Abstract

A 0.45 wt% C steel was modified by pulsed high energy density plasma (PHEDP), which was composed of particles of aluminum and nitrogen. A layer of thin film was formed on it. The modified steels were studied by an electrochemical corrosion test and transmission electron microscope (TEM) observations. Results showed that the corrosion resistance ability of 0.45 wt% C steel improved after modification, and the film was composed of nanocrystal-aluminum-nitride-phase (AlN), with crystal size of less than 20 nm. The nanocrystal-structured film contributes to the improvement of the corrosion resistance. The improvement is not only related to the microstructure of the film but also to its surface morphology, and both are controlled by the parameters of the PHEDP.

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