scholarly journals Galvanic coupling effects for module-mounting elements of ground-mounted photovoltaic power station

2017 ◽  
Vol 19 (4) ◽  
pp. 22-27
Author(s):  
Boguslaw Pierozynski ◽  
Henryk Bialy
Keyword(s):  
Ph Value ◽  
Corrosion Behaviour ◽  
Surface Condition ◽  
Construction Materials ◽  
Coated Steel ◽  
Coupling Effects ◽  
Galvanic Coupling ◽  
Galvanic Current ◽  
Power Stations ◽  
Galvanic Cells

Abstract This communication reports on the concerns associated with possible generation of galvanic coupling effects for construction materials that are used to manufacture mounting assemblies for ground-mounted photovoltaic (PV) power stations. For this purpose, six macro-corrosion galvanic cells were assembled, including: hot-dip Zn/Magnelis®-coated steel/Al and stainless steel (SS)/Al cells. Corrosion experiments involved continuous, ca. three-month exposure of these couplings in 3 wt.% NaCl solution, conducted at room temperature for a stable pH value of around 8. All corrosion cells were subjected to regular assessment of galvanic current-density and potential parameters, where special consideration was given to compare the corrosion behaviour of Zn-coated steel samples with that of Magnelis®-coated electrodes. Characterization of surface condition and elemental composition for examined materials was carried-out by means of SEM and EDX spectroscopy techniques.

scholarly journals Evaluation of Electrochemical Treatment of Chloride Contaminated Mortar Containing GGBS

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ki Hong Lee ◽  
Young Hee Jung ◽  
Jun Pil Hwang ◽  
Jong Sung Sim
Keyword(s):  
Current Density ◽  
Corrosion Behaviour ◽  
Chloride Concentration ◽  
Corrosion Damage ◽  
Electrochemical Treatment ◽  
Open Circuit ◽  
Galvanic Current ◽  
Treatment Conditions ◽  
Binder Type ◽  
Superior Corrosion Resistance

The present study concerns the influence of cementitious binder on electrochemical treatment of steel embedded in salt contaminated mortar. As binder, ordinary Portland cement (OPC) and ground granulated blast furnace slag (GGBS) were used and the current density of 250–750 mA/m2 was applied for 4 weeks to complete electrochemical chloride extraction. To evaluate the effect of electrochemical treatment the chloride profile and corrosion behaviour covering chloride concentration, galvanic current density, linear polarization resistance, open circuit potential, and mass loss were measured. An increase in the applied direct current density resulted in a decrease in the chloride concentration at the vicinity of steel, accompanying the mitigated corrosion damage. The performance of electrochemical treatment was more remarkable in mortar containing GGBS presumably due to binding mechanism. However, corrosion damage was more detrimental in GGBS rather than OPC at a given potential, while GGBS had superior corrosion resistance to a corrosive environment and treatment conditions. Therefore, the electrochemical treatment should be conducted prudently to evaluate the corrosion state of embedded steel depending on binder type.

scholarly journals Removal of Phenol from Aqueous Solution by Adsorption on to Coal Fly Ash

1996 ◽  
Vol 13 (6) ◽  
pp. 527-536 ◽  
Author(s):  
L.J. Alemany ◽  
M.C. Jiménez ◽  
M.A. Larrubia ◽  
F. Delgado ◽  
J.M. Blasco
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Efficiency ◽  
Ph Value ◽  
Coal Fly Ash ◽  
Solid Wastes ◽  
Power Stations ◽  
Different Temperatures ◽  
Coal Power ◽  
Coal Power Stations

The present work examines the possible use of fly ash, a byproduct of coal power stations, as a means of removing phenol from water, or equivalently, of restricting its movement in solid wastes or soil. Equilibrium experiments were performed to evaluate the removal efficiency of fly ash. The adsorption experiments were undertaken using fly ash treated at three different pH levels and with three different temperatures. The results indicate that although phenol can be removed from water, this depends markedly on the temperature and pH value of the treatment solution employed.

scholarly journals Corrosion behaviour of stainless steel-titanium alloy linear friction welded joints: Galvanic coupling

2014 ◽  
Vol 66 (2) ◽  
pp. 111-117 ◽  
Author(s):  
A. Astarita ◽  
M. Curioni ◽  
A. Squillace ◽  
X. Zhou ◽  
F. Bellucci ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Welded Joints ◽  
Corrosion Behaviour ◽  
Galvanic Coupling ◽  
Linear Friction

scholarly journals Polarization Studies on Inhibitory Effect of Chromates and Dichromates on Corrosion of Tin Coated Steel in 0.5M Monochloroacetic Acid

2008 ◽  
Vol 5 (2) ◽  
pp. 302-308
Author(s):  
Sangita Sharma ◽  
Kinnari H. Parikh ◽  
Mahesh V. Kadia ◽  
Falguni D. Thakkar ◽  
Dhara D. Patel
Keyword(s):  
Corrosion Behaviour ◽  
Potassium Dichromate ◽  
Corrosion Current ◽  
Inhibitory Effect ◽  
Open Circuit ◽  
Potassium Chromate ◽  
Monochloroacetic Acid ◽  
Sodium Chromate ◽  
Coated Steel ◽  
Sodium Dichromate

