Improvement of MIC Behavior of Ship Plate Steel with LaCl3-Zn Epoxy Coating

2011 ◽  
Vol 488-489 ◽  
pp. 254-257
Author(s):  
Qing Fen Li ◽  
Jun Wang ◽  
Yu Dong Fu ◽  
Chun Hui Li
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Potential ◽  
Steel Specimen ◽  
Epoxy Coating ◽  
Plate Steel ◽  
Sulfate Reducing ◽  
Corrosion Resistance Property ◽  
Reducing Bacteria ◽  
Better Than ◽  
Good Agreement

The MIC behavior of the ship plate steel specimen with LaCl3-Zn epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated in this paper. The variation of corrosion potential over time of different specimens in SRB solution show that the corrosion potential of the specimen with LaCl3-Zn epoxy coating was obviously higher than the Zn-epoxy coating, suggesting that the LaCl3-Zn epoxy coating may offer better protection. The variations of lgflg |Z|=4.5 and fhwith time show that the property of anti-infiltration and corrosion resistance of LaCl3-Zn coating is much better than the ones of Zn-epoxy coating. Results also show that more sulfides and corrosion products of LaCl3-Zn epoxy coating were produced which increased the shielding property of the coating. The experimental results of XRD and SEM are in good agreement with the ones of Ecorr,and EIS, etc. They all show that the LaCl3-Zn epoxy coating exhibits more favorable corrosion resistance property than the Zn-epoxy coating. It is obvious that coating the ship plate steel with LaCl3-Zn epoxy is an effective and promising method against the attack of SRB in marine environment.

Effect of YbCl3-Zn-Epoxy Coating on MIC Behavior of Low Alloy Steel

2011 ◽  
Vol 488-489 ◽  
pp. 250-253
Author(s):  
Yu Dong Fu ◽  
Qing Fen Li ◽  
Jun Wang ◽  
Chun Hui Li
Keyword(s):  
Alloy Steel ◽  
Rare Earths ◽  
Corrosion Potential ◽  
Steel Specimen ◽  
Epoxy Coating ◽  
X Rays ◽  
Low Alloy Steel ◽  
Effective Protection ◽  
Sulfate Reducing ◽  
Reducing Bacteria

In the present study, the rare earths element YbCl3was added into the Zn-epoxy coating, and the MIC behavior of the low alloy steel specimen with YbCl3-Zn-epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated and compared with the specimen of Zn-epoxy coating. Experimental results show that both the YbCl3-Zn-epoxy and Zn-epoxy coating may offer effective protection for the basic low alloy steel. However, the corrosion potential of the specimen with YbCl3-Zn epoxy coating was obviously higher than the Zn-epoxy coating, suggesting that the YbCl3-Zn-epoxy coating may offer more favorable protection. Results of X-rays diffraction (XRD) and surface micrographs of specimens show that more sulfides and corrosion products of YbCl3-Zn-epoxy coating were produced which increased the shielding property of the coating. The mechanism about the effect of YbCl3-Zn-epoxy coating on MIC behavior was further discussed.

MIC Behavior of the Low Alloy Steel with Different Zn-Epoxy Coating in SRB Solution

2011 ◽  
Vol 488-489 ◽  
pp. 262-265 ◽  
Author(s):  
Jun Wang ◽  
Qing Fen Li ◽  
Yu Dong Fu ◽  
Chun Hui Li
Keyword(s):  
Alloy Steel ◽  
Electrochemical Impedance ◽  
Epoxy Coating ◽  
X Rays ◽  
Low Alloy Steel ◽  
Protection Effect ◽  
Sulfate Reducing ◽  
Corrosion Resistance Property ◽  
Reducing Bacteria ◽  
Better Than

The microbiological influenced corrosion (MIC) behavior of the low alloy steel with granular-Zn-epoxy and flaky-Zn-epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated with electrochemical impedance spectroscopy (EIS), X-rays diffraction (XRD), scanning electron microscope (SEM) etc. Results show that the protection effect of the flaky-Zn coating specimen is much better than the granular-Zn coating one. The dissolution of zinc is more severe in granular-Zn coating than in flaky-Zn coating when the specimen immersed in the SRB solution. The shielding property of flaky zinc is much higher than granular zinc in the coating. The flaky-Zn coating is much more compact than the granular-Zn coating and therefore the property of anti-infiltration is much better. We may conclude that the flaky-Zn coating exhibited more favorable corrosion resistance property than the granular one.

