Influence of the composition of aluminum coatings and its alloys on the quality of car bodies corrosion protection.
Students Name: Vitiv Markiian Bohdanovych
Qualification Level: magister
Speciality: Motor Vehicle Transport
Institute: Institute of Mechanical Engineering and Transport
Mode of Study: full
Academic Year: 2021-2022 н.р.
Language of Defence: ukrainian
Abstract: Corrosion - the main type of wear of the metal body. In metal parts of the body is the most common electrochemical type of corrosion, in which the metal interacts with a solution of electrolyte adsorbed from the air, and which occurs as a direct hit of moisture on unprotected metal surfaces of the body and as a result of condensation in its intercladding space internal and external panels of doors, boards, roof, etc.). Corrosion is especially strong in places that are difficult to inspect and clean in small gaps, as well as in flanging and bending edges, where moisture periodically enters them can be stored for a long time [1]. Thus, dirt, salt and moisture can accumulate in the wheel arches, stimulating the process of corrosion; the bottom of the body is not sufficiently resistant to corrosive factors. The rate of corrosion is greatly influenced by the composition of the atmosphere, its pollution by various impurities (emissions of industrial enterprises, such as sulfur dioxide formed by fuel combustion; ammonium chloride entering the atmosphere due to evaporation of seas and oceans; particulate matter in the form of dust) , as well as ambient temperature, etc. Solid particles contained in the atmosphere or falling on the surface of the body from the road surface, also cause abrasive wear of the metal surface of the body. With increasing temperature, the corrosion rate increases (especially in the presence of aggressive impurities in the atmosphere and moisture content). Winter road coverings with salt to remove snow and ice, as well as the operation of the car on the coast lead to increased corrosion of the car. Corrosion damage in the body also occurs as a result of contact of steel parts with parts made of certain other materials (duralumin, rubbers containing sulfur compounds, plastic based on phenolic resins and others, as well as as a result of metal contact with parts made of very moist lumber containing a significant amount of organic acids (formic, etc.) [2]. The object of research is design solutions and technological methods of processing of elements of car bodies which provide high anticorrosive properties in concrete conditions of work of cars. The subject of research - the elements of the bodies of modern cars. The purpose and objectives of the study. Develop a combined protective coating of a tread electrometallization layer based on aluminum alloy and a final penetration conductive layer to increase the durability of car bodies and their elements. To achieve this goal, the following tasks should be solved: 1. Identify places in the design of car bodies that are most prone to corrosion. 2. Select the equipment of electric arc spraying and methods for determining the physical characteristics of the sprayed surface and penetration layer. 3. Choose the thickness of the sprayed coating. 4. Choose the composition of penetration and protective coatings, as well as the thickness of the sprayed tread. The main results. When operating cars, there are two main groups of damage and malfunctions: damage that occurs as a result of increasing changes in the condition of the body. These include natural wear and tear, which occurs during the normal technical operation of the car, due to constant or periodic exposure to the body of such factors as corrosion, friction, decay of wooden parts, elastic and plastic deformations, etc. It is established that the most effective way to protect the bottoms of the car from atmospheric corrosion is a combined protection, which consists in applying an electric arc tread coating of AMG-6 wire, followed by application of antistatic epoxy layer with conductive filler. For effective protection against atmospheric corrosion of the car bottom, the minimum thickness of the electric arc coating made of aluminum wire AMG-6 should be at least 50-60 microns. 1 Головинский А.Г. Experience of application of electrometallization and combined anticorrosive coverings / A.G. Головинский, Ю.Н. Krivosheev // Chemical engineering. - 2002. - №6. - P. 9 - 12. 2 Manyakhina TI The current state of protection of machines against corrosion. Review information / T.I. Маняхина, А.М. Efimova, E. Ya. Lublinsky // Corrosion control and environmental protection. - 1989. - Issue. 3 (55). - 123 p.