Phosphating Modification with Metal Ions of Carbon Steel Surface to Improve the Influence of Anticorrosion Properties

Abstract

The purpose of this research is to investigate the influence of the phosphatizing process with Ni2+, Ce3+, and Ti2+ ions on the properties of the coating to obtain better corrosion protection of the metal. Steel corrosion occurs through physicochemical interaction between the metal and its surrounding environment. This leads to a change in the metal’s physical, mechanical, and optical properties that can cause damage to the functionality of the metal, which in turn may result in accidents or other malfunctions. Carbon steel grade has limited resistance to corrosion, depending on the carbon content and alloying element, the microstructure, and the surrounding environment of the material. This paper present tests that have been carried out on some of the physicochemical properties of protective epoxy and polyurethane coating on carbon steel grade. Coatings represent one of the methods available to protect metal surfaces from corrosion. Coating properties such as thickness, hardness, and adhesion were investigated. The same properties were tested by exposing the sample plates to corrosive conditions of the humid chamber and seawater. Their anticorrosion properties were explored by electrochemical impedance spectroscopy (EIS) techniques under immersion in 3.5 wt.% NaCl solutions as a corrosive medium. Part of the samples prior to application of the coatingwere modified with a phosphate solution containing metal ions: Ni2+, Ce3+, and Ti2+ to further investigate the effects of phosphatization on the properties of the coating. After exposure of the plates to the salt and moist chamber conditions, no traces of corrosion products, cracking or peeling of the coating were found on the surfaces. The adhesion properties were tested by the pull-off adhesion test. It was found that metal/polymer adhesion was satisfied according to EN ISO 4624:2016 and had the same value for all samples. However, a detailed EIS analysis showed a higher resistance of phosphate samples with Ce3+ ions than samples that were phosphated with Ni2+ and Ti2+ ions and those that did not have a sparingly soluble phosphate salt layer.

Polyurethane and rare-earth materials: a review

“…Yin et al, 2021;R. Yu et al, 2017) Cerium (Ce) (A. Saadat-Monfared & Mohseni, 2014;Anand & Sivaramakrishna, 2021;Baig & Khan, 2015;Bose et al, 2022;Ferrel-Álvarez et al, 2017;Fu et al, 2016;Huang et al, 2022;Jaganathan et al, 2022;Jorcin et al, 2010;Joshi et al, 2022;Mani et al, 2022;Martineau & Shek, 2006;Mastouri Mansourabad et al, 2020;Mo et al, 2019;Nguyen et al, 2021;Nhiem et al, 2018;Ni et al, 2021;Palma-Ramírez et al, 2017;G.-F. Pan et al, 2022;Roitti et al, 2004;Saadat-Monfared et al, 2012;Saha et al, 2019;Samardžija et al, 2022;Unnithan et al, 2014;Xavier, 2021;Xie et al, 2021;) Liu et al, 2019;Mendes-Felipe et al, 2021;Yao et al, 2021)…”

“…Among the other physicochemical properties of interest that were analyzed in the articles categorized here, thermal resistance also stands out, studied by Xie et al (2021), X. Yu et al (2021), Mani et al (2022) and Joshi et al (2022), and corrosion resistance, verified by Mo et al (2019), Ni et al (2021), Samardžija et al (2022) and Huang et al (2022). Hardness, hydrophobicity and anticoagulant capacity were identified in some papers, while other miscellaneous characteristics had lesser occurrence, such as regeneration capacity, resistance to water absorption and abrasion, antifreeze property and flame retardants.…”

Lignin Phosphate: A Biobased Substitute for Zinc Phosphate in Corrosion-Inhibiting Coatings

“…In industrial settings, epoxy-based coatings containing inhibitive pigments find application in protecting the metal structures of ships, , power plants, refineries, and chemical plants . Bisphenol-A (BPA) based epoxy coatings are the preferred option, offering robust corrosion resistance, adhesion, pigment wetting, and resilience against chemical and mechanical stresses .…”

Obtaining Red Phosphate Coatings on Steel at Room Temperature

“…The surface of the steel turns into a crystalline layer consisting of insoluble secondary and tertiary phosphates that adhere to the base metal and are an integral part of it [12][13][14]. The main advantages of phosphate films include good adhesion to the metal surface and high protective properties [15][16][17][18][19].…”