Behavior of Microbiological Influenced Corrosion of the Ship Plate Steel in Marine Environment

2007 ◽  
Vol 348-349 ◽  
pp. 25-28
Author(s):  
Qing Fen Li ◽  
Chun Hui Li ◽  
Ping Long ◽  
Li Li Xue
Keyword(s):  
Marine Environment ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Plate Steel ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Sulfate Reducing ◽  
Sterile Seawater ◽  
Reducing Bacteria

The microbiological influenced corrosion (MIC) behaviors of the ship plate steel directly exposed in different medias (the sterile seawater, the ferrous bacteria solution and the sulfate-reducing bacteria solution) were investigated with electrochemical impedance spectroscopy (EIS), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Corrosion potential, electrochemical impedance and micrographs of specimens under different experimental conditions were obtained. Results show that the FB and SRB in the marine environment affect the corrosion behavior of the ship plate steel greatly. The corrosion process in FB and SRB environment was controlled by both bacteria and corrosion products. The mechanism of MIC is discussed.

Microbiological Influenced Corrosion Behavior of Full-Coated and Nicked-Coated Specimens

2010 ◽  
Vol 452-453 ◽  
pp. 181-184
Author(s):  
Jun Wang ◽  
Yu Dong Fu ◽  
Qing Fen Li ◽  
Chun Hui Li
Keyword(s):  
Corrosion Resistance ◽  
Iron Oxide ◽  
Alloy Steel ◽  
Epoxy Coating ◽  
Low Alloy Steel ◽  
Physical Barrier ◽  
Sulfate Reducing ◽  
Test Steel ◽  
Microbial Environment ◽  
Reducing Bacteria

The microbiological influenced corrosion (MIC) behavior of the low alloy steel with Zn-rich epoxy coating and micaceous iron oxide epoxy coating in the sterilized medium and sulfate-reducing bacteria (SRB) solution was investigated by using both full-coated and nicked-coated specimens. Results show that for steel coated with Zn-rich epoxy, the corrosion resistance of both full-coated and nicked-coated specimens was improved obviously. The Zn-rich epoxy coating protected the test steel effectively in the microbial environment with the cathodic protection in the earlier period and physical barrier protection in the later period. For steel coated with micaceous iron oxide epoxy coating, the corrosion resistance of full coated specimens was improved greatly. However, for nicked-coated specimens, corrosion was aggravated because the small anodic area around the nick accelerated the corrosion. It is concluded that the basic low alloy steel may be effectively protected by the micaceous iron oxide epoxy coating only when the steel is perfectly coated with the coating, breakage must be avoided.

Corrosion Behaviors of 0Cr18Ni9 Stainless Steel under the Combination Action of Sulfate-Reducing Bacteria and V.natriegens

2011 ◽  
Vol 356-360 ◽  
pp. 161-164
Author(s):  
Cai Xiang Gu ◽  
Xiao Ming Zhao ◽  
Yan Sheng Yin ◽  
Gui Jun Ji
Keyword(s):  
Stainless Steel ◽  
Corrosion Potential ◽  
Sea Water ◽  
Microbial Corrosion ◽  
Sulfate Reducing ◽  
Facultative Anaerobic ◽  
Corrosion Behaviors ◽  
Microbial Film ◽  
Combined Action ◽  
Reducing Bacteria

Advantage strains SRB and V.natriegens were obtained from the China East Sea for this study. Polarization curves, corrosion potential, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses were adopted in order to investigate the corrosion behaviors of 0Cr18Ni9 stainless steel under the combination action of anaerobic SRB and facultative anaerobic V.natriegens, The characteristics and mechanisms of microbial corrosion action in sea water were analyzed in this paper. The results show that SRB and V.natriegens promote each other’s growth when cultivated in the mixed microbe medium, in which the rate of corrosion is higher than that in the single microbe; Under the combined action of the mixed microbe, the microbial film gets wider and thicker, and corrosion products and metabolite are produced, which furthermore accelerates the passivation and pit corrosion to the 0Cr18Ni9 stainless steel.

scholarly journals Influence of Elements on the Corrosion Resistance of DLC Films

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Nutthanun Moolsradoo ◽  
Shuichi Watanabe
Keyword(s):  
Corrosion Resistance ◽  
Silicon Content ◽  
Corrosion Potential ◽  
Film Structure ◽  
Dlc Film ◽  
Hardness Tester ◽  
Potential Value ◽  
Corrosion Resistance Property ◽  
Nanoindentation Hardness ◽  
Silicon Silicon

Pure DLC, Si-DLC, and Si-N-DLC films deposited from C2H2, C2H2 : TMS and C2H2 : TMS : N2 mixtures were used to study the effects of the elemental contents (silicon, silicon-nitrogen) on deposition and corrosion resistance properties. The films were prepared on Si (100) wafers using the plasma-based ion implantation (PBII) technique. The film structure was analyzed using Raman spectroscopy. The composition at the top surface of the films was measured using energy dispersive X-ray spectroscopy (EDS). The hardness and elastic modulus of the films were measured using a nanoindentation hardness tester. The corrosion performance of the films was conducted using potentiodynamic polarization experiments in an aqueous 0.05 M NaCl solution. The results indicate that the hardness and corrosion resistance of the Si-DLC film increase as the silicon content increases. This is due to the increase of the sp3 cluster. The corrosion resistance of a pure DLC film increases when silicon and silicon-nitrogen are doped into the film. Si-DLC films with a silicon content of 40 at.% had a corrosion potential value of 0.61 V, while a Si-N-DLC film with a silicon and nitrogen content of 19.3 at.% and 1 at.% shows a corrosion potential value of 0.85 V, which is a considerable improvement in the corrosion resistance property.

