scholarly journals Outstanding cracking resistance in Mg-alloyed zinc coatings achieved via crystallographic texture control

2022 ◽  
Vol 210 ◽  
pp. 114453
Author(s):  
Masoud Ahmadi ◽  
Bekir Salgın ◽  
Bart J. Kooi ◽  
Yutao Pei
Keyword(s):  
Crystallographic Texture ◽  
Cracking Resistance ◽  
Zinc Coatings

scholarly journals A Metallurgical Approach to the Cracking Resistance of Hot-Dip Galvanized Zinc Coatings

1996 ◽  
Vol 28 (1-2) ◽  
pp. 35-45 ◽  
Author(s):  
S. Lazik ◽  
C. Esling ◽  
M. J. Phillippe ◽  
J. Wegria ◽  
M. Dubois
Keyword(s):  
Slip Plane ◽  
Basal Plane ◽  
Deformation Behaviour ◽  
Cracking Resistance ◽  
Anisotropic Properties ◽  
Deformation Axis ◽  
Zinc Crystal ◽  
Zinc Coatings

The texture of zinc coatings influences to a large extent their formability, due to the anisotropic properties of zinc. The (0002) basal plane is the easiest slip plane in zinc crystal. Its inclination to the deformation axis and direction directly influences the deformation behaviour. This work deals with the effect of the texture and microstructure on the cracking behaviour of zinc coatings. For this purpose, twelve different commercial hot-dip zinc coatings have been studied.

RESTORATION OF MACHINE PARTS WITH GALVANIZED ZINC COATINGS

2020 ◽  
Vol 4 (141) ◽  
pp. 140-147
Author(s):  
MIKHAIL VIKHAREV ◽  
◽  
VLADIMIR YUDIN ◽  
VESELOVSKIY NIKOLAY ◽  
◽  
...  
Keyword(s):  
Current Density ◽  
Cathode Surface ◽  
Zinc Coating ◽  
Cathode Current Density ◽  
Research Purpose ◽  
Cathode Layer ◽  
Properties Of Coatings ◽  
Chemical Polarization ◽  
Cathode Current ◽  
Zinc Coatings

The article shows the role of electroplating in the restoration of parts, indicates the advantages of restoring parts with electroplating over other methods, and gives the characteristics and properties of coatings obtained by electroplating. (Research purpose) The research purpose is in increasing the speed of application of zinc electroplating when restoring parts. (Materials and methods) The cathode current density has a decisive influence on the coating speed. The main reason for limiting the cathode current density during galvanizing from sulfuric acid electrolytes is the chemical polarization of the cathode. The article presents a study on the designed installation for the application of galvanic coatings. When applying coatings to the internal surfaces of parts, there was used a device with activating elements having an electromechanical rotation drive. This device prevents depletion of the near-cathode layer of the electrolyte and reduces the chemical polarization of the cathode. Elements made of moisture-resistant skin were used as activators. (Results and discussion) The article presents the results of experiments as a dependence of the coating speed on the speed of the activator relative to the restoring surface. It also presents the relationship between the size of the abrasive grains of the activating elements, the force of their pressing against the cathode surface, the speed of movement of the activator and the speed of applying the zinc coating, as well as its quality. By activating the cathode surface, it was possible to raise the operating current density to 100-150 amperes per square decimeter. The speed of application of zinc coatings is 16-25 micrometers per minute. (Conclusions) In the course of research, authors determined the conditions of electrolysis during galvanizing, which provide a significant increase in the cathode current density and the rate of application of these coatings during the restoration of parts.

Influence of surface layers on resistance spot joinability of partially hardened steel 22MnB5 with aluminum-silicon and zinc coatings

2020 ◽  
Vol 64 (5) ◽  
pp. 755-771
Author(s):  
Oleksii Sherepenko ◽  
Vincent Schreiber ◽  
Iwan Schischin ◽  
Maximilian Wohner ◽  
Philipp Wernlein ◽  
...  
Keyword(s):  
Hardened Steel ◽  
Surface Layers ◽  
Resistance Spot ◽  
Zinc Coatings ◽  
Aluminum Silicon

scholarly journals Microstructure and Crystallographic Texture of Laser Additive Manufactured Nickel-Based Superalloys with Different Scanning Strategies

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 591
Author(s):  
Xingbo Liu ◽  
Hui Xiao ◽  
Wenjia Xiao ◽  
Lijun Song
Keyword(s):  
Additive Manufacturing ◽  
Epitaxial Growth ◽  
Crystallographic Texture ◽  
Continuous Wave ◽  
Flow Direction ◽  
Fiber Texture ◽  
Laves Phase ◽  
Solidification Structure ◽  
Columnar Grains ◽  
Scanning Strategies

Control of solidification structure and crystallographic texture during metal additive manufacturing is a challenging work which attracts the increasing interest of researchers. In the present work, two kinds of scanning strategies (i.e., single-directional scanning (SDS) and cross-directional scanning (CDS) were used to control the solidification structure and crystallographic texture during quasi-continuous-wave laser additive manufacturing (QCW-LAM) of Inconel 718. The results show that the solidification structure and texture are strongly dependent on scanning strategies. The SDS develops a typical fiber texture with unidirectional columnar grains, whereas the CDS develops a more random texture with a mixture of unidirectional and multidirectional grains. In addition, the SDS promotes the continuously epitaxial growth of columnar dendrites and results in the linearly distributed Laves phase particles, while the CDS leads to the alternately distributed Laves phase particles with chain-like morphology and discrete morphology. The changed stacking features of molten-pool boundary and the switched heat flow direction caused by different scanning strategies plays a crucial role on the epitaxial growth of dendrites and the final solidification structure of the fabricated parts.

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