ◽  
Corrosion Products ◽  
Skin Extract ◽  
Fruit Skin ◽  
Steel Aisi

Research has been conducted on the effectiveness of maja fruit skin extract as an inhibitor of carbon steel AISI 1020 in a corrosive medium NaCl 3% with variations in immersion time. The samples carbon steel AISI 1020 were immersed in corrosive medium NaCl 3% without being given and given the inhibitor of maja skin extract with a concentration of 0.8% for 5, 15, 25, 35, and 45 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of the maja fruit skin extract inhibitor was effective in reducing the corrosion rate of the sample with the greatest efficiency at 35 days immersion, which was equal to 72.35%. The results of XRD characterization show that the phase formed is pure Fe and Fe3O4 phase which is a corrosion product is immersed without inhibitor. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion was there were cracks, holes, and lumps which indicated that the sample had been corroded. The results of EDS characterization show that in the soaked sample there were corrosion products in the form of FeO compounds whose magnitude increased every time immersion.

NOVEL TYPE OF GRADIENT-DISTRIBUTED WIRE BEAM ELECTRODE MEASURED IN 3.5 wt.% NaCl AND ITS APPLICATION IN FAST DETECTION TECHNIQUE

2019 ◽  
Vol 27 (06) ◽  
pp. 1930004
Author(s):  
YULIN LI ◽  
FANBO YU ◽  
QINGDONG ZHONG
Keyword(s):  
Carbon Steel ◽  
High Carbon Steel ◽  
Electrochemical Corrosion ◽  
Medium Carbon Steel ◽  
Neutral Salt ◽  
High Carbon ◽  
Corrosive Solution ◽  
Corrosion Medium ◽  
Steel Wires ◽  
Wire Beam Electrode

In this paper, the electrochemical performance of a novel gradient-distributed wire beam electrode (WBE) is measured in different corrosion medium. This electrode contains three kinds of carbon steel with different carbon content. WBE was consisted of 100 carbon steel wires and regularly prepared into a [Formula: see text] matrix. The carbon steel wires for each row is the same, but the adjacent rows are different. The electrochemical corrosion behavior of regions with different carbon steel wires can be tested clearly. The results revealed that the heterogeneity of local corrosion of metal, which can be well studied by WBE, meanwhile, the phenomenon of polarity reversal can also be detected. Corrosion potential–current distribution map of the novel WBE showed obvious striped features when immersed in 3.5[Formula: see text]wt.% NaCl solution with different pH (pH[Formula: see text]2, 6 and 12). Corrosion firstly occurred in the high carbon steel region in the acidic conditions, and then quickly spreads to other areas, eventually causing the entire surface of the WBE to be corroded. While in the neutral salt solution, only the regions of high carbon steel and some part of medium carbon steel area appeared obvious anode currents during a long time testing. When the pH of corrosive solution reached to 12, the corrosion rate is greatly reduced and then corrosion process is suppressed. This new method can evaluate the corrosion resistance of materials more accurately.

Corrosion behaviour of X65 carbon steel under the intermittent oil/water wetting: A synergic effect of flow velocity and alternate immersion period

2021 ◽  
Vol 187 ◽  
pp. 109507
Author(s):  
Wen Long Ma ◽  
Han Xiang Wang ◽  
Richard Barker ◽  
Nikil Kapur ◽  
Yong Hua ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Flow Velocity ◽  
Corrosion Behaviour ◽  
Synergic Effect ◽  
Water Wetting ◽  
Immersion Period ◽  
Oil Water

Impact of corrosion products on performance of imidazoline corrosion inhibitor on X65 carbon steel in CO2 environments

2021 ◽  
Vol 185 ◽  
pp. 109423
Author(s):  
Amir Shamsa ◽  
Richard Barker ◽  
Yong Hua ◽  
Evgeny Barmatov ◽  
Trevor L. Hughes ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Products

scholarly journals Experimental Theoretical Studies on Extract of Date Palm Seed as a Green Anti-Corrosion Agent in Hydrochloric Acid Solution

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3535
Author(s):  
Naba Jasim Mohammed ◽  
Norinsan Kamil Othman ◽  
Mohamad Fariz Mohamad Taib ◽  
Mohd Hazrie Samat ◽  
Solhan Yahya
Keyword(s):  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Active Sites ◽  
Immersion Time ◽  
Steel Surface ◽  
Date Palm ◽  
Inhibition Efficiency ◽  
Experimental Results ◽  
Plant Materials ◽  
Carbon Steel Surface

Extracts from plant materials have great potential as alternatives to inorganic corrosion inhibitors, which typically have harmful consequences. Experimental and theoretical methodologies studied the effectiveness of agricultural waste, namely, date palm seed extract as a green anti-corrosive agent in 0.5 M hydrochloric acid. Experimental results showed that immersion time and temperature are closely related to the effectivity of date palm seed as a corrosion inhibitor. The inhibition efficiency reduced from 95% to 91% at 1400 ppm when the immersion time was increased from 72 h to 168 h. The experimental results also indicated that the inhibition efficiency decreased as the temperature increased. The presence of a protective layer of organic matter was corroborated by scanning electron microscopy. The adsorption studies indicated that date palm seed obeyed Langmuir adsorption isotherm on the carbon steel surface, and Gibbs free energy values were in the range of −33.45 to −38.41 kJ·mol−1. These results suggested that the date palm seed molecules interacted with the carbon steel surface through mixture adsorption. Theoretical calculations using density functional theory showed that the capability to donate and accept electrons between the alloy surface and the date palm seed inhibitor molecules is critical for adsorption effectiveness. The HOMO and LUMO result indicated that the carboxyl (COOH) group and C=C bond were the most active sites for the electron donation-acceptance type of interaction and most auxiliary to the adsorption process over the Fe surface.

scholarly journals Electrochemical Corrosion of Ultra-high Strength Carbon Steel in Alkaline Brines Containing Hydrogen Sulfide

2016 ◽  
Vol 212 ◽  
pp. 998-1009 ◽  
Author(s):  
Ruishu Feng ◽  
Justin Beck ◽  
Margaret Ziomek-Moroz ◽  
Serguei N. Lvov
Keyword(s):  
Hydrogen Sulfide ◽  
Carbon Steel ◽  
Electrochemical Corrosion ◽  
High Strength

Effect of Nanoparticle Addition in Hybrid Sol-Gel Silane Coating on Corrosion Resistance of Low Carbon Steel

2013 ◽  
Vol 686 ◽  
pp. 244-249 ◽  
Author(s):  
Poovarasi Balan ◽  
Aaron Ng ◽  
Chee Beng Siang ◽  
R.K. Singh Raman ◽  
Eng Seng Chan
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Low Carbon Steel ◽  
Electrochemical Corrosion ◽  
Alumina Nanoparticles ◽  
Low Carbon ◽  
Silane Coating ◽  
Sol Gel Films

Chromium pre-treatments of metal have been replaced by silane pre-treatments as more environmental friendly option. Nanoparticles can be added in the silane sol-gel network have been reported to improve corrosion resistance. In this work, the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film filled with nanoparticles was evaluated. The sol-gel films have been synthesized from 3-glycidoxy-propyl-trimethoxy-silane (3-GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors. These films have been impregnated with 300 ppm of silica or alumina nanoparticles. The electrochemical behavior of the coated steel was evaluated by means of electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Equivalent circuit modeling, used for quantifying the EIS measurements showed that sol-gel films containing silica nanoparticles improved the barrier properties of the silane coating. The silica nanoparticle-containing films showed highest initial pore resistance over the five days of immersion in 0.05M NaCl.

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