Abstract
Waterborne silicate composite coatings were prepared to replace existing solvent-based coatings for ships. A series of complex coatings were prepared by adding anticorrosive pigments to the silicate resin. Adhesion, pencil hardness, and impact resistance were investigated, and corrosion performance in 3.5% NaCl solution was measured by electrochemical impedance spectroscopy (EIS). The results show that adhesion and impact resistance are high, and that pencil hardness can reach 4H. The curing mechanism for the coatings were investigated by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The mechanism of curing reaction in the studied waterborne silicate paint was found to be different from that reported in the literature. When the coatings were immersed in 3.5% NaCl solution for 8 h, there is only one time constant in the Bode plot, and coating capacitance (Qc) gradually increases while coating resistance (Rc) gradually decreases. Glass flake composite coatings have better corrosion resistance by comprehensive comparison of Qc and Rc.
Highlights
While ship corrosion in the ocean is inevitable, the corrosion rate can be controlled
Cathodic protection can be achieved by replacing iron corrosion with a metal that is more active than iron
Composite calcium zinc phosphate, titanium dioxide, micaceous iron oxide (MIO), and glass flake (GF) were obtained from Dalian Keli Ultrafine Powder Co., Ltd. (China), Wuhan Modern Technologies Institute (China), Shanghai Hongyunyuan Chemical Co., Ltd. (China), Changzhou Lehuan Trading Co., Ltd. (China), and Hebei Quanbao Anticorrosive Material Co., Ltd
Summary
While ship corrosion in the ocean is inevitable, the corrosion rate can be controlled. Waterborne silicate coatings possess excellent adhesion and environmental performance, they possess disadvantages such as poor water resistance and mechanical properties [19,22,23,24,25,26]. These disadvantages can be improved by means of acid modification, organic–inorganic hybridization, and nano-modification [27]. Flake anticorrosive pigments, such as micaceous iron oxide (MIO) and glass flake (GF), have been widely used to enhance the corrosion resistance for coatings [28,29,30,31]. This paper will be focused on the influence of GF and MIO on electrochemical corrosion performance of waterborne silicate coatings in 3.5% NaCl
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