scholarly journals Ⅳ. Electrochemical Measurements in Various Environments―Atmospheric Corrosion II （Electrochemical Impedance Method）―

2018 ◽  
Vol 67 (7) ◽  
pp. 280-286
Author(s):  
Hideki Katayama
Keyword(s):  
Atmospheric Corrosion ◽  
Electrochemical Impedance ◽  
Electrochemical Measurements ◽  
Impedance Method

Reproducbility of Electrochemical Measurements of Atmospheric Corrosion Phenomena

2009 ◽  
pp. 309-309-30 ◽  
Author(s):  
F Mansfeld ◽  
S Tsai ◽  
S Jeanjaquet ◽  
E Meyer ◽  
K Fertig ◽  
...  
Keyword(s):  
Atmospheric Corrosion ◽  
Electrochemical Measurements

scholarly journals Poly (Vinyl Butyral-Co-Vinyl Alcohol-Co-Vinyl Acetate) Coating Performance on Copper Corrosion in Saline Environment

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 439
Author(s):  
Adriana Samide ◽  
Claudia Merisanu ◽  
Bogdan Tutunaru ◽  
Gabriela Eugenia Iacobescu
Keyword(s):  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Electrochemical Impedance ◽  
Copper Surface ◽  
Copper Sample ◽  
Electrochemical Measurements ◽  
Copper Corrosion ◽  
Nacl Solution ◽  
Force Microscopy ◽  
Vinyl Butyral

Poly (vinyl butyral-co-vinyl alcohol-co-vinyl acetate) named further PVBA was investigated as a protective coating for copper corrosion in 0.9% NaCl solution using electrochemical measurements such as, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization associated with atomic force microscopy (AFM). The PVBA coating on the copper surface (Cu-PVBA) was modeled in methanol containing PVBA. Its inhibitory properties against corrosion was comparatively discussed with those of the copper sample treated in methanol without polymer (Cu-Me) and of untreated sample (standard copper). A protective performance of PVBA coating of 80% was computed from electrochemical measurements, for copper corrosion in NaCl solution. Moreover, AFM images designed a specific surface morphology of coated surface with PVBA, clearly highlighting a polymer film adsorbed on the copper surface, which presents certain deterioration after corrosion, but the metal surface was not significantly affected compared to those of untreated samples or treated in methanol, in the absence of PVBA.

Corrosion Behavior of 6000 Series Aluminum Alloys Produced by Conventional and Powder Extruded Process through Electrochemical Impedance Method

2010 ◽  
Vol 654-656 ◽  
pp. 1964-1967
Author(s):  
Satoshi Sunada ◽  
Norio Nunomura ◽  
Kazuhiko Majima
Keyword(s):  
Aluminum Alloys ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
The Other ◽  
Impedance Method ◽  
Ingot Metallurgy ◽  
Transfer Resistance ◽  
Maximum Charge ◽  
Cathodic Region

In this study, the electrochemical measurements such as the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) tests were carried out in order to clarify the corrosion behavior of the aluminum alloys fabricated by powder extruded (P/E) process compared with those by ingot metallurgy (I/M) process, using 6000 system aluminum alloys. Two kinds of aluminum specimens; one is fabricated by the conventional I/M specimen and the other is fabricated by the P/E process, were used for the electrochemical experiment in the sulfuric acid solution with 0.5 kmol/m3 concentration. Both of I/M and P/E specimens showed the linear relationship between the electrochemical potential (E) and the common logarithm of current density (icorr) in the cathodic region where Tafel law was recognized irrespective of stirring of the test solution though the icorr was slightly increased by stirring for both specimens. On the other hand, in the anodic region, both of the two specimens indicated the almost the same icorr irrespective of stirring. These experimental results interpret that the corrosion is controlled by the chemical reaction. The EIS test indicated that the maximum charge transfer resistance (Rct) was observed at -0.55 V which is 0.11 V higher potential than the corrosion potential (Ecorr) for both of the two specimens.

Tracing hydration feature of aluminophosphate cementitious materials by means of electrochemical impedance method

2016 ◽  
Vol 113 ◽  
pp. 997-1006 ◽  
Author(s):  
Biqin Dong ◽  
Jianchao Zhang ◽  
Yuqing Liu ◽  
Guohao Fang ◽  
Zhu Ding ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Cementitious Materials ◽  
Impedance Method
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