Influence of zinc sulfate concentration in baths on the structure, morphology and tribocorrosion properties of Fe-Zn alloy coating

2021 ◽  
pp. 127561
Author(s):  
Ziyu Liu ◽  
Yang Yang ◽  
Xuejia Yang ◽  
Bingsuo Pan
Keyword(s):  
Zinc Sulfate ◽  
Alloy Coating ◽  
Sulfate Concentration ◽  
Structure Morphology ◽  
Zn Alloy

Study on Manufacturing Process and Applying of Galvalume

2011 ◽  
Vol 704-705 ◽  
pp. 1406-1409
Author(s):  
Meng Song ◽  
Yun Li Feng ◽  
Jing Bo Yang
Keyword(s):  
Annealing Treatment ◽  
Alloy Coating ◽  
Alloy Layer ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Elongation ◽  
Coated Surface ◽  
Short Time ◽  
Zn Alloy ◽  
Thermal Simulation Experiment

Annealing and dip galvanizing treatments of Galvalume were studied by using methods of Gleeble thermal simulation experiment and optical microscopy (OM), scanning electronic microscopy (SEM), X-ray energy dispersive analysis (EDAX), X-ray diffraction (XRD) and so on. Meanwhile, surface morphology, microstructure, phases and the respective compositions of Al-Zn alloy coating plate were analyzed. The results show that decreased rate and prolonged time of annealing treatment cause less effect on process ability of product, which all because of the short time of annealing process in continuous aluminum-zinc treatment. However, coarse grain which causes low strength, high elongation and r value occurs when rising annealing temperature. To get better coated surface, in-zinc pot temperature should be controlled in the range of 590~610°C, and height of air-knife nozzle should be kept in the range of 150~200mm. Surface layer of 55％Al-Zn alloy coating is covered by Al-Zn alloy, the intermediate alloy layer is consisted of binary and ternary compounds, such as θ phase (FeAl3), Al0.3Fe3Si0.7 and Al3.21Si0.47. Keywords: Galvalume, Process, Microstructure, Properties

The Mechanism of Dross Formation during Hot-dip Al-Zn Alloy Coating Process

2013 ◽  
Vol 13 (1-2) ◽  
Author(s):  
Qun Luo ◽  
Feng Jin ◽  
Qian Li ◽  
Jie-Yu Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Alloy Coating ◽  
Coating Process ◽  
Dross Formation ◽  
Zn Alloy

Influence of Cold Rolling Process on Mini Spangle Formation of 55%Al-Zn Alloy Coating Steel Sheet

2018 ◽  
Vol 936 ◽  
pp. 171-177
Author(s):  
Tai Xiong Guo ◽  
Xue Qiang Dong ◽  
Chang Rong Ran
Keyword(s):  
Cold Rolling ◽  
Steel Sheet ◽  
Steel Substrate ◽  
Steel Strip ◽  
Alloy Coating ◽  
Compound Layer ◽  
Rolling Process ◽  
Intermetallic Compound Layer ◽  
Rolling Oil ◽  
Zn Alloy

According to that mini spangle is the most common defect affecting the appearance quality of hot-dip 55%Al-Zn alloy coated steel sheet, industrial experiments and statistical analysis were done to investigate the influence of cold rolling process on the formation of mini spangle. The results show that, with the decrease of rolling oil concentration, the increase of rolling time, and the increase of rolling pass, the probability of mini-spangle formation increases. Due to the different equipment conditions, the probability of mini-spangle formation on the upper and lower surfaces of steel strip is different. The reason of mini-spangle formation lies in the presence of carboxylates (R-COO-Fe) result from the residual emulsion on the surface of cold rolled steel strip. The carboxylates may interfere with the interfacial reaction between the steel substrate and Al-Zn bath, and result in more convex Fe5Si2Al20 phases formed on the surface of intermetallic compound layer. The Fe5Si2Al20 phases may provide more heterogeneous nucleation sites for the formation of Al-rich dendrites and lead to the formation of mini spangle.

Analysis and Calculation of Electrodeposition Process of Zn Alloy Coatings

2010 ◽  
Vol 139-141 ◽  
pp. 386-389
Author(s):  
Yun Ying Fan ◽  
Dong Hua Chen ◽  
Xiao Jing Liu
Keyword(s):  
Iron Content ◽  
Alloy Coating ◽  
Corrosion Performance ◽  
Electrodeposition Process ◽  
Real Concentration ◽  
Sulphate Bath ◽  
The Relationship ◽  
Zn Alloy ◽  
Acidic Sulphate ◽  
Ferrous Complex