scholarly journals Experimental Study on the Influence of Sulfate Reducing Bacteria on the Metallic Corrosion Behavior under Disbonded Coating

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Qingmiao Ding ◽  
Liping Fang ◽  
Yanyu Cui ◽  
Yujun Wang
Keyword(s):  
Corrosion Behavior ◽  
Current Density ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
Test Point ◽  
Sulfate Reducing ◽  
Metallic Corrosion ◽  
Reducing Bacteria ◽  
Disbonded Coating

A rectangle disbonded coating simulation device was used to research the effect of sulfate reducing bacteria (SRB) on the metallic corrosion behavior under disbonded coating by the electrochemical method. The results showed that the metal self-corrosion potential at the same test point had little change in the initial experiment stage, whether the solution was without or with SRB. The potential amplitude in the solution with SRB was larger than that without SRB in the later corrosion period. The corrosion current density of the metal at the same test point increased gradually over time in the solution with or without SRB, and SRB could accelerate the corrosion of the metal in the disbonded crevice. The metal self-corrosion potential in the crevice had little change in the SRB solution environment after adding the fungicide, but the corrosion current density decreased significantly. That meant the growth and reproduction of SRB were inhibited after adding the fungicide, so the metal corrosion rate slowed down. Among the three kinds of solution environment, increasing the coating disbonded thickness could accelerate the corrosion of the metal in the crevice, and it was the largest in the solution with SRB.

Improvement of Corrosion Behavior of the Cu-Ni Alloy with Electroless Ni-P Plating

2009 ◽  
Vol 417-418 ◽  
pp. 29-32
Author(s):  
Qing Fen Li ◽  
Yu Dong Fu ◽  
Hai Dou Wang ◽  
Jun Wang
Keyword(s):  
Corrosion Resistance ◽  
Grain Boundary ◽  
Corrosion Behavior ◽  
Good Condition ◽  
Structure Defects ◽  
Sulfate Reducing ◽  
Crystalline Defects ◽  
Ni Alloy ◽  
Reducing Bacteria ◽  
Electroless Ni

The microbiological influenced corrosion (MIC) behavior of the Cu-Ni alloy with or without Ni-P plating in the sterilized medium and sulfate-reducing bacteria (SRB) solution was investigated. Results show that severe pitting corrosion appeared on the uncoated specimens in both the sterilized medium and the SRB solution when the specimens coated with Ni-P plating were still in good condition. Since the Ni-P plating may offer both barrier and cathodic protection to the base metal. Besides, the structures of Ni-P plating and the passive film on the surface of the Ni-P plating are high uniform and amorphous without any structure defects. The non-crystalline structure may improve the corrosion resistance because it does not have crystalline defects such as dislocation, grain boundary, twin and so on which may cause corrosion easily. It is concluded that corrosion behavior of the Cu-Ni alloy with electroless Ni-P plating was improved greatly.

A Comparative Study of the Effects of Sulfate Reducing Bacteria on Corrosion of Carbon Steel Q235 under Simulated Disbonded Coating with Different Width of Aperture

2012 ◽  
Vol 503-504 ◽  
pp. 247-250 ◽  
Author(s):  
Ping Zhao ◽  
Jia Xing Yang ◽  
Peng Peng Zhu ◽  
Cheng Sun ◽  
Jin Xu
Keyword(s):  
Carbon Steel ◽  
Corrosion Potential ◽  
Sulfate Reducing Bacteria ◽  
Soil Extract ◽  
Corrosion Process ◽  
Sulfate Reducing ◽  
Aperture Width ◽  
Reducing Bacteria ◽  
Disbonded Coating ◽  
Crevice Width

The effect of sulfate reducing bacteria (SRB) on the corrosion of Q235 steel has been investigated in the crevice under the simulated disbonded coating with aperture width of 1.0 and 0.5mm in the soil-extract solutions (SES) by using electrochemical methods. The results show that the existence of SRB in SES can cause corrosion potential of the working electrode to shift to a more negative value, and the formation of pitting on the surface of the electrode. Compared with the crevice width of 1.0mm, the corrosion potential of the electrode shows a little more positive at the crevice width of 0.5mm. The corrosion rate of the electrode increases with the increase of aperture width in the SES without SRB, however, decreases with the increase of aperture width in the SES with SRB. The results obtained indicate that either bio-film on the surface of the electrode formed by SRB in SES or aperture width has obvious influences on the crevice corrosion process of the carbon steel.

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