The Effect of Thiourea Additive to Elimination of the Iron Dissolved in Flux Solution of Hot Dip Galvanizing Process

2012 ◽  
Vol 538-541 ◽  
pp. 186-189
Author(s):  
Kyung Man Moon ◽  
Min Seok Oh ◽  
Jong Pil Won ◽  
Myung Hoon Lee ◽  
Yun Hae Kim
Keyword(s):  
Structural Steel ◽  
Current Density ◽  
Manufacturing Process ◽  
Iron Ion ◽  
Applied Current ◽  
Optimum Amount ◽  
Applied Current Density ◽  
Dissolved Iron ◽  
Effect Of Additives ◽  
The Cost

Hot dip galvanizing is being widely used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and for some other fields etc.. Recently, the cost of zinc is getting higher and higher, thus, a proper manufacturing process should be developed possibly to reduce the cost of production. one of hot dip galvanizing process, that is, flux solution immersion process is very important to control more effective coating. However, flux solution is deteriorated with increasing its using time because dissolved iron from structural steel due to continuous flux treatment was increasingly increased, which is resulted in coating badness and increment of dross. In this study, the effect of additives to elimination of iron dissolved in flux solution was investigated with four types of inner solution, that is, solution of inner barrel was filled with seawater, NaOH, NH4Cl, including parameters of amounts of thiourea(0.2,0.4 ,0.6 and 0.8g) and electrolysis experiment was carried out with applied current density at 20mA/cm2. The best effect for elimination of iron from flux solution is considered that inner barrel with separator should be filled with solution different from original flux solution which contained in iron ion, that is, its inner solution should be composed with seawater added with additives such as thiourea(0.4g), NaOH(0.2 g) and NH4Cl(10g). In particular, we can see that the optimum amount of thiourea to extract effectively iron from flux solution is 0.4g.

The Effect of Additives (NH4Cl) to Elimination of the Iron Dissolved in Flux Solution of Hot Dip Galvanizing Process

2012 ◽  
Vol 557-559 ◽  
pp. 1905-1909
Author(s):  
Kyung Man Moon ◽  
Min Seok Oh ◽  
Dong Hyun Park ◽  
Myung Hoon Lee
Keyword(s):  
Structural Steel ◽  
Current Density ◽  
Manufacturing Process ◽  
Iron Ion ◽  
Applied Current ◽  
Applied Current Density ◽  
Dissolved Iron ◽  
Effect Of Additives ◽  
Electrolysis Method ◽  
The Cost

Hot dip galvanizing is being widely used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and for some other fields etc.. Recently, the cost of zinc is getting higher and higher, thus, a proper manufacturing process should be developed possibly to reduce the cost of production. one of hot dip galvanizing process, that is, flux solution immersion process is very important to control more effective coating. However, flux solution is deteriorated with increasing its using time because dissolved iron from structural steel due to continuous flux treatment was increasingly increased, which is resulted in coating badness and increment of dross. In this study, the effect of additives to elimination of iron dissolved in flux solution was investigated with four types of inner solution, that is, solution of inner barrel was filled with seawater, NaOH, thiourea, including parameters of amounts of NH4Cl(5,10,15 and 20g) and electrolysis experiment was carried out with applied current density at 20mA/cm2. For the best elimination effect of iron from flux solution, it is considered that inner barrel with separator should be filled with inner solution different from original flux solution which is involved in iron ion, and the inner solution should be composed with seawater added with additives such as NH4Cl(10g), NaOH(0.2 g) and thiourea(0.5g) when the applied current density by electrolysis method is 20mA/cm2.