Electrodeposited Zn-Fe alloy coating has good anti-corrosion performance and has been widely applied to protect steel materials from corrosion. In this paper, Zn-Fe alloy coatings were plated from acidic sulphate bath, and the relationship between real concentration of metallic complexes ([ZnL+] and [FeL+]) in the bath, which was calculated through solving nonlinear equations by METLAB software, and components of alloy coatings was studied. When ZnSO4•7H2O added in the bath increases from 10 g/L to 50 g/L, the ratio of ferrous complex to total complex decreases from 81.96% to 46.76%, simultaneously the iron content in Zn-Fe alloy coatings decreases from 26.82% to 6.32%. As FeSO4•7H2O and (NH4)2SO4 added in the bath increases from 40 g/L to 80 g/L respectively, the ratio of ferrous complex to total complex increases from 50.02% to 66.23% and from 58.65% to 60.37% respectively, simultaneously the iron content in coatings increases from 8.26% to 13.77% and from 9.28% to 11.92% respectively. The results show that variation of concentration of metallic complexes in the bath can lead to variation of components of coating proportionally.

Fe-Zn Alloy Coating on Galvannealed (GA) Steel Sheet to Improve Product Qualities

2014 ◽  
Vol 23 (9) ◽  
pp. 3336-3346 ◽  
Author(s):  
Debabrata Pradhan ◽  
Akshya Kumar Guin ◽  
Pankaj Raju ◽  
Manindra Manna ◽  
Monojit Dutta ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Alloy Coating ◽  
Improve Product ◽  
Zn Alloy

Influence of Rare Earth on Hot-Dipped 55%Al-Zn Alloy Coating

2013 ◽  
Vol 774-776 ◽  
pp. 1132-1136 ◽  
Author(s):  
Tai Xiong Guo ◽  
Xue Qiang Dong ◽  
Shu Hui Deng ◽  
Feng Li ◽  
Yi Lin Zhou
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Simulation Experiment ◽  
Steel Substrate ◽  
Intermetallic Layer ◽  
Alloy Coating ◽  
Al Alloy ◽  
Zinc Dross ◽  
Zn Alloy ◽  
The Rare Earth

Simulation experiment was done to investigate the effects of rare earth on hot-dipped Zn-55%Al alloy coating. The results show that the rare earth has little effect on the zinc dross and its burning loss is about 10%. The microstructure of coating is similar to that of solidification bath, and which is made up of phases of rich aluminum, rich zinc, rich silicon and rare earth, and intermetallic layer of Al-Zn-Fe-Si. The rare earth phase is needle or rod, and mainly distributed inside rich zinc phase and on the interface between the coating and steel substrate. The rare earth has no obvious influence on coating grain and spangle size. The appropriate addition of rare earth would be helpful to improve the coating bending formability and corrosion resistance.

Preparation of Ni-Co Alloy by Electrodeposition

2014 ◽  
Vol 525 ◽  
pp. 58-61
Author(s):  
Yusrini Marita ◽  
Ridwan ◽  
Satri Nanda ◽  
Nurdin
Keyword(s):  
Current Density ◽  
Low Cost ◽  
Alloy Coating ◽  
Grain Structure ◽  
Cobalt Alloy ◽  
Nickel Cobalt ◽  
Structure Morphology ◽  
Ni Alloy ◽  
Current Densities ◽  
Composition Structure

Nickel-cobalt alloy coatings were prepared on copper substrates by electrochemical deposition at various deposition current densities of 10, 20, 30, 40 and 50 mA cm-2. Ni-Co alloy coating have been prepared by elecrodeposition technique due its low cost, easily maintainable equipment, easy control of film thickness and the method is also environmentally friendly. The effect of current density on deposit composition, structure, morphology and microhardness of electrodeposited Co-Ni alloy deposits were studied and discussed. The values of the current efficiency obtained are in the range of 68 95 %. From surface morphology obtained the current density increasing promotes the formation colony structure. Increasing the current density led to finer grain structure in Ni-Co deposit. The microhardness of electrodeposited Ni-Co coatings are in the range 482-610 HV.

On-farm methods for assessing zinc sulfate concentrations in footbaths

1992 ◽  
Vol 32 (1) ◽  
pp. 15 ◽  
Author(s):  
GR Ferrier ◽  
LC Bowditch ◽  
TJ Makin
Keyword(s):  
Soil Water ◽  
Zinc Sulfate ◽  
Colour Change ◽  
Practical Method ◽  
Sulfate Concentration ◽  
Sulfate Solutions ◽  
On Farm

An hydrometer and a titrimetric colour change method were compared as 2 on-farm tests for assessing the strength of zinc sulfate in footbaths used for the control of footrot in sheep. Contamination of zinc sulfate solutions with soil, water, and sheep faeces and urine reduced initial concentrations by up to 33%; however, zinc sulfate concentration could be still assessed by the 2 methods. The hydrometer was found to be the most practical method for on-farm use.

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