The Effect of the Corrosion Medium on Silane Coatings Deposited on Titanium Grade 2 and Titanium Alloy Ti13Nb13Zr

The present paper focuses on the fabrication of coatings based on vinyltrimethoxysilane and the influence of various corrosion media on the coatings produced. Coatings were deposited on two substrate materials, namely, titanium Grade 2 and titanium alloy Ti13Nb13Zr, by immersion in a solution containing vinyltrimethoxysilane, anhydrous ethyl alcohol, acetic acid and distilled water. The obtained coatings were characterized in terms of surface morphology, adhesion to the substrate and corrosion resistance. As corrosion solutions, four different simulated physiological fluids, which differed in the contents of individual ions, and a 1 mol dm−3 NaBr solution were used. The chloride ions contained in the simulated physiological fluids did not lead to pitting corrosion of titanium Grade 2 and titanium alloy Ti13Nb13Zr. This investigation shows that titanium undergoes pitting corrosion in a bromide ion medium. It is demonstrated that the investigated coatings slow down corrosion processes in all corrosion media examined.

IMPROVEMENT OF ETHYL ALCOHOL BIOSYNTHESIS WHEN FERRYING APPLE WORT, OBTAINED ON THE BASIS OF INNOVATIVE SOLUTIONS FOR PROCESSING SECONDARY RAW MATERIALS

The article studies the effect of introducing an intermediate fraction of fruit distillate into the wort sent for fermentation in order to prevent the development of extraneous microflora, activate the fermentation process and reduce the loss of anhydrous ethyl alcohol in the production cycle of fruit distillates. The optimal technological modes of apple wort fermentation have been established.

Evaluation of the diesel engine feed by unified battlefield fuel F-34/F-35 mixed with biocomponents

The problem of the military vehicles engines fuelling increases with the growth of the amount of vehicles in the armies. At the same time, another problem with fuel supply in modern engines is the use of bio component additives, which changes characteristics (quality) of the used fuels. Therefore, it is important to take actions to adapt engines to powering with fuels coming from renewable sources.The aim of the research was to evaluate the possibility of feeding the diesel engine (influence on the useful parameters and composi-tion) with mixtures of the unified battlefield fuel F-34/F-35 with biocomponents in the form of anhydrous ethyl alcohol and RME. The tests were conducted during fuelling of the engine with six kinds of fuels: basic fuel (diesel oil), NATO code F-34/F-35 fuel, as well as fuel mixtures: F-34 and RME with different ratio and F-34/F-35 with bioethanol. In the result of the research it was concluded that the parameters of the G9T Renault engine with the common rail fuel system in terms of F-34 and RME consumption (using) decreased in comparison to diesel oil basic fuel. It is not possible to supply the engine with the mixture of ethyl alcohol and F-34 fuel – alcohol pre-cipitation and obliteration of fuel system components

Design of a Dehydration Tower for the Obtaining of Alcohol Anhídro

The design of a dehydration tower was carried out in order to obtain anhydrous ethyl alcohol of high degree of purity by adsorption with molecular sieves, for which, we proceeded to identify the process variables by laboratory tests varying the temperature and pressure in the feeding to the molecular sieve, with these data and the flow of feeding proceeded with the design of the dehydrator, determining the variables of the equipment (diameter, volume, internal bed, flow of feeding), as well as additional devices such as a preheater that works with a temperature of 120 ºC, which is essential to increase the enthalpy of the steam, and a condenser fed with water at a temperature of 25 ºC, which makes it possible to transform the anhydrous alcohol from vapor to liquid, having a yield of 86.6% and an efficiency of 92,9%, values that help to have an alcohol of 99,5% by weight in a time of 20 minutes.