Journal
COATINGS
Volume 9, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/coatings9080511
Keywords
PVD hard coatings; growth defects; pinhole; focused ion beam; pitting corrosion
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Funding
- Slovenian Research Agency [P2-0082]
- European Regional Development Funds [OP13.1.1.2.02.006]
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In this work, the causes of porosity of TiAlN hard coatings sputter deposited on D2 tool steel were studied since its corrosion resistance is mainly affected by imperfections within the coating (e.g., pinholes, pores, crevices). The corrosion test was performed in a chlorine solution using electrochemical impedance spectroscopy. The coating morphology of growth defects before and after the exposure was studied by scanning electron microscopy (SEM), while focused ion beam (FIB) was used to make series of cross-sections through individual selected defects. We confirm that pitting corrosion is closely related to the through-thickness growth defects. It was also found that in the case of nodular defects, the intensity of corrosion depends on the shape of the seed.
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