PSI - Issue 20

Borisova M.Z. et al. / Procedia Structural Integrity 20 (2019) 48–52 Borisova M.Z. et al. / StructuralIntegrity Procedia 00 (2019) 000 – 000

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Fig. 3. SEM morphology of the coating obtained by wire arc metallization and element maps showing Fe, O, Cr and Al zonation in it.

The corundum content in the coatings obtained under different modes of arc metallization was also evaluated (Fig. 4). To calculation data on the content of corundum inclusions, a micro-x-ray spectral analysis of gas-thermal coatings was carried out, which revealed the Al content on the sample section.

Fig. 4. SEM micrograph of the coatings produced by the 1-st (a), 2-nd (b) and 3-rd (c) spraying modes.

A slight decrease in the proportion of corundum in the metallized coating is most likely due to the burnout of the alloying elements with an increase in the arc temperature with an increase in the current strength (Fig. 5).

Fig. 5. Content of the corundum (Al 2 O 3 ) at coatings produced by the 1-st (a), 2-nd (b) and 3-rd (c) spraying modes.