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Mechanical Behavior of Nitrocarburised Austenitic Steel Coated with N-DLC by Means of DC and Pulsed Glow Discharge

Borowski Tomasz, Kulikowski Krzysztof, Spychalski Maciej, Rożniatowski Krzysztof, Rajchel B., Adamczyk-Cieślak Bogusława, Wierzchoń Tadeusz

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 1

317--324

AISI 316L steel was subjected to nitrocarburizing under glow discharge conditions, which was followed by DLC (diamond-like carbon) coatings deposition using the same device. The coatings were applied under conditions of direct current and pulsed glow discharge. In order to determine the influence of the produced nitrocarbon austenite layer and the type of discharge on the microstructure and mechanical properties of the coatings, the following features were analysed: surface roughness, coating thickness, structure, chemical composition, adhesion and resistance to frictional wear. For comparison purposes, DLC coatings were also deposited on steel without a nitrocarburised layer. The obtained results indicate a significant influence of the type of glow discharge on the roughness, hardness, nitrogen content and of the nitrocarburised layer on the resistance to wear by friction and adhesion of the produced coatings.

A critical review of corrosion rate calculations of Mg-Al-Li alloys using traditional mass loss measurements

Dobkowska Anna, Adamczyk-Cieślak Bogusława, Mizera Jarosław

Ochrona przed Korozją

2020

nr 2

38--41

The corrosion rate (CR) calculations were performed for AZ31, AZ31-4Li, AZ31-7.5Li and AZ31-15Li Mg alloys after extrusion, and after extrusion with subsequent heat treatment. CR was obtained using three different mass loss (ML) measurements: i) traditional ML measurements where weighing before and after immersion was being implied, ii) by atomic absorption spectroscopy, where number of Mg2+ ions were calculated from the solution after immersion, and iii) by ML measurements in an artificial atmosphere. As results show, there are many differences in CR results obtained by these techniques. When CR is being calculated for multi-alloying materials, all possible anodic reactions which can take place during dissolution of immersed samples in the solution, should be considered.

W pracy porównano szybkość korozji mierzoną trzema różnymi metodami dla stopów Mg-Li-Al. Szybkość korozji została obliczona w oparciu o i) grawimetryczne pomiary ubytku masy po zanurzeniu w roztworze, ii) analizę stężenia jonów Mg2+ w roztworze po zanurzenie próbek, iii) na podstawie pomiarów ubytku masy po ekspozycji próbek w komorze solnej. Na podstawie wykonanych pomiarów wskazano wady i zalety metod służących do oceny szybkości korozji stopów magnezu zawierających różne dodatki stopowe, w tym Al i Li. Wykazano, że dobór metody służącej do oceny szybkości korozji wieloskładnikowych stopów magnezu jest ściśle uzależniony od rodzaju i ilości reakcji anodowych zachodzących w trakcie ekspozycji materiału w środowisku korozyjnym.