scholarly journals Application of Bonded Joints for Quantitative Analysis of Adhesion

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Jarmila Trpčevská ◽  
Mária Kollárová ◽  
Eva Zdravecká ◽  
Jana Tkáčová
Keyword(s):  
Steel Substrate ◽  
Zinc Coating ◽  
Experimental Tests ◽  
Coated Steel ◽  
Bonded Joints ◽  
Steel Sheets ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
Peel Tests

The performance of hot-dip coated steel sheets is associated with properties of the zinc coatings on steel substrate. For the characterization of the adhesion behaviour of zinc coating on steel various tests were employed. The study was focused on quantification assessment of galvanized coating adhesion to substrates. Methods for evaluation of the bonding strength of zinc coating by the shear strength and the T-peel tests applying four special types of adhesives were used. The experimental tests of bonded joints show that the adhesion of the zinc coating to the substrate was higher than that of the applied adhesive with the highest strength.

Interface Microstructure and Adhesion of Zinc Coatings on TRIP Steels

2007 ◽  
Vol 539-543 ◽  
pp. 1104-1109 ◽  
Author(s):  
G.M. Song ◽  
Willem G. Sloof ◽  
T. Vystavel ◽  
Jeff T.M. de Hosson
Keyword(s):  
Trip Steel ◽  
Tensile Deformation ◽  
Steel Substrate ◽  
Zinc Coating ◽  
Galvanized Steel ◽  
Interface Fracture ◽  
Inhibition Layer ◽  
Steel Sheets ◽  
Intermetallic Particles ◽  
Zinc Coatings

Hot-dip galvanized transformation induced plasticity (TRIP) steel sheets were recently developed for automotive applications. The microstructure and the adhesion of zinc coated CMnSi TRIP steel alloyed with P were studied. The α-Zn coating adjacent to the steel substrate consists of a continuous η-Fe2Al5-xZnx inhibition layer with columnar ζ-FeZn13 intermetallic particles on top. Along the interface between the inhibition layer and the steel substrate Mn/Mn-P oxides were frequently observed. Although these oxides at the steel surface reduce the adhesion between the zinc coating and the TRIP steel, they do not cause any bare spots during galvanizing. Upon tensile deformation of the galvanized steel sheet, cracking along the α-zinc grain boundaries preceded fracture of the interface between the α-Zn layer and the inhibition layer. After 4 % deformation the average interface crack length increased linearly with the applied strain. This interface fracture was strongly influenced by the crystalline orientation of the α-Zn grains.

Study of the Temperature Effect on the Structure and Thickness of Hot-Dip Zinc Coatings on Fixing Products

2014 ◽  
Vol 698 ◽  
pp. 355-359 ◽  
Author(s):  
Olga Bondareva
Keyword(s):  
Coating Thickness ◽  
Elevated Temperatures ◽  
Zinc Coating ◽  
High Strength ◽  
Bath Temperature ◽  
X Ray ◽  
Minimal Thickness ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
Scanning Electron

Hot-dip galvanizing of steels is usually performed by immersing the metal in a bath with molten zinc in the temperature range from 450 to 460 °C. In some cases it is necessary to obtain a minimal coating thickness. For example, high-strength bolts and other fixing products require a minimal thickness of the coating because a too thick zinc coating requires additional work on re-threading, which leads to spalling of coatings, a loss of corrosion resistance and, consequently, failure of the entire product. The main aim of this work was to study the influence of elevated temperatures of hot-dip galvanizing on the thickness and microstructure of zinc coatings on bolts and nut preform. The microstructure and elemental composition of the coating were studied by scanning electron microscopy and energy dispersion X-ray microanalysis. It was found that the coating thickness obtained in the range between 475 and 535°C decreases with temperature and reaches a minimum at 535°C. The structure of the coating after high-temperature hot-dip galvanizing was fundamentally different from the structure of the coating made at standard temperatures 450-460°C. This coating formed at 535°C was dense, homogeneous, non-porous and composed of a mixture of the δ and ζ-phases without distinct phase boundaries. That’s why it was recommended to maintain the bath temperature in the range between 533°C and 537°C. It allows us to obtain a hot-dip galvanized coating of a minimal thickness and a good quality on fixing products.

