Influence of Thermal Effect on Electrochemical Corrosion Behavior of T2 Copper in Simulated Seawater Environment

This paper has designed electrochemical corrosion experiment of T2 copper in 3.5% NaCl solution to investigate influence of thermal effect on electrochemical corrosion behavior of copper in simulated seawater. Solution temperature was 20°C, 30°C, 40°C and 50°C. The water quality parameters and polarization curve have been measured and analyzed. Corrosion morphology and composition of corrosion products have been observed and analyzed. Thermal effect would lead to water quality variation which influenced the corrosion behavior of copper samples and corrosion potentials would fluctuate with temperature rising. Sample surface of 30°C was neatly covered with fine, uniform and granular corrosion products. There're Cu2O and CuCl on both samples of 20°Cand 30°Cand trace corrosion product of CuC2O40.5H2O and CuCl2 of only 30°C.

Download Full-text

Electrochemical Corrosion Behavior of Corrosion-Resistant Steel for Cargo Oil Tank

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.1876 ◽

2013 ◽

Vol 652-654 ◽

pp. 1876-1880 ◽

Cited By ~ 3

Author(s):

Jing Xu ◽

Jian Wei Yang ◽

Jian Ping Cao

Keyword(s):

Corrosion Behavior ◽

Electrochemical Corrosion ◽

Corrosion Resistant Steel ◽

Resistant Steel ◽

Corrosion Morphology ◽

Corrosion Resistant ◽

Cargo Oil Tank ◽

Electrochemical Corrosion Behavior ◽

Oil Tank ◽

Corrosion Pit

Electrochemical corrosion behavior of corrosion-resistant steel for cargo oil tank were studied under different immersion corrosion time, and tests were carried in the PH=0.85, 10% NaCl solution, which temperature were 30°C. The electrochemical tested by the electrochemical polarization curve and electrochemical impedance spectroscopy (EIS), and the corrosion morphology and distribution of corrosion pit were observed under the metallography. The results indicate that along with the time extending, the corrosion potential of material moved from positive to negative, and then moved to positive. The corrosion current density also first reduced, then followed by the increasing and then decreasing, which indicated that the corrosion products of sample surface experienced a growth - dissolution - growth process, and presented a periodic corrosion rule. The position of corrosion pit mainly occurred around the pearlite.

Download Full-text

Electrochemical Corrosion Behavior of Cu-15Ni-8Sn Alloy in Marine Microbial Medium

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.1099 ◽

2009 ◽

Vol 79-82 ◽

pp. 1099-1102

Author(s):

Yan Hua Lei ◽

Yan Sheng Yin ◽

Chao Hong Liu ◽

Xue Ting Chang ◽

Yan Chen ◽

...

Keyword(s):

Electron Microscopy ◽

Corrosion Behavior ◽

Electrochemical Corrosion ◽

Rich Medium ◽

Sem Images ◽

Electrochemical Corrosion Behavior ◽

Nutrient Rich Medium ◽

Simulated Seawater ◽

Control Samples ◽

Scanning Electron

A comparative study of the corrosion behavior of the copper-nickel-tin alloy in a nutrient–rich simulated seawater-based nutrient-rich medium in the presence and the absence of the marine bacteria was carried out by electrochemical experiments, microscopic methods. Comparing to the corresponding control samples, the electrochemical data demonstrated that the presence of the bacteria accelerated the corrosion of the alloy. Scanning electron microscopy (SEM) images revealed the occurrence of micro-pitting and intergranular corrosion underneath the biofilm on the alloy surface.

Download Full-text

Effect of Corrosion Inhibitor TG201 on Electrochemical Corrosion Behavior of Tubular Steel HP13Cr

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.229-231.155 ◽

2012 ◽

Vol 229-231 ◽

pp. 155-158

Author(s):

Cheng Xian Yin ◽

Juantao Zhang ◽

Zhen Quan Bai ◽

Bin Wei

Keyword(s):

