Synthesis and characterization of the novel nano composite pigments using CoWO4 on different silica sources: A comparative study

• Published in: Powder technology 2020-03, Vol.363, p.86-94
• Main Authors: Rostampour, Mina, Eavani, Sara
• Format: Article
• Language: English
• Subjects: Anticorrosive pigment; Calcium silicate; Cobalt tungstate; Color; Comparative studies; Composite materials; Corrosion prevention; Electrochemical impedance spectroscopy; Electrochemistry; Emission analysis; Inductively coupled plasma; Nano silica; Pigments; Rice husk ash; Silica; Silicon dioxide; Sodium chloride; Spectroscopy; Spectrum analysis
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2020.01.031

This study aims to introduce a series of eco-friendly anticorrosive nano composite pigments consist of CoWO4 (CoW) as a colorant and different silica sources including CaSiO3, rice husk ash and nano silica as an inexpensive matrix. The synthesized samples were characterized by XRD, FESEM-EDX, ICP-AES, UV–Vis-NIR diffuse reflectance spectroscopy, and CIE L*a*b* color scales. The new pigments comprising about 90 wt% of silica sources covered with a thin layer of CoW that is about 10 wt% of pigment. These pigments were used in epoxy based paint formulation and their corrosion efficiencies were investigated using electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. The results showed that the color and anticorrosive properties of the nano composite pigments were significant differences with the changing of silica source. [Display omitted] •A series of novel CoWO4-based composite pigments was synthesized.•All the CIE color coordinates are located in the blue region.•The corrosion efficiencies were investigated using electrochemical impedance spectroscopy.