Quality Surface Analysis for Polarized Grid Plasma Nitridings Journal title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor Authors: Mihai AXINTE, Manuela-Cristina PERJU, Carmen NEJNERU, Ion HOPULELE, Iulian CIMPOEŞU Subject(s):