PROTECTION AGAINST CORROSION OF AGRICULTURAL MACHINERY WITH CONSERVATION MATERIALS FROM VEGETABLE RAW MATERIALS
Problems of corrosion protection of agricultural machinery during its temporary non-use are extremely important. For their solution it is proposed to use vegetative raw materials available for the farmer as they are characterized by rapid renewability and environmental purity. The purpose of this paper was to study the protection of carbon steel from atmospheric corrosion with films based on rapeseed and sunflower oils and their production waste containing higher carboxylic acid and a mixture of higher carboxylic acids with phospholipids. For the research we employed methods of potentiodynamic polarization, impedance spectroscopy, linear polarization resistance, corrosion gravimetric in salt solutions and thermal moisture chamberG-4. The study of physical and chemical properties, rheological properties of vegetable oils and their production waste showed that the waste products of vegetable oils, as well as oils, were colloidal systems, the particle size of which increases with decreasing temperature. The tested environmentally friendly compositions are quite technologically advanced as they are characterized by small thickness (20 - 30 mm) and are easily applied to the surface at a temperature of 20 - 25 ° C with a sufficiently high protective efficiency (more than 80% after 6 months of exposure to open air). The films from rapeseed oil in sulfate medium effectively protect carbon steel better than those made from sunflower oil; they can be used to calculate comparable protective efficacy of their production waste. Compositions based on rapeseed oil with additive wastes were more effective in protecting the metal surface against atmospheric corrosion than that based on sunflower oil.