Corrosion and Wear Properties of Zn-Based Composite Coatings
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JMEPEG https://doi.org/10.1007/s11665-020-04995-4
Corrosion and Wear Properties of Zn-Based Composite Coatings Ion-Dragos Utu, Roxana Muntean
, and Ion Mitelea
(Submitted March 6, 2020; in revised form June 3, 2020) Zn electroplated coatings are usually applied to protect the surface of steel components against corrosion. However, to increase their service life, improved mechanical properties of the coatings are required. The present study aimed to investigate the corrosion and sliding wear behavior of Zn electroplated composite coatings deposited onto the surface of a carbon steel substrate. The coatings were obtained by adding diamond and aluminum oxide suspensions in the base deposition bath. The morphology and microstructure of the coatings were characterized by confocal laser scanning microscopy and scanning electron microscopy, and the chemical composition was determined by energy-dispersive x-ray spectroscopy. The corrosion behavior was assessed by electrochemical measurements, and the sliding wear resistance was evaluated by pin on disk method. The results revealed that the addition of diamond and alumina particles in the zinc deposition bath had a positive influence on the tribological behavior of the coatings. Keywords
composite coatings, diamond/alumina particles, wear resistant coatings, Zn electrodeposition
1. Introduction Zinc coatings are commonly applied on steel components against corrosion, providing an excellent barrier protection from various aggressive atmospheres, acting as a sacrificial anodic layer (Ref 1, 2). Zinc-coated parts production is costeffective and involves easily accessible technologies (Ref 3). However, in some cases, zinc was found to be vulnerable in industrial pollutants, especially in strong acidic and alkaline environments. When exposed in such media, they tend to form typical white-rust corrosion products, which significantly reduce the lifetime of the component (Ref 4). Therefore, extensive studies have been lately conducted, to improve the corrosion resistance of zinc coatings, along with their mechanical and tribological properties. Metal-ceramic composite coatings, containing inert particles, have lately attracted great interest due to their outstanding characteristics (Ref 5, 6). Their special properties such as self-lubricity, high temperature inertness, improved hardness, better wear and corrosion resistance, low coefficients of thermal expansion and chemical and biological compatibility confer them several advantages compared to pure metal coatings (Ref 7). Therefore, the dispersed ceramic particles in a metallic matrix can replace conventional materials, offering a wide technological solution for various applications (Ref 8). Particularly, nanoparticles incorporation in a zinc metallic matrix has led to significant enhancement of corrosion resistance and better performance against abrasion and erosion compared to standard zinc coatings (Ref 7, 9). Nanoparticles like graphene oxide (Ref Ion-Dragos Utu, Roxana Muntean, and Ion Mitelea, University Politehnica Timisoar
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