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Plasma Nitriding and DLC Coatings for Corrosion Protection of Precipitation Hardening Stainless Steel
Author(s) -
Dalibón Eugenia L.,
Guitar María Agustina,
TravaAiroldi Vladimir,
Mücklich Frank,
Brühl Sonia P.
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500411
Subject(s) - materials science , nitriding , corrosion , metallurgy , polarization (electrochemistry) , hardening (computing) , salt spray test , pitting corrosion , precipitation , precipitation hardening , composite material , microstructure , layer (electronics) , chemistry , physics , meteorology
A duplex treatment, combining a nitriding diffusion process and the deposition of DLC coatings is investigated as an option for corrosion protection of precipitation hardening steels, in order to increase the service life of components used in plastic injection molds. Hardness and mechanical resistance are determined and the corrosion resistance in two different media is analyzed. Non‐coated nitrided and non‐nitrided samples are also tested for comparison. Corrosion resistance is investigated by means of immersion, salt spray, and polarization tests. No signs of atmospheric corrosion are observed after the salt spray test and in acid media, the nitrided samples, with and without DLC, present the lowest mass loss. The duplex sample shows the best corrosion behavior in the electrochemical tests.