Elimination Technology of the Iron Dissolved in Flux Solution of Hot Dip Galvanizing Process

2012 ◽  
Vol 472-475 ◽  
pp. 354-357
Author(s):  
Kyung Man Moon ◽  
Min Seok Oh ◽  
Dong Hyun Park ◽  
Myung Hoon Lee
Keyword(s):  
Structural Steel ◽  
Current Density ◽  
Manufacturing Process ◽  
Iron Ion ◽  
Applied Current ◽  
Applied Current Density ◽  
Dissolved Iron ◽  
Cost Of Production ◽  
The Cost

Hot dip galvanizing is being widely used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and for some other fields etc.. Recently, the cost of zinc is getting higher and higher, thus, a proper manufacturing process should be developed possibly to reduce the cost of production. one of hot dip galvanizing process, that is, flux solution immersion process is very important to control more effective coating. However, flux solution is deteriorated with increasing its using time because dissolved iron from structural steel due to continuous flux treatment was increasingly increased, which is resulted in coating badness and increment of dross. In this study, elimination of iron dissolved in flux solution was investigated with some types of inner solution which is added with additives such as seawater, NH4OH, NaOH, NH4Cl and thiourea, and electrolysis experiment was carried out with parameters of applied current density. For elimination of iron from flux solution, it is considered that inner barrel with separator should be filled with solution different from original flux solution which is involved in iron ion, that is, the inner solution which is made up seawater added with additives such as NH4Cl (5g), NaOH(0.5g) and thiourea(0.5g) is the most desirable solution to effectively extract iron from flux solution. An optimum applied current density for the most extraction effect of iron through electrolysis experiment is thought to be 20mA/cm2 .

Development of the Iron Elimination Technology of Acid Cleaning Solution of Hot Dip Galvanizing Process

2012 ◽  
Vol 472-475 ◽  
pp. 367-370
Author(s):  
Kyung Man Moon ◽  
Min Seok Oh ◽  
Jong Pil Won ◽  
Yun Hae Kim
Keyword(s):  
Acid Solution ◽  
Structural Steel ◽  
Current Density ◽  
Iron Ion ◽  
Applied Current ◽  
Applied Current Density ◽  
Dissolved Iron ◽  
Acid Cleaning ◽  
Cleaning Solution ◽  
The Cost

Hot dip galvanizing is being widely used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and for some other fields etc.. Recently, the cost of zinc is getting higher and higher, thus, a proper manufacturing process should be developed possibly to reduce the cost of production. one of hot dip galvanizing process, that is, acid cleaning process is very important to control more effective coating. However, acid solution is deteriorated with increasing its using time because dissolved iron from structural steel due to continuous acid cleaning was increasingly increased, and which is resulted in coating badness and increment of dross. In this study, elimination of iron dissolved in acid solution was investigated with some types of inner solution added with additives such as seawater, NH4OH, NaOH, NH4Cl and thiourea, and electrolysis experiment was carried out with parameters of applied current density. For elimination of iron from acid cleaning solution through electrolysis, it is considered that inner barrel with separator should be filled with solution different from original acid cleaning solution which is involved in iron ion, that is , the inner solution which is made up seawater added with additives such as NH4OH(10g) , NaOH(3.5g) and thiourea(0.5g) is the most desirable solution to effectively extract iron from acid cleaning solution. An optimum applied current density for the most extraction effect of iron through electrolysis experiment is thought to be 50mA/cm2 .

scholarly journals Methiocarb Degradation by Electro-Fenton: Ecotoxicological Evaluation

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5893
Author(s):  
Faléstine Souiad ◽  
Ana Sofia Rodrigues ◽  
Ana Lopes ◽  
Lurdes Ciríaco ◽  
Maria José Pacheco ◽  
...  
Keyword(s):  
Current Density ◽  
Iron Concentration ◽  
Model Organism ◽  
Anodic Current Density ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Applied Current Density ◽  
Toxic Units ◽  
Boron Doped ◽  
Ecotoxicological Evaluation

