CeO 2 modified graphene nanoplatelets composite powders enhanced the cathodic protection of waterborne zinc-rich epoxy c
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ORIGINAL PAPER
CeO2 modified graphene nanoplatelets composite powders enhanced the cathodic protection of waterborne zinc‑rich epoxy coatings Chunyu Wang1 · Zhaohui Qin1 · Kang Feng1 · Bo Zhong1 Received: 17 June 2020 / Accepted: 2 November 2020 © The Polymer Society, Taipei 2020
Abstract In this work, the C eO2 particles were loaded on the graphene nanosheets (GNPs) by the one-step hydrothermal method. Then the CeO2-GNPs composite was introduced into the waterborne zinc-rich epoxy (ZRE) coatings as a nanofiller. The morphology and structure of CeO2-GNPs were characterized by XRD, Raman, SEM, TEM, XPS. And the anti-corrosion properties of the CeO2-GNPs /ZRE coatings were investigated by EIS and polarization curves analysis. The results showed that the C eO2 particles with an average diameter of about 140 nm were uniformly distributed on the GNPs. The cathodic protection and permeability resistance of the CeO2-GNPs /ZRE coatings were enhanced significantly due to the excellent dispersivity of the CeO2-GNPs. This work provides a feasible/suitable way for the preparation of the CeO2-GNPs material and has broad application prospects in the field of metal protection. Keywords Modified graphene nanosheets · CeO2 · Coatings · Anticorrosion
Introduction Zinc-rich epoxy (ZRE) coatings have been utilized widely to protect the carbon steel against corrosion [1]. In the ZRE coatings, the protective mechanism is based on zinc particles which provide cathodic protection of the carbon steel via the sacrificial anodic dissolution [2]. Then the barrier protection of the coating is provided by the corrosion products of zinc powder, which are formed by filling the pores of the ZRE coating [3]. The mechanism of corrosion protection for ZRE coatings is affected by the value of pigment volume concentration (PVC). When the PVC value in the ZRE coatings exceeds 60, the good electrical contact between zinc particles and the carbon steel substrate will be obtained and the cathodic protection will become the dominant protection mechanism of the ZRE coatings [4]. Nevertheless, as time goes by, the electrical contact between the zinc particles and the carbon steel substrate rapidly decreases due * Chunyu Wang [email protected] * Bo Zhong [email protected] 1
School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), 264209 Heilongjiang, People’s Republic of China
to the rapid oxidation of zinc particles. It was reported that even if the zinc content reaches 90wt.%, it can not guarantee the cathodic protection under long-term exposure. [5], meantime, a large number of zinc particles will increase the porosity and weight of the coating, but also attenuate/waken its adhesion force to the steel substrate [6]. In addition to polymers as effective corrosion inhibitors for steel [7–9], attempts have been performed to enhance the cathodic protection of ZRE coatings by introducing different types of conductive filler, such as carbon nanotubes [10], polyaniline [11], Al [12], etc., which will serve as electric
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