Variations of galvanic currents and corrosion forms of 2024/Q235/304 tri-metallic couple with multivariable cathode/anode area ratios: Experiments and modeling

2020 ◽  
Vol 359 ◽  
pp. 136947
Author(s):  
Linjun Shi ◽  
Yingwei Song ◽  
Pingping Zhao ◽  
Haitao Wang ◽  
Kaihui Dong ◽  
...  
Keyword(s):  
Anode Area

Positive Temperature Coefficient SiC PiN Diodes

2012 ◽  
Vol 717-720 ◽  
pp. 981-984 ◽  
Author(s):  
Eugene A. Imhoff ◽  
Karl D. Hobart ◽  
Francis J. Kub ◽  
M.G. Ancona ◽  
Rachael L. Myers-Ward ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Voltage Drop ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Pin Diodes ◽  
Current Density Range ◽  
Forward Voltage Drop ◽  
Current Densities ◽  
Anode Area ◽  
Ballast Resistance

Integration of patterned ballast resistance into the anode of SiC PiNs is a solution to the dilemma of negative dVf /dT for such diodes. In fabricated 4H-SiC PiN diodes, we demonstrate a cross-over from negative to positive temperature coefficient for current densities as low as 80 A/cm2. Adjusting the percentage of the patterned anode area, the positive or neutral dVf /dT can be achieved over a wide current-density range without substantial penalty in the forward voltage drop. This characteristic is crucial for high-power SiC packages with ganged-parallel rectifier arrays.

scholarly journals Research Progress of Nitrite Corrosion Inhibitor in Concrete

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Yilin Song ◽  
Junzhe Liu ◽  
Hui Wang ◽  
Haibin Shu
Keyword(s):  
Physical Property ◽  
Ion Concentration ◽  
Research Progress ◽  
Molar Ratio ◽  
Nitrite Ion ◽  
Reinforcing Bar ◽  
Application Condition ◽  
Steel Bar ◽  
Anode Area

Nitrite inhibitor is a kind of most effective inhibitory corrosion additive used in reinforced concrete. This paper expounded the inhibiting mechanism and physical property of nitrite in concrete. Moreover, the recent progress and application condition at home and abroad were summarized. Meanwhile, corresponding methods for detecting nitrite ion concentration is proposed. Additionally, the inhibition practice on corrosion protection of reinforcing bar in concrete was presented. The long-term inhibiting effectiveness of nitrite ion in concrete when the n(NO2-)/n(Cl-) ratios were above the threshold values in concrete was obtained. Finally it is confirmed that critical molar ratio of n(NO2-)/n(Cl-) increased with differential nitrite ion concentration, higher cathode, and anode area ratio in steel bar.

Corrosion Properties of 20# Pipelines Steel in Near-Neutral Soils

2010 ◽  
Vol 129-131 ◽  
pp. 312-316
Author(s):  
Wen He Wang ◽  
Jun Yi ◽  
Shi Ming Shen
Keyword(s):  
Open Circuit Potential ◽  
Low Carbon Steel ◽  
Open Circuit ◽  
Corrosion Mechanism ◽  
Low Carbon ◽  
Corrosion Properties ◽  
Corrosion Rates ◽  
Cathode Area ◽  
Neutral Soil ◽  
Anode Area

Corrosion law and mechanism of 20# low-carbon steel in near-neutral soil along Yangtze River in Nanjing are studied by experiments of buried specimens in laboratory. In three kinds of soils, the corrosion features and products are analyzed by EDS and XRD, and the relation of corrosion rates, open-circuit potential and polarization curve with times are tested. The results indicated that corrosion rates changed incessantly along. On the condition of the same times, specimens and different soil samples, the corrosive degree of 1# and 2# specimens are serious, but 3# specimen is serious lightly. The corrosion products are main non-crystalloid, Fe (OH) 3 and Fe2O3.The changing tendency of different times and soils is different, and accordant with that of corrosion rates. The corrosion mechanism is discussed lastly, in near-neutral soils, oxygen is deoxidized and OH- ions are created in cathode area, iron is oxidized and the hydration of Fe2+ ions is created with water from soil in anode area, and Fe2+ are converted into more steady products Fe（OH）3 and Fe2O3.

The Electrical Properties and Changes on the Substrates of Microbial Fuel Cells Using Excess Sludge

2014 ◽  
Vol 535 ◽  
pp. 141-144
Author(s):  
Xiao Qin Zhao ◽  
Xiao Jie Sun
Keyword(s):  
Fuel Cells ◽  
Anaerobic Digestion ◽  
Microbial Fuel Cells ◽  
Control Device ◽  
Anaerobic Sludge ◽  
Excess Sludge ◽  
Test Volume ◽  
Significant Difference ◽  
Nacl Concentration ◽  
Anode Area

A single-chamber and membrane-less microbial fuel cells (MFC) was successfully started up using anaerobic sludge as inoculums without any nutrient elements for 20 d. Under 30 °C, excess sludge SS was about 21000 mg·L-1, anode area for 31.4 cm2and in 200 mM NaCl concentration agent conditions experiment MFC, while the control device (CD) directly with original sludge anaerobic digestion. The electricity generation of microbial fuel cell and the contrast of substrate changes were investigated. The results show that obtained maximum voltage is 597.3 mV, pH in MFC is slightly higher than in contrast test. Volume reduction in MFC is larger than the controls. Reducing sugar in MFC is lower than that in CDs. Proteins increase at first and then decrease, finally there is no significant difference in both of MFC and CD. Key words: Microbial Fuel Cells, Excess Sludge, Anaerobic Digestion, Reutilization

Correlation Between Anode Area and Sensitivity for the TiN/GaN Schottky Barrier Diode Temperature Sensor

2020 ◽  
Vol 67 (3) ◽  
pp. 1171-1175
Author(s):  
Xiaobo Li ◽  
Taofei Pu ◽  
Xianjie Li ◽  
Liuan Li ◽  
Jin-Ping Ao
Keyword(s):  
Schottky Barrier ◽  
Temperature Sensor ◽  
Schottky Barrier Diode ◽  
Anode Area
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