"two coatings" is correct and usable in written English.
You can use it when referring to an object that has two layers or coatings, for example: "This paint is designed to be applied in two coatings for optimal coverage."
The microstructural differences between the two coatings in the as-coated condition were investigated and the development of their microstructure during heat treatment was described.
In this work we studied details of the combination of two coatings, one a solid lubricant (WC/C) coating sputtered onto a hard, wear- and temperature-resistant (TiAlN) coating, deposited onto high-speed steel and cemented carbide substrates.
So, the ablation resistance of HfC-ZrC coating was worse than the other two coatings.
The panels with PF multicore microcapsules showed even better corrosion protection as compared to the other two coatings with most of the cracks in the coating being healed as well as prevented from the corrosion formation in the scribed line region (Figure 7c).
The work demonstrated that all the coated materials to be very much more resistant to material loss through corrosion wear (by nearly an order of magnitude) compared to uncoated stainless steel, and two coatings, W 13%B and W 23%B coated Ortron 90 were similarly resistant as CrN coated Ti 6Al 4V.
Two coatings were investigated: a relatively thick (3.7 μm) coating deposited using a low voltage electron beam system, and a thinner (0.7 μm) coating deposited using a cathodic arc process.
The friction and wear behaviors of cylinders with these two coatings were compared with those of the cylinder without coating under bio-oil lubricated conditions.
Combining the two coatings, i.e., applying a 640 nm Co coating on top of the 10 nm Ce, effectively reduces Cr evaporation and slows down the rate of alloy oxidation.
It can be observed that the potentiodynamic potentials of the two coatings are below 316 steel, and micro-nano WC-10Co4Cr coating possesses a higher value than the conventional one.
The results indicate that the thickest coating of 15 μm can be obtained by adopting the highest frequency pulsed DC, i.e., 4000 Hz and the coating has almost the same surface roughness as other two coatings.
The Valspar Corporation and Lilly Industries, two coatings companies, are awaiting regulatory approval to merge.