Corrosion Inhibitor ◽

Corrosion Behavior ◽

Corrosion Potential ◽

Electrochemical Corrosion ◽

Impedance Spectrum ◽

Compression Stress ◽

Corrosion Morphology ◽

Environment Effects ◽

Electrochemical Corrosion Behavior ◽

Resistance Performance

This paper studies effect of corrosion inhibitor TG201 on electrochemical corrosion behavior of tubular steel HP13Cr by polarization curve test and exchange impedance spectrum method. It analyzes corrosion morphology by SEM. The results show that the increase of compression stress on HP13Cr lead to its self-corrosion potential shifting negatively, then electrochemical corrosion rate increases. Finally, corrosion resistance performance of HP13Cr steel weakens in acidification environment. Effects of compression stress on electrochemical corrosion become weak by adding TG201 inhibitors. And inhibitor efficiency of TG201 has obvious increase. So controlling compression stress has certain influence on inhibitors efficiency.

Download Full-text

Electrochemical Corrosion Behavior of Cu15Ni10Mn Alloy in NaCl Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.341-342.23 ◽

2013 ◽

Vol 341-342 ◽

pp. 23-27

Author(s):

Wei Cai ◽

An Yun Li ◽

Pian Xu ◽

Yu Wu ◽

Liang Chen ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Corrosion Product ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Copper Chloride ◽

Electrochemical Corrosion ◽

Corrosion Products ◽

Dissolution Mechanism ◽

Nacl Solution ◽

Electrochemical Corrosion Behavior

Investigating the electrochemical corrosion behavior of Cu15Ni10Mn alloy in NaCl solution with different Cl concentration was studied by measuring open-circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. The results show that as the Cl- concentration increase, the corrosion potentials of the alloy shifted negatively, corrosion currents increase, the corrosion process by electrochemical control change of diffusion control, and therefore the corrosion rates become faster. The presence of Cl- have effect on the dissolution mechanism and corrosion products of the alloy, when the concentration of Cl- is relatively low, a reducing peak current appears in the process of cyclic voltammetry retracing , when the Cl- concentration is higher, cyclic voltammetry flyback process does not appear to restore the current peak. This is mainly associated with the generation of corrosion product, when Cl- concentration is low, the corrosion product is Cu2(OH)3Cl (basic copper chloride) and other two copper ion salts, when the concentration of Cl-is higher, corrosion products are mainly Cu2(OH)3Cl (basic copper chloride).

Download Full-text

Electrochemical Corrosion Behavior of Pure Mg Processed by Powder Metallurgy

Coatings ◽

10.3390/coatings11080986 ◽

2021 ◽

Vol 11 (8) ◽

pp. 986

Author(s):

Jozef Minda ◽

Stanislava Fintová ◽

Branislav Hadzima ◽

Pavel Doležal ◽

Michaela Hasoňová ◽

...

Keyword(s):

Corrosion Resistance ◽

Powder Metallurgy ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Electrochemical Corrosion ◽

Corrosion Products ◽

Uniform Corrosion ◽

Electrochemical Corrosion Behavior ◽

Powder Particles ◽

Mechanical Bonding

Pure Mg samples were prepared by powder metallurgy using the cold and hot compacting methods. Cold compacted pure Mg (500 MPa/RT) was characterized by 5% porosity and the mechanical bonding of powder particles. Hot compacted samples (100 MPa/400 °C and 500 MPa/400 °C) exhibited porosity below 0.5%, and diffusion bonding combined with mechanical bonding played a role in material compaction. The prepared pure Mg samples and wrought pure Mg were subjected to corrosion tests using electrochemical impedance spectroscopy. Similar material corrosion behavior was observed for the samples compacted at 500 MPa/RT and 100 MPa/400 °C; however, hot compacted samples processed at 500 MPa/400 °C exhibited longer corrosion resistance in 0.9% NaCl solution. The difference in corrosion behavior was mainly related to the different binding mechanisms of the powder particles. Cold compacted samples were characterized by a more pronounced corrosion attack and the creation of a porous layer of corrosion products. Hot compacted samples prepared at 500 MPa/400 °C were characterized by uniform corrosion and the absence of a layer of corrosion products on the specimen surface. Powder-based cold compacted samples exhibited lower corrosion resistance compared to the wrought pure Mg, while the corrosion behavior of the hot compacted samples prepared at 500 MPa/400 °C was similar to that of wrought material.

Download Full-text