A Novel Approach to the Synthesis of Alloy: PEG 400 Containing ZnNi and ZnNiCr Alloy Coatings and Their Anticorrosion Pe
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NTRODUCTION
IN industry, mild and stainless steel have been widely used as iron-based metals in numerous applications for many years. Corrosion of the oxidizable metals has become one of the most important problems of the world. Corrosion is generally defined as the gradual destruction of oxidizable metals or their alloys by chemical reaction with their environment. Oxidizable metals are coated to protect them against corrosion, using two basic mechanisms including sacrificial and barrier protection. Therefore, protective deposits, such as silicones, conducting polymers, inorganic compounds, and metal or alloy, have been widely used for substrate corrosion control.[1–16] Zinc coating obtained for cathodic protection as a sacrificial anode is applied as one of the many important ways of corrosion protection of oxidizable metals such as mild and carbon steel (CS). Yet, Zn coating for corrosion resistance is not enough due to the permanent need of industry to decrease coating thickness and to increment corrosion resistance at the same time. The use of zinc-based alloys to increase the corrosion protection of CS has grown worldwide in recent years. Although Zn plating provides cathodic protection, generally, zinc-based alloy-coated
A. TUNCAY OZYILMAZ, M. KEMAL SANGUN, IBRAHIM FILAZI, CAGLA SURMELIOGLU, and GUL OZYILMAZ are with the Department of Chemistry, Faculty of Arts & Sciences, University of Hatay Mustafa Kemal, 31000 Hatay, Turkey. Contact e-mail: [email protected] Manuscript submitted September 21, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
layers lead the anodic protection on the base metal.[17–20] On the other hand, Zn-Ni alloys coated by electrochemical technique have important corrosion resistance, improved mechanical properties, and better thermal stability when compared to other zinc alloy coatings.[21,22] In response to rising warranty periods in the automotive industry, in addition to zinc and low zinc alloys, zinc-nickel coating, which provides five times higher corrosion resistance than zinc and low zinc alloys (zinc-cobalt, zinc-iron), has become an indispensable alternative today.[23,24] In the industrial area, metallic plating surfaces deposited by zinc or nickel-based metal or alloy are still coated with thin chromate or phosphate passive layers, thus improving the corrosion protection of these platings.[24–33] On the other hand, a polyethylene glycol (PEG) component is currently used in several areas such as pharmacological, cosmetic, and biomedical applications and batteries. At the same time, the PEG component, which is a corrosion inhibitor for oxidizable metal or alloys in abrasive media, has been proven to decrease the corrosion rate (CR) in sulfuric and hydrochloric acid solutions by decreasing pitting corrosion. Consequently, the contribution of PEG is mostly related to its adsorption on the surface of oxidizable metals, thus blocking/limiting the physical contact between the corrosive types and the metal.[34–45] This study aims to electrochemically synthesize ZnNi and ZnNiCr alloy co
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