EM of hot-dip zinc-iron (galvannealed) coatings

1990 ◽  
Vol 48 (4) ◽  
pp. 1036-1037
Author(s):  
J.D.L 'Ecuyer ◽  
M. Gagné ◽  
C.C. Cheng ◽  
G.L. 'Espérance
Keyword(s):  
Automotive Industry ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Steel Product ◽  
X Ray ◽  
Steel Sheets ◽  
Coating Microstructure ◽  
The Individual ◽  
Zinc Coatings

Galvannealed coatings have superior weldability and paintability characteristics than conventional zinc coatings. As a result, the market for galvannealed steel sheets is steadily increasing especially in the automotive industry. The formation of the brittle intermetallic Zn-Fe phases, Γ, Γ1, δ, and Z also affects the for- mability properties of the coated steel product. In order to minimize powdering and flaking, the microstructure of the coating must be closely controlled.The characterization of the galvannealed coating microstructure is essential but has proven to be quite difficult. The individual phases cannot be resolved using optical microscopy. X-ray diffraction appears promising, however some of the intermetallic phases are too thin to produce a detectable signal. Electrochemical stripping has been used, but phase identification is ambiguous. Direct observation of the phases using electron microscopy appears to be the best method for characterizing these coatings.

scholarly journals Characterization of yield criteria for zinc coated steel sheets using nano-indentation with knoop indenter

2020 ◽  
Vol 381 ◽  
pp. 125110 ◽  
Author(s):  
Tanmaya Mishra ◽  
Matthijn de Rooij ◽  
Meghshyam Shisode ◽  
Javad Hazrati ◽  
Dirk J. Schipper
Keyword(s):  
Coated Steel ◽  
Yield Criteria ◽  
Nano Indentation ◽  
Steel Sheets ◽  
Zinc Coated Steel ◽  
Knoop Indenter

Use of Zinc-Alloys for Low Temperature Soldering of Zinc Coated Steels

2005 ◽  
Vol 6-8 ◽  
pp. 127-134 ◽  
Author(s):  
J. Wilden ◽  
Jean-Pierre Bergmann ◽  
M. Dolles ◽  
Sebastian Reich
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
Zinc Coating ◽  
Tensile Tests ◽  
Filler Materials ◽  
Coated Steel ◽  
Zinc Alloys ◽  
Steel Sheets ◽  
Process Reliability ◽  
Zinc Coated Steel

Zinc coated steels are nowadays used for different applications as for example for household appliances, automotive or offtakes. Due to the boiling temperature of zinc (907°C), which is lower than the steel melting point, the welding of zinc coated steel sheets presents many difficulties. As a result of the violent evaporation of zinc, pores in the weld seam are present after solidification and the zinc coating near the weld is damaged. Brazing of zinc coated steels with CuSi-alloys offers some advantages, as the joining temperature is about 950-1000°C. Nevertheless the high melting point of these filler materials requires very restricted process strategies and damaging of the zinc coating near the brazing seam can’t be avoided. Although laser-, plasma- and MIG-joining with CuSi and CuAl are performed nowadays. ZnAl-alloys are characterized through low melting temperature, which are comparable to the melting point of zinc, so that the damaging of the zinc coating can be reduced. In this paper investigations carried out with ZnAl-materials for joining zinc coated steel sheets as DC04ZE75/75 and DX56Z (thickness 0,9 mm) are reported. First investigations were performed by resistance spot soldering and show that using low temperature melting materials leads to a lower damaging of the zinc coating. Further the process reliability of laser soldering with ZnAl-alloys and a Nd:YAG as well as a diode laser is reported and confirms the suitability of these alloys for a damaging free joining zinc coated steels. The low surface tension leads to a wide bearing section, so that advantageous properties are expected. The mechanical properties of edge welds are evaluated in this paper through tensile tests as well.

