RESEARCH OF CORROSION RESISTANCE OF COATINGS OBTAINED BY THE METHOD OF GAS DYNAMIC SPUTTER

Currently, almost all automotive vehicles use parts made of aluminum alloys. The world auto industry consumes from 4.5 to 5.0 million tons of aluminum alloys per year, which is about 20% of world aluminum production. Low density, high mechanical strength, corrosion resistance, good machinability and a number of other properties caused the use of aluminum alloys for the manufacture of critical parts of the internal combustion engine, as well as the use of aluminum powder materials in restoring defective automotive parts. The purpose of this work was to study the corrosion resistance of coatings obtained by the method of gas dynamic spraying using standard and electroerosive powder materials. Currently, one of the most promising methods for applying coatings is gas dynamic spraying. One of the problems of using the technology of gas-dynamic spraying is the quality of the used powder materials. One of the most promising and industrially not used are powder materials (PM), obtained from conductive waste by electroerosion dispersion. However, these materials have not been used to date in the technology of restoring defective parts of cars by gas-dynamic spraying, including the cylinder heads. Testing the corrosion resistance of gas-dynamic coatings was carried out according to the method of accelerated testing using the multichannel potentiostat-galvanostat “Elins P-20X8”. Potentsiostat - galvanostat R- 20X8 is entered  in the State Register of Measuring Instruments of the Russian Federation (State Register of SI of the Russian Federation) under registration number 70702-18. The method of calibration MP 206.1-001-2018, the verification interval is 2 years. The device is also certified according to the GOST R certification system. Certificate of Conformity No. ROSS RU.AD44.N04368. As a result of the study of the corrosion resistance of coatings, it was experimentally established that in coatings obtained using standard PM, the electrolyte penetrates the coating, respectively, the coating obtained using EDM PM is more resistant to corrosion and less susceptible to flaking.

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