Couple of high strength and flexible surface tolerant coatings were designed for oil contaminated, rusty, and minimally prepared steel surfaces. These coatings are to have strong interfacial adhesion due to low surface tension and sustain more than 5 MPa pull out force consistently. The effect of optimized concentration of zinc dust and micaceous iron oxide (MIO) as pigments is evaluated for these surface tolerant coating systems. It has been noticed that the presence of these two ingredients has enhanced corrosion resistance more than several times as compared to commercially available coating systems. The corrosion simulation test in 3.5 wt.% NaCl has evident for significant improvement in terms of delaying blistering and delamination. The high pore resistance (Rp) indicates the slow migration of ions and water into the substrate and coating interface, which could be the reason of the improvement in corrosion process.
Investigation
of the kinetics of the ion exchange between protonated
ultrastable Y-type (USHY) and surrogate electrorefiner (ER) waste
salt was performed to optimize the dechlorination process. The kinetics
of the ion exchange reaction was investigated by measuring the amount
of unreacted Cl. In theory, the kinetics of the ion exchange reaction
in porous media will be limited by diffusion- or reaction-controlled
mechanisms. Therefore, second order kinetics and diffusion-limited
rate models have been derived and compared to experimental data to
elucidate the rate-limiting step and develop a predictive model for
the apparent rate of reaction. Ion exchange experiments were performed
with varying zeolite particle sizes (up to 600 μm) at 625 °C.
The experiments were performed with both unfluidized and continuously
fluidized zeolite particles in static and rotating tube furnaces.
It was concluded that the process is limited by reaction kinetics
inside the zeolite crystals, and a second order kinetic model best
fits the experimental data. Given that the zeolite is not stable at
higher temperatures, further increase in the extent of dechlorination
for a given batch reaction time requires an increase of the zeolite-to-salt
ratio, which has the undesirable effect of increasing the volume of
generated waste per amount of salt.
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