The Impact of Zinc Coating Specifications on Corrosion Resistance аnd Durability of Steels

2019 ◽  
Vol 945 ◽  
pp. 740-745
Author(s):  
I.A. Kovalenko ◽  
D.V. Laskin ◽  
A.Y. Trifonova
Keyword(s):  
Corrosion Resistance ◽  
Statistical Analysis ◽  
Chemical Composition ◽  
Service Life ◽  
Zinc Coating ◽  
Useful Life ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
The Impact ◽  
High Chloride

The article contains the findings on impact of zinc coating specifications on corrosion resistance and service life of steels of various chemical composition used often in modern industries. Characteristics such as type, class, chemical compound and thickness of zinc-based coatings are also addressed. Experiments were performed in which corrosion rate and useful life of zinc coatings in probable operating-like conditions — i.e., in environments of varying degrees of corrosive power (humid and high-chloride environments) were determined. It has been established which one of the environments is the most corrosive for steels depending on the zinc-based coatings’ specifications. Qualitative (visual) and quantitative (gravimetric) assessment of corrosion resistance and service life of chosen steels is presented. Optimal hot dip galvanized coating specifications were determined using statistical analysis.

Formability Evaluation of Coated and Uncoated Steel Sheets with Consideration of Frictional Characteristics

2007 ◽  
Vol 340-341 ◽  
pp. 581-586
Author(s):  
Dae Cheol Ko ◽  
Kyoung Su Lee ◽  
Jung Min Lee ◽  
Byung Min Kim
Keyword(s):  
Mechanical Properties ◽  
Zinc Coating ◽  
Fe Analysis ◽  
Automotive Application ◽  
Coated Steel ◽  
Frictional Properties ◽  
Steel Sheets ◽  
Drawing Test ◽  
Uncoated Steel ◽  
Cup Drawing

Galvannealed steel sheets are being widely used in automotive application for better corrosion resistance. It is generally known that uncoated steel sheets have better mechanical properties than coated steel sheets due to presence of zinc coating. But frictional characteristics of coated steel sheets are very different from those of uncoated steel sheets. Therefore the study on mechanical and frictional characteristics of these steel sheets is needed. In this study, tensile test was performed to evaluate mechanical properties of coated and uncoated steel sheets. Cup drawing test was performed to measure friction-coefficient. And frictional characteristics were analyzed by using FE-analysis. The effect of mechanical and frictional properties on cup drawing was investigated. It was shown that the frictional properties more affected cup drawing.

Pulse reverse electrodeposition and characterization of nanocrystalline zinc coatings

RSC Advances ◽  
2014 ◽  
Vol 4 (94) ◽  
pp. 52562-52570 ◽  
Author(s):  
Qingyang Li ◽  
Zhongbao Feng ◽  
Jinqiu Zhang ◽  
Peixia Yang ◽  
Fenghuan Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Zinc Coating ◽  
Mechanical Wear ◽  
Sulfate Bath ◽  
Wear And Corrosion ◽  
Pulse Reverse ◽  
Wear And Corrosion Resistance ◽  
Zinc Coatings

A nanocrystalline zinc coating is produced by pulse reverse electrodeposition in a sulfate bath with polyacrylamide as the only additive and the mechanical, wear and corrosion resistance properties are evaluated.

scholarly journals Electrochemical Characterization of Different Layers of Composite Incorporated Hot-Dip Zinc Coating

2020 ◽  
Vol 32 (6) ◽  
pp. 1370-1378
Author(s):  
S.R. Arunima
Keyword(s):  
Electrochemical Impedance ◽  
Zinc Coating ◽  
Corrosion Current ◽  
Open Circuit ◽  
Nano Tio2 ◽  
Corrosion Resistant ◽  
Polarization Studies ◽  
The Stability ◽  
Zinc Coatings

The present study beneficially explores nano TiO2 incorporated hot-dip zinc coatings for the enhanced corrosion protection of steel. Various electrochemical analyses such as open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies were adopted to evaluate the enhanced galvanic performance and the stability of nano TiO2 composite incorporated coatings. The low corrosion current density and high polarization resistance of tuned composition of TiO2 incorporated hot-dip zinc coatings confirm its enhanced galvanic and corrosion resistant properties. The enhanced performance of TiO2 incorporated zinc coating was attributed to the combined effect of barrier and sacrificial behaviours.

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