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Sprayed Coatings
Published in Frank Porter, Zinc Handbook, 1991
For corrosion protection of steel only zinc, aluminium and alloys of these two metals have the right combination of protective properties and reasonable cost for general application. Lead coatings are used when a particularly inert coating is required for acid sulphurous environments and they also have some decorative appeal. There is little or no justification for sprayed cadmium or other metals to protect steel.
Tribological behavior of ZA27/Al2O3/graphite hybrid nanocomposites
Published in Particulate Science and Technology, 2018
Onur Güler, Hamdullah Çuvalcı, Mahir Gökdağ, Aykut Çanakçi, Müslim Çelebi
Zinc–aluminum alloys used as metal matrices are more feasible, excellent, inexpensive, and have lower melting point than cast iron, brass or aluminum alloy. They also offer good tribological properties and excellent pressure tightness. Among the zinc-based foundry alloys, especially, ZA27 alloy is used in bearings and bushing applications instead of bronze bearings because it has low cost and superior bearing performance (Seah et al. 1996). It is considered that the ZA27 alloy has the most potential to obtain the composites because it is convenient as a substrate for various techniques of composites manufacturing (Miloradović and Stojanović 2013). The mechanical milling process can be used to refine the microstructure and provide the homogeneous dispersion of ceramic reinforcements in the metallic matrix within powder metallurgy (Iacob et al. 2015). This method can be used to produce large quantities of materials as inexpensive. Thus, it is a well-known technique to produce advanced materials such as amorphous alloys and nanocomposites (Gu 2006).
Cheon-Sa Bridge—The First Sea Crossing Multi-Span Suspension Bridge
Published in Structural Engineering International, 2021
Yunki Son, Changsun Lee, Dongho Yoo, Jungin Kim, Jinhyuk Choi
The three typical improvements in cable system planning are ① zinc + aluminium coating, ② rubber wrapping, and ③ concrete tower saddle. Firstly, compared to the existing galvanized wire method, zinc+ aluminium coating has superiority of 1.4 times longer fatigue life and 4 times higher corrosion resistance. This coating enhances the life expectancy of the main cable along with the dehumidification system.
Anisotropic Dry Sliding Friction and Wear Properties of a Novel Stainless Steel/ZA8 Alloy Interpenetrating Phase Composite Produced by Squeeze Casting
Published in Tribology Transactions, 2020
Bibo Yao, Zhaoyao Zhou, Zengtao Chen, Junwen Wang
Metal matrix composites (MMCs) combine the properties of raw materials and are favored with superior properties such as higher stiffness and strength and tribological properties (Kaslioglu and Akbulut (1)). The reinforcing phases can be in the form of continuous, discontinuous, or chopped fibers, particles, or whiskers (Zhou, et al. (2)). An interpenetrating phase composite (IPC) is a kind of composite with a network structure of 3D interconnectivity of both phases (Cheng, et al. (3)). IPCs have been demonstrated to have better strength and wear resistance than traditional composites (Ahlatci, et al. (4); Liu, et al. (5)). Currently, investigations about metal matrix IPCs are mainly focused on ceramic reinforcements (Miyajima and Iwai (6); Cree and Pugh (7); Wang, et al. (8)). Ceramic-reinforced MMCs provide high hardness, high specific strength, and good wear resistance but with a decrease in ductility and toughness and wetting problems between the reinforcement and matrix alloy (Landry, et al. (9)). Metal reinforcements provide a good way to solve this problem (Zhou, et al. (2)). Zinc–aluminum (ZA)-based cast alloys have excellent castability and wear resistance and good mechanical properties (Sharma, et al. (10); Mojaver and Shahverdi (11); Zhu, et al. (12)). In the automotive industry, some low-load components are fabricated using commercial zinc alloys, like small gears, gear racks, pulleys, etc. In other applications, like gearboxes, the more expensive copper alloys can be replaced by zinc alloys (Sharma, et al. (10); Pola, et al. (13)). However, major limitations of the application of zinc alloys are their inferior mechanical and wear properties at temperatures above 100 °C (Prasad (14)). Particles, whiskers, and fibers as reinforcements are used to improve the dimensional stability and wear resistance of Zn-Al alloys at elevated temperatures (Sharma, et al. (15); Prasad (16); Sahin (17)). In order to extend the application of zinc alloy used as wear-resistant parts, it is necessary to fabricate a metal/zinc alloy IPC that can withstand high temperature via an economic method and to understand their friction and wear behavior.