Plasma Electrolytic Oxide (PEO) Coatings are hard, dense, wear-resistant, and well-adhered oxide coatings for metals such as aluminum and magnesium. The process by which they are grown may also be referred to as micro-arc oxidation (MAO) or spark discharge anodizing. Essentially, it involves the modification of a conventional anodically grown oxide film by the application of an electric field greater than the dielectric breakdown field for the oxide. Discharges occur, and the resulting plasma-chemical reactions contribute to the growth of the coating. Rapid cooling also modifies the oxide, resulting in a complex mixture of amorphous material and nanocrystalline phases.
The deposition of protective phosphate coatings was carried out from solutions based on the preparation “Majef”, consisting of manganese and iron phosphates. To obtain phosphate films of white color, it is proposed to introduce zinc and calcium nitrates into phosphating solutions at the rate of 25–30 g/L. The surface of phosphate coatings was studied using […]
In a hydrothermal synthesis process, a non-crystalline aluminum silicate similar to the clay mineral allophane was created. This synthetic mineral was subsequently incorporated as a nanofiller into both clear and multicolored aqueous emulsion paints. Analysis through X-ray diffraction confirmed the nanofiller’s amorphous structure, displaying a narrow particle size distribution with an average diameter of 1.2 […]
Weak bonding between coatings and substrates can result in the failure of components subjected to high-temperature fatigue leading to substantial economic losses and lower production efficiency. Coating spalling is typical in applications where large alternating thermal cycles are present. Thus, tight bonding between coating and substrate is critical to avoid thermal failure at high temperatures. […]