243 © Springer Nature Switzerland AG 2021 P. Cavaliere (ed.), Laser Cladding of Metals, https://doi.org/10.1007/978-3-030-53195-9_9 Chapter 9 Improving Wear and Corrosion Performance of AISI 316L Stainless Steel Substrate in Liquid Zinc by MoB/CoCr and MoB/CoTi Gas Tungsten Arc Clad Composite Coatings Hosein Ziaei, Zeinab Marfavi, Behzad Sadeghi, and Pasquale Cavaliere 9.1 Introduction The most common problem in galvanizing industries is failures of pot hardware facilities; the following three issues are the main contributors for these failures: (1) wear of supporting bearings in the stabilizer rolls and sink rolls, (2) corrosion of hardware facilities in molten zinc bath, and (3) the nucleation and presence of inter- metallic compounds formed on the surface of rolls (Liu et al. 2005). Submerged pot hardware is not only exposed to friction by strip, rollers, and severe wear due to rotation of zinc liquid, but it is also contaminated by molten zinc experiencing fric- tion and corrosion. These facilities lose their surface quality, and the liquid zinc gets polluted and results in reduction in quality of galvanized sheets. Due to these rea- sons, sink rolls have to be frequently replaced (Ren et al. 2007). Galvanizers must periodically stop continuous galvanizing lines (CGLs) to replace hardware compo- nents, resulting in signifcant economic losses with unplanned stoppages. Prolonging lifetime of hot-dip galvanizing equipment is a pivotal issue in these industries which would result in a decrease in frequency of line shutdowns and save lots of energy and costs for steel manufacturing factories (Yamaguchi and Hisamatsu 1979). Methods such as thermal spraying and plasma spraying have been largely inves- tigated, and they were able to increase the lifetime of sink rolls, but they have some H. Ziaei · B. Sadeghi State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China e-mail: b.sadeghi@sjtu.edu.cn Z. Marfavi Department of Material Engineering, Isfahan University of Technology, Isfahan, Iran P. Cavaliere (*) Department of Innovation Engineering, University of Salento, Lecce, Italy e-mail: Pasquale.cavaliere@unisalento.it