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.

Influence of Surfactant on Electrochemical Process for Zn-Electrodeposition

2014 ◽  
Vol 1081 ◽  
pp. 53-57
Author(s):  
Dao Bing Huang ◽  
Yuan Qiang Tu ◽  
Jie Cai ◽  
Guan Wen Feng ◽  
Xing Peng Guo
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrogen Evolution ◽  
Reduction Potential ◽  
Steel Substrate ◽  
Electrochemical Process ◽  
Zinc Deposition ◽  
Sodium Dodecylbenzenesulfonate ◽  
Electrodeposition Process ◽  
Sulphate Bath ◽  
Acidic Sulphate

The electrodeposition of zinc from acidic sulphate bath on steel substrate has been studied. The influence of sodium dodecylbenzenesulfonate (SDBS) as surfactant on the mechanism of the electrodeposition process has been investigated using potentiodynamic and cyclic voltammetry (CV) techniques. From the analysis of CV analysis, it is shown that in the surfactant free bath solution, hydrogen evolution occurs together with the zinc deposition. The presence of SDBS shifts the reduction potential of Zn2+ to more negative values, indicating that SDBS to some extent hinder the Zn electrodeposition.

scholarly journals The Characterization of Co-Ni-Fe Coating in Different pH Environment

2019 ◽  
Vol 8 (4) ◽  
pp. 6950-6955
Keyword(s):  
Ph Value ◽  
Strong Acid ◽  
Alloy Coating ◽  
Weak Acid ◽  
Corrosion Performance ◽  
High Corrosion Resistance ◽  
Electrodeposition Process ◽  
High Microhardness ◽  
Coating Alloy

This study aims to produce a Co-Ni-Fe alloy coating on a mild steel hollow cylinder shape by electrodeposition process and analyze the effect of different pH on the corrosion performance of the alloy coating. During the electrodeposition process, the temperature and time are set to 50°C and 30 minutes, respectively. Different pH value consisting of pH 2.1 (strong acid), 5.2 (weak acid), 6.9 (neutral), 8.4 (weak alkali) and 12.3 (strong alkali) are used. From the results obtained it was found that the deposited Co-Ni-Fe alloy has excellent corrosion performance. Corrosion rate obtained for strong acid, weak acid, neutral, weak alkali and strong alkali are 5.88 mmpy, 2.95 mmpy, 1.17 mmpy, 2.16 mmpy and 5.72 mmpy, respectively. Hence this studied showed that Co-Ni-Fe coating alloy could be used as an alternative to prevent against corrosion due to its high corrosion resistance as well as high microhardness.

scholarly journals Did people really drink bleach to prevent COVID-19? A tale of problematic respondents and a guide for measuring rare events in survey data

2020 ◽  
Author(s):  
Leib Litman ◽  
Zohn Rosen ◽  
Cheskie Rosenzweig ◽  
Sarah L. Weinberger-Litman ◽  
Aaron J. Moss ◽  
...  
Keyword(s):  
Public Health ◽  
Best Practices ◽  
Health Outcomes ◽  
Survey Research ◽  
Iron Content ◽  
Heart Attack ◽  
Public Health Research ◽  
Similar Rate ◽  
The Impact ◽  
The Relationship

AbstractSociety is becoming increasingly dependent on survey research. However, surveys can be impacted by participants who are non-attentive, respond randomly to survey questions, and misrepresent who they are and their true attitudes. The impact that such respondents can have on public health research has rarely been systematically examined. In this study we examine whether Americans began to engage in dangerous cleaning practices to avoid Covid-19 infection. Prior findings reported by the CDC have suggested that people began to engage in highly dangerous cleaning practices during the Covid-19 pandemic, including ingesting household cleansers such as bleach. In a series of studies totaling close to 1400 respondents, we show that 80-90% of reports of household cleanser ingestion are made by problematic respondents. These respondents report impossible claims such as ‘recently having had a fatal heart attack’ and ‘eating concrete for its iron content’ at a similar rate to ingesting household cleaners. Additionally, respondents’ frequent misreading or misinterpreting the intent of questions accounted for the rest of such claims. Once inattentive, mischievous, and careless respondents are taken out of the analytic sample we find no evidence that people ingest cleansers to prevent Covid-19 infection. The relationship between dangerous cleaning practices and health outcomes also becomes non-significant once problematic respondents are taken out of the analytic sample. These results show that reported ingestion of household cleaners and other similar dangerous practices are an artifact of problematic respondent bias. The implications of these findings for public health and medical survey research, as well as best practices for avoiding problematic respondents in surveys are discussed.

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
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