Research of corrosion fracture of D16t and AMg6 aluminum alloys exposed to microscopic fungi

This paper presents an experimental study of biocorrosion of D16T and AMg6 aluminum alloys. The determining role of reactive oxygen species in aluminum biocorrosion by a consortium of molds has been shown. A model is proposed, according to which the initiators of corrosion damage to the metal surface are superoxide anion radical and hydrogen peroxide released during the life of micromycetes. It is assumed that the initiation and development of biocorrosion occurs, among other things, as a result of the process of reductive activation of oxygen and the Fenton decomposition of hydrogen peroxide. A conclusion is made about the mechanism of the occurrence of intergranular and pitting corrosion of aluminum alloys interacting with microscopic fungi.

Isolated boron in zeolite for oxidative dehydrogenation of propane

Oxidative dehydrogenation of propane (ODHP) is a key technology for producing propene from shale gas, but conventional metal oxide catalysts are prone to overoxidation to form valueless COx. Boron-based catalysts were recently found to be selective for this reaction, and B–O–B oligomers are generally regarded as active centers. We show here that the isolated boron in a zeolite framework without such oligomers exhibits high activity and selectivity for ODHP, which also hinders full hydrolysis for boron leaching in a humid atmosphere because of the B–O–SiOx linkage, achieving superior durability in a long-period test. Furthermore, we demonstrate an isolated boron with a –B[OH…O(H)–Si]2 structure in borosilicate zeolite as the active center, which enables the activation of oxygen and a carbon–hydrogen bond to catalyze the ODHP.