Mechanisms and influences of electro-brush plating micro-force on coatings performances
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efeng Liua) Laboratory of Advanced Processing Technology of Materials (LAPTM), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China; and Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Zhangzhi Shi Laboratory of Advanced Processing Technology of Materials (LAPTM), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China (Received 16 March 2016; accepted 25 April 2016)
Zn–Ni alloy coatings were deposited on rolled copper foil via electro-brush plating with different micro-force. Surface morphologies, microhardness, roughness, and bending performance were characterized. Mechanisms and influences of electro–brush plating micro-force on coatings performances were investigated and revealed. With the increase of electro-brush plating micro-force, surface morphologies of coatings become smooth and dense, and the grain size was refined. Microhardness of coatings had a gradually increasing tendency when the increasing amplification was reduced. However, surface roughness of coatings as well as bending performance increased firstly and then decreased. The mechanisms of micro-force generation and action were explained by mechanics theory and principle model. Plastic deformation and work hardening are generated and performances are improved. Consequently, the performance of electro-brush plating coatings has a tight relevance with micro-force.
I. INTRODUCTION
Electro-brush plating is a technology using electrolysis to implement coatings on metal surface. Compared with electroplating, electro-brush plating has many advantages on treating copper foil, such as simple and portable equipment, nondestructive anode,1 pollution-free, and stabilized character plating bath, efficient plating velocity, and easy realizable automation.2,3 Moreover, electrobrush plating can facilitate a high-performance coating to unification, denseness, and high binding capacity.4,5 Many researchers reported mechanisms and influences of electro-brush plating parameters on coating performances. Brush plating voltage, velocity, and time have significant influences on surface micromorphology, roughness, hardness, and density. Chen and Liu et al.6,7 prepared superhydrophobic nano composite coating on Q345 carbon steel via electro-brush plating, and studied influences of brush voltage, relative velocity, and time on surface micromorphology of Ni-nano composite coating.
Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.191
With the increase of voltage, the grains become finer, and the surface is more similar to the lotus leaf surface. However, with further increase of voltage, a large number of hydrogen and heat is produced, and the cathode polarization effect is more than a range. Coating becomes rough, loose,
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