Growth of AlN coating on Al-6061 alloy surface

Soni, Rohan; Sarin, Vinod K.; Rao, Pratima; Srinivasan, Easwar; Basu, Soumendra N.

doi:10.1016/j.surfcoat.2023.130254

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Also worth mentioning are some interesting model studies [25] showing the possibility of creating layers based on aluminum nitride with a thickness of approximately 400 µm under the reduced pressure of a nitrogen atmosphere and in the presence of magnesium powder. Other studies showing the effectiveness of similar solutions were recently reported [26]. The beneficial effect of magnesium as an alloying element in an aluminum substrate on the kinetics of nitriding under glow discharge conditions was also earlier described [5,9].…”

Section: Aluminum Nitriding-state Of the Artmentioning

confidence: 61%

Diffusion Nitride Surface Layers on Aluminum Substrates Produced by Hybrid Method Using Gas Nitriding

Tacikowski,

Słoma,

Jakieła

et al. 2024

Metals

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While gas nitriding of steel is currently used in industry, nitriding of aluminum alloys remains an open challenge. The main obstacle is aluminum’s high susceptibility to passivation. The oxide film provides an effective barrier to nitrogen diffusion. Attempts to overcome this problem have mainly focused on glow discharge nitriding using cathode sputtering of an oxide layer. The produced AlN layers exhibit no diffusion zone and show limited performance properties. In this work, the effect of hybrid treatment aimed at producing diffusion layers of nitrides other than AlN on aluminum alloys was investigated on the model system of iron nitride–aluminum substrate. Hybrid treatment combines an electrochemical process involving the removal of the aluminum oxide layer from the substrate, its subsequent iron plating, and a further gas nitriding in high-purity ammonia. The obtained results prove that the hybrid treatment allows the production, at 530 °C/10 h, of diffusion layers of Fe3N iron nitrides on aluminum substrates with a nitrogen diffusion zone range in aluminum of ca. 12 µm. In alloys containing magnesium, its unfavorable effect on the nitrogen diffusion and the functional properties of the layers was observed. An interesting direction for further research is hybrid treatment of precipitation-hardened alloys without magnesium.

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