Chromates and Dichromates have been tested for its inhibitory effects towards tin coated steel in 0.5M monochloroacetic acid. The corrosion behaviour of potassium chromate, sodium chromate, potassium dichromate, sodium dichromate and ammonium dichromate was studied by polarization curves, Tafel parameters like Tafel slopes, extrapolation of cathodic Tafel line and intersection of cathodic and anodic line at open circuit potential in presence of inhibitors have been tabulated along with other electrochemical parameters and corrosion current have been calculated from Tafel lines. The efficiencies are calculated and compared reasonably well with those obtained from loss in weight data. All the inhibitors induce a significant increase of potential positive and direction accounts for cathodic polarization. The Icorrhas also been calculated and that accounts well for cathodic reactions in presence of chromates and dichromates as inhibitors.

Corrosion Behavior of Enamel Coated Steel Rebar by EIS

2012 ◽  
Vol 450-451 ◽  
pp. 445-453 ◽  
Author(s):  
Fu Jian Tang ◽  
Gen Da Chen ◽  
Jeffery S. Volz ◽  
Richard K. Brow ◽  
Michael Koenigstein
Keyword(s):  
Corrosion Resistance ◽  
Pore Structure ◽  
Enamel Coating ◽  
Surface Condition ◽  
Corrosion Process ◽  
Coated Steel ◽  
Nacl Solution ◽  
Steel Rebar ◽  
Interconnected Pore ◽  
Interconnected Pore Structure

In this study, the corrosion process of enamel-coated deformed rebar completely immersed in 3.5 wt.% NaCl solution was evaluated over a period of 84 days by EIS testing. Three types of enamel coating were investigated: pure enamel, 50/50 enamel coating, and double enamel. Surface condition of the enamel coatings that were intentionally damaged prior to corrosion tests was visually examined at different immersion times. After 84 days of testing, the damaged coating areas were characterized by SEM, and the corrosion products on and adjacent to the damaged areas were collected and analyzed by XRD. Corrosion initiated at the damaged locations with no undercutting of the coating observed. The 50/50 enamel coating had the least corrosion resistance, due to its interconnected pore structure, and prior damage drastically reduced the corrosion resistance of pure and double enamel coated rebar.

scholarly journals Galvanic coupling effects on the corrosion behavior of the 6061 aluminum alloy used in research nuclear reactors

2020 ◽  
Vol 541 ◽  
pp. 152440
Author(s):  
Mariana X. Milagre ◽  
Uyime Donatus ◽  
Rejane Maria P. Silva ◽  
Abenchara M. Betancor-Abreu ◽  
Oscar M. Prada Ramirez ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Nuclear Reactors ◽  
Coupling Effects ◽  
Galvanic Coupling ◽  
6061 Aluminum Alloy

Modern methods of treatment of patients with intolerance to dental construction materials

MedAlliance ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 80-89
Keyword(s):  
Construction Materials ◽  
Clinical Effectiveness ◽  
Tantalum Pentoxide ◽  
Psychological Status ◽  
Galvanic Current ◽  
Treatment Algorithms ◽  
Personal Anxiety ◽  
Resistance To Stress ◽  
High Level ◽  
Methods Of Treatment

Objective: to develop algorithms for treating patients with intolerance to dental construction materials (IDCM) and evaluate the clinical effectiveness of using an insula­ting coating of tantalum pentoxide (Ta2O5) on the surface of prosthetic constructions. Materials and methods. 552 patients (507 women and 45 men) with IDCM were examined. Basic and additional research methods were used, including exposure and provocative tests, epicutaneous and intraoral epimucous allergological tests, mea­surement of impedance and galvanic current, and assessment of the psychological status of patients. Results. The average number of comorbidities per person in patients with an allergy and a combination of several types of IDCM is significantly higher than in patients with galvanosis and toxic-chemical stomatitis (p<0.001). In patients with IDCM of an allergic nature and a combination of several types of IDCM, a direct correlation was found between the number of concomitant diseases per person and the probability of IDCM (r=0.614 and r=0.683, respectively, p<0.01). Concomitant pathology of organs and tissues of the oral cavity was detected in 39.49% of patients with IDCM. In 57.6% of cases, patients with IDCM showed a high level of personal anxiety (Spielberger–Khanin personal anxiety scale). 23.1% of patients had a high level of alexithymia (more than 74 points on the Toronto Alexithymia Scale). The method of determining stress resistance and social adap­tation of Holmes–Rahe showed low resistance to stress in 23.1% of patients with IDCM. Treatment algorithms for patients with IDCM take into account the need to correct comorbidities and are based on the principles of comple­xity, consistency, individuality, systematicity and continuity of treatment. Conclusion. The proposed algorithms for treating patients with IDCM have shown their clinical effectiveness. The use of Ta2O5 as an insulating coating for metal and acrylic prosthetic constructions is an effective method of prevention and treatment of IDCM.

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