This paper studies the degradation of methiocarb, a highly hazardous pesticide found in waters and wastewaters, through an electro-Fenton process, using a boron-doped diamond anode and a carbon felt cathode; and evaluates its potential to reduce toxicity towards the model organism Daphnia magna. The influence of applied current density and type and concentration of added iron source, Fe2(SO4)3·5H2O or FeCl3·6H2O, is assessed in the degradation experiments of methiocarb aqueous solutions. The experimental results show that electro-Fenton can be successfully used to degrade methiocarb and to reduce its high toxicity towards D. magna. Total methiocarb removal is achieved at the applied electric charge of 90 C, and a 450× reduction in the acute toxicity towards D. magna, on average, from approximately 900 toxic units to 2 toxic units, is observed at the end of the experiments. No significant differences are found between the two iron sources studied. At the lowest applied anodic current density, 12.5 A m−2, an increase in iron concentration led to lower methiocarb removal rates, but the opposite is found at the highest applied current densities. The highest organic carbon removal is obtained at the lowest applied current density and added iron concentration.

Electrodeposition of Polyhedral Copper Crystals on Porous Silicon

2011 ◽  
Vol 181-182 ◽  
pp. 434-438
Author(s):  
Ming Meng ◽  
Yuan Ming Huang
Keyword(s):  
Porous Silicon ◽  
Current Density ◽  
Copper Chloride ◽  
Applied Current ◽  
Sem Images ◽  
Copper Crystal ◽  
Applied Current Density ◽  
Current Density Range ◽  
Tentative Explanation ◽  
Copper Crystals

Electrochemical deposition of copper from copper chloride aqueous electrolyte on porous silicon (PS) substrate was investigated in the current density range of 5 mA/cm2to 35 mA/cm2. Scanning electron microscopy (SEM) was utilized to characterize the surface morphology of as-electrodeposited PS. SEM images illustrate that the applied current density has a profound influence on the shape of copper crystal electrodeposited on the top surface of PS films. When the applied current density was fixed at 5mA/cm2, most of the copper crystals are in the shape of cube along with a small number of cuboid-shape. With the increasing current density, cuboid-shaped copper crystals gradually vanished. When the current density is up to the 35mA/cm2, we surprisingly observe that the cube shape predominates simultaneously with the emergence of truncated tetrahedron. A tentative explanation for the growth mechanism of copper crystal having various shapes is explored.

Investigation on the conductivity-dependent performance in low voltage cathodoluminescence

2015 ◽  
Vol 17 (15) ◽  
pp. 9936-9941 ◽  
Author(s):  
Chunyu Shang ◽  
Jinxian Zhao ◽  
Xiuqin Wang ◽  
Hongyang Xia ◽  
Hui Kang
Keyword(s):  
Current Density ◽  
Low Voltage ◽  
Generation Rate ◽  
Applied Current ◽  
Electron Hole ◽  
Phosphor Layer ◽  
Applied Current Density ◽  
Hole Generation

With the increase of applied current density in low voltage cathodoluminescence, the exciting power tends to saturate, causing the saturation of electron–hole generation rate in the phosphor layer.

Study of Forward Voltage Drift in Diffused SiC PiN Diodes Doped by Al or B

2005 ◽  
Vol 483-485 ◽  
pp. 989-992 ◽  
Author(s):  
S.I. Maximenko ◽  
Stanislav I. Soloviev ◽  
A.E. Grekov ◽  
A.V. Bolotnikov ◽  
Ying Gao ◽  
...  
Keyword(s):  
Current Density ◽  
Room Temperature ◽  
Stacking Faults ◽  
Applied Current ◽  
Forward Voltage ◽  
Pin Diodes ◽  
Applied Current Density ◽  
Voltage Drift ◽  
Significant Change ◽  
Degradation Testing

The degradation of diffused SiC PIN diodes during forward-biased operation was studied by first fabricating PIN diodes by diffusion of aluminum or boron into 4H-SiC substrates with n-type 10-15 µm thick epilayers doped by nitrogen up to 5x1015cm-3. The formed diodes were subjected to degradation testing under an applied current density of 200A/cm2 at room temperature. The majority of the Al diffused diodes demonstrated a voltage drift, ΔVf, of more than 2 V, while B-doped diodes showed no significant change in forward voltage. The EBIC mode of SEM was employed to monitor nucleation and expansion of stacking faults.

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