The electrodeposition of Zn-SiO 2 nanocomposites has been investigated with different electrolytes: triethanolamine as a dispersing agent, and cetyl trimethylammonium bromide and dodecyl dimethylamine oxide as ionic (cationic) and non-ionic surfactants. Appropriate electrophoretic potentials for each solution were obtained using cyclic voltammetry. The results show that the most stable SiO 2 nanoparticles with zeta potential range of 25 to 41 mV, alongwith highest SiO 2 mobility of 0.4 to 0.7 m 2 /V.s were dispersed by triethanolamine in ethanol and the resulting coating adhesion improved up to 5.87 MPa in the standard pull off test, with the enhanced hardness of up to 800 HV. The coating thickness has been seen to increase with increasing potential. The coating morphology investigations reveal three different morphologies for different electrolytes: instantaneous coaxial grain growth for water, hexagonal grain growth for methanol and amorphous structure for ethanol. Corrosion properties of the zinc nanocomposite coatings are discussed where samples with low SiO 2 (<10 wt.%) concentrations are shown to possess higher corrosion resistance than high SiO 2 (>10 wt.%) concentrations.In the last 20 years the interest in electrophoretic deposition (EPD) as a technique to produce advanced materials has widely increased, both in academia and in the industrial sector, and since then a wide range of new applications of EPD for processing a variety of bulk materials and coatings has been reported.
Further to traditional corrosion monitoring techniques for rated deteriorations, nowadays modern electrochemical monitoring methods are promising for the control of non-rated damage mechanisms. Considering carbon steel as the most commonly used alloy in the oil and gas industry, there are special grades under NACE MR0175 standard which are immune to sour corrosion. However, according to the industry reports, their immunity can be terminated by upset conditions or on site repairs. This issue will impose either a high operational risk or exorbitant maintenance and inspection costs. Hence, in this paper, a new monitoring technology framework is discussed to lessen a catastrophic failure risk for carbon steel under wet H 2 S corrosion. In this regard, the application of a developed hybridized ZnO-graphene micro-electrode (ZnOG) with a mix band gap of 1.17 eV is studied. Under hydrogen sulfide attack and when ZnOG hybrids are excited by UV illumination, their photoelectrochemical responses are analyzed. ZnOG hybrids emanate informative impedance signals in a response to the formation of ZnO (1x) S x nano-crystals.
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