Investigation on the origin and nature of the microstructural features related to corrosion initiation in titanium-aluminium nitride coated steel

Helena Ronkainen, Ulla Ehrnsten, Riitta Zilliacus, Jaakko Saarilahti, Amar Mahiout, Simo-Pekka Hannula

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

In this work the microstructural features and defects identified previously in corrosion and porosity tests of the coatings were studied. The influence of surface roughness was evaluated with (Ti, Al)N coatings on two different types of substrates. Coatings deposited on the roughest surfaces on either a high speed steel or a stainless steel had the highest porosity.
However, the dependence of the porosity on the surface roughness was not straightforward. Interrupted coating runs were carried out to obtain more information on the initiation of defects in the substrate-coating interface. Samples produced in the interrupted runs were analysed using metallographic methods, scanning electron microscopy with X-ray analysis, Rutherford backscattering spectrometry and secondary ion mass spectroscopy.
Sputtering was found to be effective in removing the impurities from the interface and none of the non-metallic elements (carbon, oxygen, sulphur) studied exhibited any enrichment on the interface.
The use of a tungsten filament for enhancement of the plasma was found to result in a tungsten-enriched layer at the substrate-coating interface, which may have an effect on adhesion and corrosion properties of the coating.
However, no droplet types of formations were detected after sputter cleaning or when either titanium or aluminium evaporation was started, suggesting that tungsten was evenly distributed in the coating.

Original languageEnglish
Pages (from-to)160-165
Number of pages6
JournalThin Solid Films
Volume220
Issue number1-2
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

Fingerprint

Aluminum nitride
titanium nitrides
Steel
aluminum nitrides
Titanium
corrosion
steels
Corrosion
coatings
Coatings
Tungsten
tungsten
porosity
coating
Porosity
surface roughness
corrosion tests
Substrates
Surface roughness
defects

Cite this

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title = "Investigation on the origin and nature of the microstructural features related to corrosion initiation in titanium-aluminium nitride coated steel",
abstract = "In this work the microstructural features and defects identified previously in corrosion and porosity tests of the coatings were studied. The influence of surface roughness was evaluated with (Ti, Al)N coatings on two different types of substrates. Coatings deposited on the roughest surfaces on either a high speed steel or a stainless steel had the highest porosity. However, the dependence of the porosity on the surface roughness was not straightforward. Interrupted coating runs were carried out to obtain more information on the initiation of defects in the substrate-coating interface. Samples produced in the interrupted runs were analysed using metallographic methods, scanning electron microscopy with X-ray analysis, Rutherford backscattering spectrometry and secondary ion mass spectroscopy. Sputtering was found to be effective in removing the impurities from the interface and none of the non-metallic elements (carbon, oxygen, sulphur) studied exhibited any enrichment on the interface. The use of a tungsten filament for enhancement of the plasma was found to result in a tungsten-enriched layer at the substrate-coating interface, which may have an effect on adhesion and corrosion properties of the coating. However, no droplet types of formations were detected after sputter cleaning or when either titanium or aluminium evaporation was started, suggesting that tungsten was evenly distributed in the coating.",
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Investigation on the origin and nature of the microstructural features related to corrosion initiation in titanium-aluminium nitride coated steel. / Ronkainen, Helena; Ehrnsten, Ulla; Zilliacus, Riitta; Saarilahti, Jaakko; Mahiout, Amar; Hannula, Simo-Pekka.

In: Thin Solid Films, Vol. 220, No. 1-2, 1992, p. 160-165.

Research output: Contribution to journalArticleScientificpeer-review

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