Avtomaticheskaya Svarka (Automatic Welding), #2, 2020, pp.29-32
Corrosion resistance of composite material deposited by tig method using flexible cord Terocote 7888T
B.V. Stefaniv, L.I. Nyrkova, A.V. Larionov, S.O. Osadchuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.
Increasing the corrosion resistance of drill bits with protective coatings is an urgent problem in Ukraine. For drilling tool, the main indicators of physical and mechanical properties of wear-resistant coatings are abrasive wear, corrosion resistance and hardness (microhardness). It allows effectively resisting wear of working bodies of blades and a body of drill bits under the conditions of alternating and shock loads, hydroabrasive wear, corrosion, erosion, etc. It was investigated that a uniform distribution of tungsten carbide particles throughout the whole volume of deposited layer causes the same hardness over the coating depth and significantly increases the resistance of coating to corrosion wear. It is shown that microhardness of the matrix of a composite material TeroCote 7888T based on NiCrBSi exceeds the microhardness of steel 30Kh by 2.2 times. According to the results of corrosion tests, it was established that the protection of steel 30Kh by a deposited layer on the basis of a composite material TeroCote 7888T under the conditions simulating operating ones allows reducing the corrosion rate of working bodies of steel drill bit by almost 53 times. 10 Ref., 1 Tabl., 4 Fig.
Keywords: surfacing, tungsten carbides, microstructure, microhardness, wear resistance, corrosion rate, corrosion spot
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