An Anticorrosion Coating from Ball-milled Wood Charcoal and Titanium Dioxide using a Flame Spray Method

Abstract

In coating technology, many coating methods have been developed to enhance metal's resistance to corrosion. This study demonstrated the use of a simple, easy, and economical manual thermal flame spray method to create an anticorrosion coating layer composed of ballmilled wood charcoal (a readily-available source of carbon) and titanium dioxide (TiO2). The coating materials were sprayed and melted by passing them through a flame; they were then deposited onto the surface of metal substrate of structural steel (SS) 400. We observed that the surface layers of the substrate sprayed with the wood charcoal-TiO2 mixture contained deposits such as titanium carbide, as a result of the carbothermal reduction reaction between TiO2 and the carbon present in the wood charcoal, and other iron carbide and titanium-iron oxide compounds. This deposit layer may explain why this substrate also exhibited a microhardness of more than twice that of the uncoated substrate. The coated substrate shows a darker shade than the uncoated substrate. The observation under optical microscopes shows that the uncoated metal substrate has a rougher surface with many more voids than the coated substrate. The coated surface has a water contact angle of ~107 o indicating that a hydrophobic surface can be maintained. The coated substrates also demonstrated greater corrosion resistance to both acid and water, with the wood charcoal-TiO2-coated substrate demonstrating the best performance; in fact, its corrosion rate was nearly three times slower than that of the uncoated substrate.

Investigation of the Properties of Metallurgical Slags and Dust of Electro Filters to Obtain Protective Anticorrosive Coatings

“…X-ray analysis also revealed traces of augite -Ca [Mg, Fe 2+ , Al, Fe 3+ (Si, Al)2O6] (d = 1.41; 1.32; 1.07). Segregation is significant in the crystallization process because it accelerates under certain ideal conditions (Sycheva, 2016(Sycheva, , 2017(Sycheva, , 2019Sycheva & Poljakova, 2013Saraswati et al, 2018). Figure 4 shows delamination that occurred during the heat treatment.…”

“…Steel structures in agricultural construction are subject to severe corrosion damage due to high concentrations of animal waste, high humidity, and ammonia-phosphate fertilizers used in agriculture. To strengthen the corrosion resistance of steel and the attractiveness of the metal surface, the quality of the relevant protective coatings must be improved (Saraswati et al, 2018).…”

Effectiveness of Red Dragon Fruit Peel Extract as an Eco-Friendly Corrosion Inhibitor for API 5L Steel

“…Corrosion cannot be stopped, but corrosion can be reduced and inhibited in various ways namely using corrosion inhibitors [7]. Cathodic protection [8], coating [9], and others. Recent developments have shown that the use of inhibitors is the most effective and efficient way to protect corrosion on metals [10].…”

Cyclic Oxidation Resistance of MoSi2 Added FeCrAlTiY Coatings on ST41 Steel at 700oC Prepared by a Flame Spraying Technique

“…It is well known that surface structure modification as surface hardening (Ismail and Taha, 2014) and coating deposition has been widely used to reduce part production costs (Luo et al, 2014), to improve wear resistance, hardness, or to act as environmental barrier coating (EBC) for critical components, resulting in higher oxidation or corrosion resistance (Singh et al, 2022). Thus, the selection of appropriate coating material and composition becomes particularly important (Saraswati, Nugroho, and Anwar, 2018). The FeCrAlY was receiving attractive attention for high-temperature oxidation and corrosion resistance applications because of the formation of a protective scale in the external layer (Wessel et al, 2004;Bennett and Bull, 1997).…”